Nginx high cpu usage - Big static file server

Might need some troubleshooting to see where the load is coming from. Also pay attention to cpu steal time (top reported as %st time and sar -u command reports it as %steal time - used by other neighbouring VPS users on same VPS host node).

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           us, user    : time running un-niced user processes
           sy, system  : time running kernel processes
           ni, nice    : time running niced user processes
           id, idle    : time spent in the kernel idle handler
           wa, IO-wait : time waiting for I/O completion
           hi : time spent servicing hardware interrupts
           si : time spent servicing software interrupts
           st : time stolen from this vm by the hypervisor

Is this same VPS used for Easyengine with Ubuntu just reloaded with CentOS and Centmin Mod, or did you get a new VPS with same web host to install CentOS/Centmin Mod ? As you could of gotten on a VPS host node which is busier and have higher cpu steal time unlike your previous Easyengine VPS server.

FYI, CPU load optimal is 1.0 per cpu thread so 8 cpu thread normal = 8x1 = 8.0. 16 cpu server normal is 16x1 = 16.0

so cpu load of 8 for

• 2 cpu server = 8/2 = 4.0 load average
• 4 cpu server = 8/4 = 2.0 load average
• 8 cpu server = 8/8 = 1.0 load average

When you type top command, hit number 1 to break down per cpu stats

Centmin Mod is provided as is, so troubleshooting load issues is left to end user to do. However, there's many linux tools and scripts that can help you figure out what was causing the load issues and when.

If you're providing info on this forum, more info might be helpful

1. What version of Centmin Mod ? .08 stable or .09 beta ? If .09 beta when was it installed and when was last time you updated ?
2. What's your VPS/Server hardware specifications ? cpu type ? memory available ? disk space ?
3. Who's your web host ? Different hosts have different limits for server resource usage and some are more restrictive that others so it could just be their resource usage policy you tripped which may or may not be restrictive. If restrictive, then real solution would be finding a better web host. If not restrictive, then it's finding out what caused high cpu load.
4. If running Centmin Mod 123.09beta01 or higher, you will have access to a cminfo top command which can also provide a summary of statistics - some of which are explained in info and linked articles below.

Tools and commands you will want to read up on and learn for basic system admin tasks and troubleshooting.

• 20 Command Line Tools to Monitor Linux Performance
• 13 Linux Performance Monitoring Tools - Part 2
• 80 Linux Monitoring Tools for SysAdmins - Server Density Blog
• Amazing ! 25 Linux Performance Monitoring Tools
• 20 Linux System Monitoring Tools Every SysAdmin Should Know
• My mysqlmymonlite.sh script can help with that mysqlmymonlite.sh Addon | Centmin Mod Community README text file has instructions for setting up a cronjob to email you reports i.e. every 10/15min or every hour.

Notes:

• Centmin Mod already installed Glances tool. It can be invoked from SSH command glances or top2. Official Glances site at nicolargo.github.io/glances/ and documentation here.

For example what's output for these commands

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top -bn1

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ps aufxw

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sar -q

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sar -r

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sar -q -f /var/log/sa/sa$(date +%d -d yesterday)

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sar -r -f /var/log/sa/sa$(date +%d -d yesterday)

If you want to look at per process usage stats use pidstat run pidstat every 1 sec for 5 runs and sed is just to replace your main hostname with word hostname so mask your domain for posting on public places

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pidstat -durh 1 5 | sed -e "s|$(hostname)|hostname|g"

for posting code you might want to use CODE tags for code How to use forum BBCODE code tags