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<p class="MsoNormal"><span lang="EN-US">Hello Gluster Community,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I was wondering if there are some things I could do to optimize gluster for small files.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Our bricks are 4 SSD in Raid0, and we have a replica set factor of 3<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">We have a use-case where we would like to optimize our gluster mount for small files (about 6kb).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Here’s my current benchmarks on my mount<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"># 1mb block size on RAID0 SSD<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">dd if=/dev/zero of=/ssd/test_ssd_1mb bs=1M count=100<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">100+0 records in<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">100+0 records out<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">104857600 bytes (105 MB) copied, 0.0577655 s, 1.8 GB/s<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US"># 1kb block size on RAID0 SSD<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">dd if=/dev/zero of=/ssd/test_ssd_1kb bs=1K count=100000<o:p></o:p></span></p>
<p class="MsoNormal">100000+0 records in<o:p></o:p></p>
<p class="MsoNormal">100000+0 records out<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">102400000 bytes (102 MB) copied, 0.181732 s, 563 MB/s<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"># 1mb block size on Gluster mount<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">dd if=/dev/zero of=/gluster/test_gluster_1mb bs=1M count=100<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">100+0 records in<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">100+0 records out<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">104857600 bytes (105 MB) copied, 0.219619 s, 477 MB/s<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"># 1kb block size on Gluster mount<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">dd if=/dev/zero of=/gluster/test_gluster_1kb bs=1K count=100000<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">100000+0 records in<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">100000+0 records out<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">102400000 bytes (102 MB) copied, 6.73986 s, 15.2 MB/s<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">As you can see, our performances on small block size are very low.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We’re running glusterfs 3.4.2, with the following options:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">diagnostics.count-fop-hits: on<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">diagnostics.latency-measurement: off<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">performance.cache-max-file-size: 64KB<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">performance.write-behind-window-size: 8MB<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">performance.cache-size: 2GB<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">performance.io-thread-count: 64<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">performance.flush-behind: off<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">performance.io-cache: on<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thank you for your help<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Jocelyn Hotte<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Tools Programmer, Ubisoft<o:p></o:p></span></p>
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