#### Quick Tip: View view linux process limits

##### July 14, 2013

I have on several occasions needed to troubleshoot issues which wound up being problems with linux limiting the number of open files for a given process. This can be an annoying issue to troubleshoot since many programs do not gracefully handle this condition and linux does not provide log information which indicates the situation by default. This really applies to all of the linux process limits, not just open files.

So what do we do about it?

When you google the problem, you will typically find references to running ulimit as the service user to determine what the existing limits are. You will quickly discover, that this doesn’t work. For one thing, most service users don’t have shells. Additionally, as you will see in my next post, many services already have configuration which attempts to set the limits on program startup.

Enter the proc filesystem…

cat /proc/805/limits
Limit                     Soft Limit           Hard Limit           Units
Max cpu time              unlimited            unlimited            seconds
Max file size             unlimited            unlimited            bytes
Max data size             unlimited            unlimited            bytes
Max stack size            8388608              unlimited            bytes
Max core file size        0                    unlimited            bytes
Max resident set          unlimited            unlimited            bytes
Max processes             7807                 7807                 processes
Max open files            1024                 4096                 files
Max locked memory         65536                65536                bytes
Max address space         unlimited            unlimited            bytes
Max file locks            unlimited            unlimited            locks
Max pending signals       7807                 7807                 signals
Max msgqueue size         819200               819200               bytes
Max nice priority         0                    0
Max realtime priority     0                    0
Max realtime timeout      unlimited            unlimited            us


805 is the pid of the process you want to check.

Have fun…