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    <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>
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<item>
            <title>[CSHARP-4300] Reduce memory traffic associated with Hasher.cs</title>
                <link>https://jira.mongodb.org/browse/CSHARP-4300</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;Follow up for &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-4292&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/CSHARP-4292&lt;/a&gt;&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Make Hasher a struct, to reduce memory traffic in associated GetHashCode.&lt;/li&gt;
	&lt;li&gt;Add public&#160;
&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;   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;Hasher Hash&amp;lt;T&amp;gt;(T obj) where T : struct&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;&#160;to eliminate boxing for value types (BsonArray.GetHashCode, Hasher.Hash(BsonType))&lt;/p&gt;&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2118287">CSHARP-4300</key>
            <summary>Reduce memory traffic associated with Hasher.cs</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="boris.dogadov@mongodb.com">Boris Dogadov</reporter>
                        <labels>
                    </labels>
                <created>Fri, 19 Aug 2022 18:55:24 +0000</created>
                <updated>Thu, 24 Aug 2023 08:10:38 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5655513" author="JIRAUSER1256534" created="Thu, 24 Aug 2023 08:10:38 +0000"  >&lt;p&gt;Turning Hasher into a struct isn&apos;t trivial (but feasible) because of the fluent API that it contains. Passing references back to &quot;this&quot; will cause the struct to be copied every time.&lt;/p&gt;

&lt;p&gt;Also, there is some more boxing-induced allocation going on in the current implementation, e.g. when passing a List&amp;lt;T&amp;gt; into&#160;&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;
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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;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;public&lt;/span&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; Hasher HashElements&amp;lt;T&amp;gt;(IEnumerable&amp;lt;T&amp;gt; sequence)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;How about switching to &lt;a href=&quot;https://learn.microsoft.com/en-us/dotnet/api/system.hashcode?view=net-7.0&amp;amp;viewFallbackFrom=netstandard-2.0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;System.HashCode&lt;/a&gt; altogether? This would remove all allocations and arguably provide even better hash codes.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="2111705">CSHARP-4292</issuekey>
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