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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[CSHARP-750] Improve performance of serialization/deserialization of types serialized as BSON arrays</title>
                <link>https://jira.mongodb.org/browse/CSHARP-750</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;When serializing array of value types there is no need to lookup for serializer for every item, because it is homogeneous. This saves us some cpu cycles but most benefit may be achieved when multiple threads are doing serialization, like in my multi-threaded insert benchmark. The suggest fix allows to avoid extra-contention on ReaderWriterLockSlim inside BsonSerializer.&lt;/p&gt;

&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;					var serializer = BsonSerializer.LookupSerializer(typeof(T));&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;						serializer.Serialize(bsonWriter, typeof (T), item, options);&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment>Windows 7 Professional SP1 x64&lt;br/&gt;
.NET 4.0</environment>
        <key id="77938">CSHARP-750</key>
            <summary>Improve performance of serialization/deserialization of types serialized as BSON arrays</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="dnaumov">Dmitry Naumov</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Jun 2013 06:22:06 +0000</created>
                <updated>Sat, 27 Jul 2013 18:32:25 +0000</updated>
                            <resolved>Sat, 13 Jul 2013 00:19:48 +0000</resolved>
                                    <version>1.8.1</version>
                                    <fixVersion>1.8.2</fixVersion>
                                    <component>Performance</component>
                                        <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="376727" author="auto" created="Tue, 9 Jul 2013 00:54:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;rstam&apos;, u&apos;name&apos;: u&apos;rstam&apos;, u&apos;email&apos;: u&apos;robert@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-750&quot; title=&quot;Improve performance of serialization/deserialization of types serialized as BSON arrays&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-750&quot;&gt;&lt;del&gt;CSHARP-750&lt;/del&gt;&lt;/a&gt;: Added optimizations for ThreeDimensionalArraySerializer and TwoDimensionalArraySerializer.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/eb055575db6a1c05c9ff4784f883c2a9b88737f0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/eb055575db6a1c05c9ff4784f883c2a9b88737f0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="376726" author="auto" created="Tue, 9 Jul 2013 00:54:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;rstam&apos;, u&apos;name&apos;: u&apos;rstam&apos;, u&apos;email&apos;: u&apos;robert@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-750&quot; title=&quot;Improve performance of serialization/deserialization of types serialized as BSON arrays&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-750&quot;&gt;&lt;del&gt;CSHARP-750&lt;/del&gt;&lt;/a&gt;: Optimize serialization of enumerable types.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/060902ad10a7a2de1f1e4f96aa545db99d3f3162&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/060902ad10a7a2de1f1e4f96aa545db99d3f3162&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="376725" author="auto" created="Tue, 9 Jul 2013 00:54:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;DmitryNaumov&apos;, u&apos;name&apos;: u&apos;Dmitry Naumov&apos;, u&apos;email&apos;: u&apos;dnaumov@paladyne.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-750&quot; title=&quot;Improve performance of serialization/deserialization of types serialized as BSON arrays&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-750&quot;&gt;&lt;del&gt;CSHARP-750&lt;/del&gt;&lt;/a&gt;: Fixed array of value type serialization performance issue&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/3ccfbb1666e02888f562c7823ebf558620e6115a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/3ccfbb1666e02888f562c7823ebf558620e6115a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="361630" author="dnaumov" created="Mon, 17 Jun 2013 09:42:25 +0000"  >&lt;p&gt;I&apos;ve updated pull request, now it contains optimizations for both serialization and deserialization. I also thought about covering such case:&lt;br/&gt;
class Dog : Animal {}&lt;br/&gt;
and serializing Animal[] where no nulls and all items are of type Dog. It will require additional pass through array, which is not a big deal, but I was concerned about code complexity growth and decided that such rare case won&apos;t payback it&apos;s optimization.&lt;/p&gt;</comment>
                            <comment id="359619" author="sallgeud" created="Thu, 13 Jun 2013 17:35:42 +0000"  >&lt;p&gt;I suppose I&apos;m speaking more of DEserialization, but bunched it with &quot;serialization&quot; as a whole.  Our mongo machines are physically separate from our web servers.  The mongo servers never really use more than 4-5% cpu &lt;span class=&quot;error&quot;&gt;&amp;#91;each&amp;#93;&lt;/span&gt;, even when half a dozen web servers are being load tested.  &lt;/p&gt;

&lt;p&gt;When we run the load test with a performance profiler enabled on the web site (IIS8), the vast majority of the CPU time used is in deserialization of objects coming out of mongo.  We utilize some in-memory short-term caching to get around having to re-deserialize the same objects multiple times on a request, but still see that as the most major bottleneck.&lt;/p&gt;

&lt;p&gt;In all honesty, we know it&apos;s always going to be the largest resource hog, which is why even minor improvements in its performance will go a very long way to reducing our need to scale.  I was only suggesting that some of the recent improvements made to other libraries for performance could be re-used &lt;span class=&quot;error&quot;&gt;&amp;#91;if legal&amp;#93;&lt;/span&gt; to improve the deserialization performance of the mongo.C# driver.&lt;/p&gt;

&lt;p&gt;Interestingly enough, Json.NET supports BSON, so it may be relatively easy to integrate by wrapping it with your customizations, so that future performance improvements to Json.NET automatically end up working in your code.&lt;/p&gt;

&lt;p&gt;It&apos;s really just an idea I had.  There may be several reasons &lt;span class=&quot;error&quot;&gt;&amp;#91;political, security&amp;#93;&lt;/span&gt;, that you don&apos;t want to simply integrate with a non-mongo-controlled third party open source library.  Fortunately it&apos;s got an MIT license, so it can be copied without much headache.&lt;/p&gt;</comment>
                            <comment id="359449" author="rstam" created="Thu, 13 Jun 2013 14:13:54 +0000"  >&lt;p&gt;You certainly could do that. We&apos;re not going to be working on this just yet, so you have time to submit a new pull request.&lt;/p&gt;

&lt;p&gt;Thanks!&lt;/p&gt;</comment>
                            <comment id="359290" author="dnaumov" created="Thu, 13 Jun 2013 08:25:24 +0000"  >&lt;p&gt;Robert,&lt;br/&gt;
suppose I have time and will to do it, should I improve my pull request, add what you&apos;ve mentioned above plus apply same improvement to deserialization side?&lt;/p&gt;</comment>
                            <comment id="359284" author="dnaumov" created="Thu, 13 Jun 2013 08:07:42 +0000"  >&lt;p&gt;Chad,&lt;br/&gt;
you&apos;re right about serialization as most CPU utilizing task, but imho it really matters on server-side inside mongod which is written on C++ not C#. So how can we use advantages on Json.Net?&lt;/p&gt;</comment>
                            <comment id="359023" author="sallgeud" created="Wed, 12 Jun 2013 22:12:27 +0000"  >&lt;p&gt;Is it worthwhile to look at what newtonsoft/json.net has done recently in their serialization code that has dramatically improved its performance beyond where serviceStack is?  Because mongo is so performant, our bottleneck (or location requiring most scalability) is our web site.  Serialization is the vast majority of the CPU utilization, so focusing here and incorporating what others have done (as you guys have done very well in the past), could be good to do again.&lt;/p&gt;</comment>
                            <comment id="357940" author="rstam" created="Tue, 11 Jun 2013 18:35:58 +0000"  >&lt;p&gt;Thanks for the additional comments. We are looking to centralize all array-like serialization into a common base class, at which point we can make as many optimizations as we want without having to copy and paste them to all the other array-like serializers (the 10 or so listed earlier).&lt;/p&gt;

&lt;p&gt;We can definitely optimize value types separately from reference types. We won&apos;t forget about the Utf8Encoding change either. The plan is to merge your pull request and make further changes from there.&lt;/p&gt;
</comment>
                            <comment id="357901" author="dnaumov" created="Tue, 11 Jun 2013 18:14:16 +0000"  >&lt;p&gt;A few things to mention:&lt;/p&gt;

&lt;p&gt;1. for-loop is penalized by boundaries check on each iteration.&lt;br/&gt;
2. Don&apos;t forget another part of fix - avoiding per-call instantiation of UTF8Encoding&lt;br/&gt;
3. As far as I remember code, same optimization can be performed on deserialization call&lt;br/&gt;
4. I know GetType() is fast, but why not to avoid extra calls...&lt;/p&gt;</comment>
                            <comment id="357755" author="rstam" created="Tue, 11 Jun 2013 15:47:03 +0000"  >&lt;p&gt;A better version of the alternative change proposed two comments ago is:&lt;/p&gt;

&lt;p/&gt;
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&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;var itemNominalType = typeof(T);&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;var itemNominalTypeSerializer = BsonSerializer.LookupSerializer(itemNominalType);&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;bsonWriter.WriteStartArray();&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;foreach (var item in array)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    IBsonSerializer itemSerializer;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    if (item.GetType() == itemNominalType)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        itemSerializer = itemNominalTypeSerializer;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    else&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        itemSerializer = BsonSerializer.LookupSerializer(item.GetType());&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    itemSerializer.Serialize(bsonWriter, itemNominalType, item, itemSerializationOptions);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;bsonWriter.WriteEndArray();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This version emphasizes that what we&apos;re doing is optimizing the selection of the serializer, and only has one call to Serialize (using whatever serializer was chosen).&lt;/p&gt;

&lt;p&gt;It also abandons the numeric for loop in favor of foreach. Presumably someone thought that for was faster than foreach, but I did some benchmarks and they are virtually identical, so the simpler form is preferable.&lt;/p&gt;
</comment>
                            <comment id="357687" author="rstam" created="Tue, 11 Jun 2013 14:54:12 +0000"  >&lt;p&gt;There are several other serializers that would benefit from a similar optimization:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;EnumerableSerializer&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;EnumerableSerializer&amp;lt;T&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;QueueSerializer&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;QueueSerializer&amp;lt;T&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;ReadOnlyCollectionSerializer&amp;lt;T&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;StackSerializer&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;StackSerializer&amp;lt;T&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;ThreeDimensionalArraySerializer&amp;lt;T&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;TwoDimensionalArraySerializer&amp;lt;T&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="357680" author="rstam" created="Tue, 11 Jun 2013 14:49:01 +0000"  >&lt;p&gt;A similar change based on the same idea is:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;var itemNominalType = typeof(T);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;var itemNominalTypeSerializer = BsonSerializer.LookupSerializer(itemNominalType);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;bsonWriter.WriteStartArray();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;for (int index = 0; index &amp;lt; array.Length; index++)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    var item = array[index];&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    if (item.GetType() == itemNominalType)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        itemNominalTypeSerializer.Serialize(bsonWriter, itemNominalType, item, itemSerializationOptions);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    else&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        BsonSerializer.Serialize(bsonWriter, typeof(T), array[index], itemSerializationOptions);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;bsonWriter.WriteEndArray();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This alternative would benefit homogenous arrays of all types, whether they are value types or not.&lt;/p&gt;</comment>
                            <comment id="356688" author="dnaumov" created="Mon, 10 Jun 2013 10:09:24 +0000"  >&lt;p&gt;This issue was hidden by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9754&quot; title=&quot;Every write to journal costs additional seek to update file metadata&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9754&quot;&gt;&lt;del&gt;SERVER-9754&lt;/del&gt;&lt;/a&gt; where disk i/o was bottleneck, please consider it if you run your own benchmarks.&lt;/p&gt;</comment>
                            <comment id="353498" author="craiggwilson" created="Wed, 5 Jun 2013 12:13:24 +0000"  >&lt;p&gt;Thanks Dmitry.  We&apos;ll definitely take a look.&lt;/p&gt;</comment>
                            <comment id="353479" author="dnaumov" created="Wed, 5 Jun 2013 11:29:24 +0000"  >&lt;p&gt;With another fix removing per-call creation of UTF8Encoding, the numbers are even better:&lt;/p&gt;

&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Threads&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Unpatched&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Patched&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;      1&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;    11883&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  10250&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;      2&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;    14198&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  10424&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;      3&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;    19870&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  10643&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;      4&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;    19930&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  11220&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;      5&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;    20025&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  11611&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;      6&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;    20892&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  12446&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
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</comment>
                            <comment id="353422" author="dnaumov" created="Wed, 5 Jun 2013 09:50:29 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/pull/159&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/pull/159&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Benchmark results for inserting document with array of 1000 ints:&lt;/p&gt;

&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Threads&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Unpatched&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Patched&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;      1&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;    11883&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  10918&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;      2&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;    14198&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  11554&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;      3&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;    19870&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  11752&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;      4&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;    19930&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  12878&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;      5&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;    20025&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  14029&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;      6&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;    20892&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  15750&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;
</comment>
                    </comments>
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                            <attachment id="27610" name="LookupSerializer.jpg" size="224465" author="dnaumov" created="Wed, 5 Jun 2013 06:22:06 +0000"/>
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