Linux – Find process causing IO wait time

centoslinuxmulti-coreprocess

mpstat -P ALL shows high %wa time on a single core from an 8 core CPU and I'm trying to figure out what's writing to disk. So how can I figure out what is running on that CPU core?

Best Answer

Run iotop and will show processes writing on disk.

Press a in it to top the most greedy process.

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lsof The following will return a list of all files that are open for writing:**

lsof | grep -e "[[:digit:]]\+w"

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Linux – Can I Nohup/Screen an Already-Started Process?

If you're using Bash, you can run disown -h job

disown
disown [-ar] [-h] [jobspec ...]
Without options, each jobspec is removed from the table of active jobs. If the -h option is given, the job is not removed from the table, but is marked so that SIGHUP is not sent to the job if the shell receives a SIGHUP. If jobspec is not present, and neither the -a nor -r option is supplied, the current job is used. If no jobspec is supplied, the -a option means to remove or mark all jobs; the -r option without a jobspec argument restricts operation to running jobs.

Linux – Check Environment Variables of a Running Process on Unix

cat /proc/<pid>/environ

If you want to have pid(s) of a given running executable you can, among a number of other possibilities, use pidof:

AlberT$ pidof sshd   
30690 6512

EDIT:

I totally quote Dennis Williamson and Teddy comments to achieve a more readable output. My solution is the following:

tr '\0' '\n' < /proc/<pid>/environ

Best Answer

Related Solutions

Linux – Can I Nohup/Screen an Already-Started Process?

Linux – Check Environment Variables of a Running Process on Unix

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