Retrieve CPU usage and memory usage of a single pr

Question

I want to get the CPU and memory usage of a single process on Linux - I know the PID. Hopefully, I can get it every second and write it to a CSV using the 'watch' command. What command can I use to get this info from the Linux command-line?

Answer 1

You could use top -b and grep out the pid you want (with the -b flag top runs in batch mode), or also use the -p flag and specify the pid without using grep.

Answer 2

Above list out the top cpu and memory consuming process

        ps axo %cpu,%mem,command | sort -nr | head

Answer 3

ps command (should not use):

• CPU usage is currently expressed as the percentage of time spent running during the entire lifetime of a process.

top command (should use):

• The task's share of the elapsed CPU time since the last screen update, expressed as a percentage of total CPU time.

Use top to get CPU usage in real time(current short interval):

top -b -n 2 -d 0.2 -p 6962 | tail -1 | awk '{print $9}'

will echo like: 78.6

• -b: Batch-mode
• -n 2: Number-of-iterations, use 2 because: When you first run it, it has no previous sample to compare to, so these initial values are the percentages since boot.
• -d 0.2: Delay-time(in second, here is 200ms)
• -p 6962: Monitor-PIDs
• tail -1: the last row
• awk '{print $9}': the 9-th column(the cpu usage number)

Answer 4

To get the memory usage of just your application (as opposed to the shared libraries it uses, you need to use the Linux smaps interface). This answer explains it well.

Answer 5

ps aux | awk '{print $4"\t"$11}' | sort | uniq -c | awk '{print $2" "$1" "$3}' | sort -nr

or per process

ps aux | awk '{print $4"\t"$11}' | sort | uniq -c | awk '{print $2" "$1" "$3}' | sort -nr |grep mysql

Answer 6

CPU and memory usage of a single process on Linux or you can get the top 10 cpu utilized processes by using below command

ps -aux --sort -pcpu | head -n 11