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litespeed_wiki:php:server-load-issue [2019/05/14 20:50]
Lisa Clarke Proofreading
litespeed_wiki:php:server-load-issue [2019/06/12 21:04]
Jackson Zhang
Line 8: Line 8:
   * Try to use our [[https://​www.litespeedtech.com/​products/​cache-plugins|LSCache solutions]] to lower the load.   * Try to use our [[https://​www.litespeedtech.com/​products/​cache-plugins|LSCache solutions]] to lower the load.
   * It is always good practice to use the ''​top''​ or ''​atop''​ command to check which processes are using a lot of CPU resources, and then figure out whether they are behaving normally. ​   * It is always good practice to use the ''​top''​ or ''​atop''​ command to check which processes are using a lot of CPU resources, and then figure out whether they are behaving normally. ​
-  * If disk I/O is high, it is likely a disk I/O problem, which you should address. If you have more free memory available, you can move php sessions to ''/​dev/​shm''​.+  * If disk I/O is high, it is likely a disk I/O problem, which you should address. If you have more free memory available, you can move php sessions to ''/​dev/​shm''​. Disk I/O issue example: <​code>​top -c</​code>​ iowait ''​41.6 wa''​ is too high. then check further <​code>​ostat -x 
 +Linux 3.10.0-962.3.2.lve1.5.24.10.el7.x86_64 (lbr27.lalunahost.com.br) ​ 04/​18/​2019 ​     _x86_64_ ​       (8 CPU) 
 + 
 +avg-cpu: ​ %user   %nice %system %iowait ​ %steal ​  ​%idle 
 +           ​6.65 ​   0.15    2.16   ​20.24 ​   0.00   ​70.80 
 + 
 +Device: ​        ​rrqm/​s ​  ​wrqm/​s ​    ​r/​s ​    ​w/​s ​   rkB/s    wkB/s avgrq-sz avgqu-sz ​  await r_await w_await ​ svctm  %util 
 +sdb               ​0.16 ​    ​7.43 ​  ​16.61 ​   1.80    74.74    78.56    16.65     ​2.46 ​ 133.39 ​   8.38 1284.98 ​  ​1.45 ​  ​2.68 
 +sda              28.25   ​134.39 ​  ​93.98 ​  ​54.24 ​ 1445.73 ​ 1227.69 ​   36.07     ​2.11 ​  ​14.18 ​  ​46.67 ​  ​79.17 ​  ​4.86 ​ 72.08</​code>​ ''/​dev/​sda''​ has problem, ''/​dev/​sdb''​ is ok.
   * Check the CPU idle percentage. If it is close to 0%, then your server is CPU-bound and you should try to reduce the CPU usage. ​   * Check the CPU idle percentage. If it is close to 0%, then your server is CPU-bound and you should try to reduce the CPU usage. ​
   * When CloudLinux is used, you should try to use the LVE limit to prevent any one user from consuming all of the resources.   * When CloudLinux is used, you should try to use the LVE limit to prevent any one user from consuming all of the resources.
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  • Last modified: 2019/08/27 12:58
  • by Jackson Zhang