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<p class="MsoNormal"><span lang="EN-US">Hi community,<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">I am using nginx as L1 Cache for small static files(10~100k) and use xfs as low level file system.<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">450G SSD is used and when files number stored to 25000000 and disk usage up to 85%, system load is very high (>15, on 32 CPUs ).<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">After basic debug/detect it using perf, I located the hot code at creating tmpfiles while receiving upstream data, showed as below:<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"><img width="641" height="789" id="ͼƬ_x0020_1" src="cid:image002.jpg@01D035A2.9EF5B020"></span><span lang="EN-US"><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">Can any can guide me how to disable creating tmpfile for small (<200k) files and write to target cache dir while finished directly?<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">I have tried some configure item like: proxy_max_temp_file_size, from official document for proxy_max_temp_file_size I found:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">¡°</span><span lang="EN-US" style="font-size:13.5pt;font-family:"Arial",sans-serif;color:black;background:white">The zero value disables buffering of responses to temporary files.</span><span lang="EN-US">¡±<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">But why tmpfile still be created?<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">It seems that meta operation (inode alloc/free) is the bottleneck while using nginx to cache small files, could anyone give some way to optimize it?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">For example:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- switch to other filesystem like ext4 ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- adjust some keys_zone polices?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">- others?<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">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Qiang<o:p></o:p></span></p>
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