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<channel>
    <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>[SERVER-16922] Slow index build times on secondaries with Wired Tiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-16922</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Testing Migration to Wired Tiger from MMAP0 in 2.6 by adding a WT Replica.&lt;/p&gt;


&lt;p&gt;Servers:&lt;br/&gt;
Data Volume - 1 TB&lt;br/&gt;
Servers Amazon C4.2XLarge&lt;br/&gt;
	8 x CPU&lt;br/&gt;
	15GB RAM&lt;br/&gt;
	Disks 2 x 1TB SSD EBS with 4000PIOS in Raid 0 (8000 PIOPS)&lt;/p&gt;

&lt;p&gt;No load on source (primary) server&lt;br/&gt;
522,771,027 Documents in collection&lt;/p&gt;

&lt;p&gt;Data Copying Phase:&lt;br/&gt;
Began: 08:15 16th Jan&lt;br/&gt;
Finished 18:23 16th Jan&lt;/p&gt;

&lt;p&gt;Creation of _id Index (_id is standard OID&apos;s)&lt;/p&gt;

&lt;p&gt;2015-01-16T18:23:17.006+0000 I -        &lt;span class=&quot;error&quot;&gt;&amp;#91;rsSync&amp;#93;&lt;/span&gt;   Index Build: 123300/522771027 0%&lt;/p&gt;

&lt;p&gt;Currently&lt;/p&gt;

&lt;p&gt;2015-01-17T19:09:58.004+0000 I -        &lt;span class=&quot;error&quot;&gt;&amp;#91;rsSync&amp;#93;&lt;/span&gt;   Index Build: 150625100/522771027 28%&lt;/p&gt;

&lt;p&gt;Not only over 24 hours for 28% but observably taking 4 minutes longer per 1%&lt;/p&gt;

&lt;p&gt;At 396 minutes for the final 1% Total predicted time is&lt;/p&gt;

&lt;p&gt;396/2 * 100 = 330 Hours to build one index.&lt;/p&gt;

&lt;p&gt;By comparison - I tested 2.6 on the same hardware and this step took 7hrs 36 minutes.&lt;/p&gt;

&lt;p&gt;Is this the case for all WT index creations - is time to build polynomial (and greater than n log n I think) with number of records - Is this just increasing indexes or all indexes. If I had 3 or 4 secondary indexes on this are they built sequentially or in parallel?&lt;/p&gt;

</description>
                <environment></environment>
        <key id="179321">SERVER-16922</key>
            <summary>Slow index build times on secondaries with Wired Tiger</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="atul.kachru">Atul Kachru</assignee>
                                    <reporter username="john.page@mongodb.com">John Page</reporter>
                        <labels>
                    </labels>
                <created>Sat, 17 Jan 2015 19:18:15 +0000</created>
                <updated>Fri, 3 Dec 2021 19:34:36 +0000</updated>
                            <resolved>Thu, 22 Jan 2015 01:07:31 +0000</resolved>
                                                    <fixVersion>3.0.0-rc6</fixVersion>
                                    <component>Replication</component>
                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="811366" author="mdcallag" created="Fri, 23 Jan 2015 02:18:06 +0000"  >&lt;p&gt;I get the problem using these files to load the database and then creating the indexes via the following:&lt;/p&gt;

&lt;p&gt;db.purchases_index.ensureIndex(&lt;/p&gt;
{&quot;price&quot;:1, &quot;customerid&quot;:1}
&lt;p&gt;, &lt;/p&gt;
{&quot;background&quot;:false}
&lt;p&gt;);&lt;br/&gt;
db.purchases_index.ensureIndex(&lt;/p&gt;
{&quot;cashregisterid&quot; : 1, &quot;price&quot; : 1, &quot;customerid&quot; : 1}
&lt;p&gt;, &lt;/p&gt;
{&quot;background&quot;:false}
&lt;p&gt;);&lt;br/&gt;
db.purchases_index.ensureIndex(&lt;/p&gt;
{&quot;price&quot; : 1, &quot;dateandtime&quot; : 1, &quot;customerid&quot; : 1}
&lt;p&gt;, &lt;/p&gt;
{&quot;background&quot;:false}
&lt;p&gt;);&lt;/p&gt;

&lt;p&gt;db.purchases_index.ensureIndex(&lt;/p&gt;
{&quot;price&quot;:1, &quot;customerid&quot;:1}
&lt;p&gt;, &lt;/p&gt;
{&quot;background&quot;:true}
&lt;p&gt;);&lt;br/&gt;
db.purchases_index.ensureIndex(&lt;/p&gt;
{&quot;cashregisterid&quot; : 1, &quot;price&quot; : 1, &quot;customerid&quot; : 1}
&lt;p&gt;, &lt;/p&gt;
{&quot;background&quot;:true}
&lt;p&gt;);&lt;br/&gt;
db.purchases_index.ensureIndex(&lt;/p&gt;
{&quot;price&quot; : 1, &quot;dateandtime&quot; : 1, &quot;customerid&quot; : 1}
&lt;p&gt;, &lt;/p&gt;
{&quot;background&quot;:true}
&lt;p&gt;);&lt;/p&gt;

&lt;p&gt;WiredTiger was used via:&lt;br/&gt;
--storageEngine wiredTiger --wiredTigerCacheSizeGB 4&lt;/p&gt;

&lt;p&gt;And mongo.conf had:&lt;br/&gt;
processManagement:&lt;br/&gt;
  fork: true&lt;br/&gt;
systemLog:&lt;br/&gt;
  destination: file&lt;br/&gt;
  path: /data/mysql/mongo.280rc4/log&lt;br/&gt;
  logAppend: true&lt;br/&gt;
storage:&lt;br/&gt;
  syncPeriodSecs: 60&lt;br/&gt;
  dbPath: /data/mysql/mongo.280rc4/data&lt;br/&gt;
  journal:&lt;br/&gt;
    enabled: true&lt;br/&gt;
  mmapv1:&lt;br/&gt;
    journal:&lt;br/&gt;
      commitIntervalMs: 100&lt;br/&gt;
storage.wiredTiger.collectionConfig.blockCompressor: snappy&lt;br/&gt;
storage.wiredTiger.engineConfig.journalCompressor: snappy&lt;/p&gt;</comment>
                            <comment id="811307" author="mdcallag" created="Fri, 23 Jan 2015 00:18:13 +0000"  >&lt;p&gt;With rc4 I get good performance for background:false index builds and lousy performance for background:true With rc5 I get lousy performance for background:false and it runs for so long I have yet to try background:true. The call stack above looks familiar. I didn&apos;t need a secondary to reproduce it, just ran with a 4G block cache and a 100G database. The indexes should be ~2G each when done.&lt;/p&gt;</comment>
                            <comment id="810202" author="mark.benvenuto" created="Thu, 22 Jan 2015 01:07:31 +0000"  >&lt;p&gt;Fixed with: &lt;a href=&quot;https://github.com/mongodb/mongo/commit/876f5f475bf9242c098e6de641aa7ee0982803c2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/876f5f475bf9242c098e6de641aa7ee0982803c2&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;CAP&lt;/b&gt;: Do we need a perf test around index builds on secondaries where the secondary wiredtiger?&lt;/p&gt;</comment>
                            <comment id="810200" author="mark.benvenuto" created="Thu, 22 Jan 2015 01:05:37 +0000"  >&lt;p&gt;Thanks to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=john.page&quot; class=&quot;user-hover&quot; rel=&quot;john.page&quot;&gt;john.page&lt;/a&gt; for the excellent repro. Following his instructions, I was able to reproduce the issue on EC2 C2.2XL.&lt;/p&gt;

&lt;p&gt;Fundamentally, we believe issue was how WT handled splits. The good news is that I can no longer repro this with the latest WT import yesterday. (&lt;a href=&quot;https://github.com/mongodb/mongo/commit/876f5f475bf9242c098e6de641aa7ee0982803c2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/876f5f475bf9242c098e6de641aa7ee0982803c2&lt;/a&gt;). I believe it is a result of a fix by &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=keith.bostic&quot; class=&quot;user-hover&quot; rel=&quot;keith.bostic&quot;&gt;keith.bostic&lt;/a&gt; in the bt_split.c. In both cases pre and post fix, the &lt;tt&gt;maximum tree depth&lt;/tt&gt; was 3.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Details&lt;/b&gt;&lt;br/&gt;
This is a perf snapshot against a rc5 build with symbols on Ubuntu 14.04 LTS.&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;perf record -F 99  --call-graph dwarf -o perf6.data -p `pgrep mongod` &amp;#8211; sleep 30&lt;/tt&gt;&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;perf report --stdio&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;# captured on: Wed Jan 21 21:53:45 2015&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;# hostname : ip-10-203-204-146&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;# os release : 3.13.0-36-generic&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;# perf version : 3.13.11.6&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;# arch : x86_64&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;# nrcpus online : 8&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;# nrcpus avail : 8&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;# cpudesc : Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz&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;# cpuid : GenuineIntel,6,62,4&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;# total memory : 15400880 kB&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;# cmdline : /usr/lib/linux-tools-3.13.0-36/perf record -F 99 --call-graph dwarf -o perf6.data -p 7502 -- sleep 30&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;# event : name = cpu-clock, type = 1, config = 0x0, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_kern = 0, excl_host = 0, excl_guest = 1, precise_ip = 0,&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;# HEADER_CPU_TOPOLOGY info available, use -I to display&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;# HEADER_NUMA_TOPOLOGY info available, use -I to display&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;# pmu mappings: software = 1, tracepoint = 2, breakpoint = 5&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;   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;# Samples: 2K of event &apos;cpu-clock&apos;&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;# Event count (approx.): 28313131030&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;# Overhead  Command       Shared Object                                                                                                  Symbol&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;   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;    98.79%   mongod  mongod              [.] __wt_tree_walk&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;             --- __wt_tree_walk&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;                 __wt_btcur_next&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;                 __curfile_next&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;                 mongo::WiredTigerRecordStore::Iterator::_getNext()&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="809317" author="john.page" created="Wed, 21 Jan 2015 07:49:09 +0000"  >&lt;p&gt;Insert generator&lt;/p&gt;</comment>
                            <comment id="809048" author="john.page" created="Wed, 21 Jan 2015 00:29:24 +0000"  >&lt;p&gt;I tested with 540M and 185M documents which is not a large set. Any decent&lt;br/&gt;
loader will hit 60,000 per second on map 2.6 so it doesn&apos;t take long to&lt;br/&gt;
build a set like that. I&apos;ll send you details of my hardware and loader&lt;br/&gt;
tomorrow but windows 8 won&apos;t come close.&lt;/p&gt;
</comment>
                            <comment id="809047" author="john.page" created="Wed, 21 Jan 2015 00:29:24 +0000"  >&lt;p&gt;I tested with 540M and 185M documents which is not a large set. Any decent&lt;br/&gt;
loader will hit 60,000 per second on map 2.6 so it doesn&apos;t take long to&lt;br/&gt;
build a set like that. I&apos;ll send you details of my hardware and loader&lt;br/&gt;
tomorrow but windows 8 won&apos;t come close.&lt;/p&gt;
</comment>
                            <comment id="809044" author="john.page" created="Wed, 21 Jan 2015 00:27:24 +0000"  >&lt;p&gt;I tested with 540M and 185M documents which is not a large set. Any decent&lt;br/&gt;
loader will hit 60,000 per second on map 2.6 so it doesn&apos;t take long to&lt;br/&gt;
build a set like that. I&apos;ll send you details of my hardware and loader&lt;br/&gt;
tomorrow but windows 8 won&apos;t come close.&lt;/p&gt;
</comment>
                            <comment id="807581" author="john.page" created="Mon, 19 Jan 2015 13:16:38 +0000"  >&lt;p&gt;I&apos;m seeing nice fast index build times when testing general index building so reproducing original  issue.&lt;/p&gt;</comment>
                            <comment id="807193" author="john.page" created="Sat, 17 Jan 2015 21:03:24 +0000"  >&lt;p&gt;I have halted instances buy may have the logs if root is ebs, this is&lt;br/&gt;
latest 2.8 rc candidate as of 16th&lt;/p&gt;
</comment>
                            <comment id="807189" author="scotthernandez" created="Sat, 17 Jan 2015 20:58:16 +0000"  >&lt;p&gt;Please include the version and logs for the server (which should include the startup stanza).&lt;/p&gt;</comment>
                            <comment id="807179" author="john.page" created="Sat, 17 Jan 2015 19:35:24 +0000"  >&lt;p&gt;My bad, was supposed to be a bug&lt;/p&gt;
</comment>
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