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Posted to commits@rocketmq.apache.org by yu...@apache.org on 2017/07/14 13:01:34 UTC
[2/4] incubator-rocketmq-site git commit: Release
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-<div class="highlighter-rouge"><pre class="highlight"><code>-server -Xms8g -Xmx8g -Xmn4g
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-<div class="highlighter-rouge"><pre class="highlight"><code>-XX:+AlwaysPreTouch
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-<p>As for garbage collection, G1 collector with JDK 1.8 is recommended:</p>
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-<div class="highlighter-rouge"><pre class="highlight"><code>-XX:+UseG1GC -XX:G1HeapRegionSize=16m -XX:G1ReservePercent=25 -XX:InitiatingHeapOccupancyPercent=30
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-<p>These GC options looks a little aggressive, but it’s proved to have good performance in our production environment.</p>
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-<p>Don’t set a too small value for <code class="highlighter-rouge">-XX:MaxGCPauseMillis</code>, otherwise JVM will use a small young generation to achieve this goal which will cause very frequent minor GC.</p>
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-<p>And use rolling GC log file is recommended:</p>
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-<div class="highlighter-rouge"><pre class="highlight"><code>-XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=30m
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-<p>If write GC file will increase latency of broker, consider redirect GC log file to a memory file system:</p>
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-<div class="highlighter-rouge"><pre class="highlight"><code>-Xloggc:/dev/shm/mq_gc_%p.log
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-<h1 id="linux-kernel-parameters">Linux Kernel Parameters</h1>
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-<p>There is a <code class="highlighter-rouge">os.sh</code> script that lists a lot of kernel parameters in folder <code class="highlighter-rouge">bin</code> which can be used for production use with minor changes. Below parameters need attention, and more details please refer to documentation for /proc/sys/vm/*[1].</p>
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-<p><strong>vm.extra_free_kbytes</strong>, tells the VM to keep extra free memory between the threshold where background reclaim (kswapd) kicks in, and the threshold where direct reclaim (by allocating processes) kicks in. RocketMQ uses this parameter to avoid high latency in memory allocation.</p>
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-<p><strong>vm.min_free_kbytes</strong>, if you set this to lower than 1024KB, your system will
-become subtly broken, and prone to deadlock under high loads.</p>
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-<p><strong>vm.max_map_count</strong>, limits the maximum number of memory map areas a process
-may have. RocketMQ will use mmap to load CommitLog and ConsumeQueue, so set a bigger value for this parameter is recommended.</p>
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-<p><strong>vm.swappiness</strong>, define how aggressive the kernel will swap memory pages. Higher values will increase agressiveness, lower values decrease the amount of swap. 10 for this value to avoid swap latency is recommended.</p>
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-<p><strong>File descriptor limits</strong>, RocketMQ needs open file descriptors for files(CommitLog and ConsumeQueue) and network connections. We recommend set 655350 for file descriptors.</p>
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-<p><strong>Disk scheduler</strong>, the deadline I/O scheduler is recommended for RocketMQ, which attempts to provide a guaranteed latency for requests[2].</p>
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-<h1 id="reference">Reference</h1>
-<ol>
- <li>https://www.kernel.org/doc/Documentation/sysctl/vm.txt</li>
- <li>https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Performance_Tuning_Guide/ch06s04s02.html</li>
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<a href="/rocketmq/filter-messages-by-sql92-in-rocketmq/" rel="permalink">Filter Messages By SQL92 In RocketMQ
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<a href="/rocketmq/Field-Report-Meetup-Beijing/" rel="permalink">Field Report of Apache RocketMQ Meetup Beijing
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