linux中的ps实用程序（procps），如何检查使用的是哪个CPU

Question

It is about procps package, utility ps for linux.

Can it print the number of last used CPU for each process (thread)?

Update: Not a CPU Time (10 seconds), but a CPU NUMBER (CPU0,CPU5,CPU123)

Answer 1

The ps(1) man page says you can use the psr field:

  psr PSR processor that process is currently assigned to. 

$ ps -o pid,psr,comm
  PID PSR COMMAND
 7871   1 bash
 9953   3 ps

Or you can use the cpuid field, which does the same thing.

$ ps -o pid,cpuid,comm
  PID CPUID COMMAND
 7871     1 bash
10746     3 ps

The reason for two names is for compatibility with Solaris ( psr ) and NetBSD/OpenBSD ( cpuid ).

To get threads too, add the -L option (and the lwp field if you are using -o ).

Without threads:

$ ps -U $USER -o pid,psr,comm | egrep 'chromi|PID' | head -4
  PID PSR COMMAND
 6457   3 chromium-browse
 6459   0 chromium-browse
 6461   2 chromium-browse

With threads:

$ ps -U $USER -L -o pid,lwp,psr,comm | egrep 'chromi|PID' | head -4
  PID   LWP PSR COMMAND
 6457  6457   3 chromium-browse
 6457  6464   1 chromium-browse
 6457  6465   2 chromium-browse

There's also an undocumented -P option, which adds psr to the normal fields:

$ ps -U $USER -LP | egrep 'chromi|PID' | head -4
  PID   LWP PSR TTY          TIME CMD
 6457  6457   3 ?        00:01:19 chromium-browse
 6457  6464   1 ?        00:00:00 chromium-browse
 6457  6465   2 ?        00:00:00 chromium-browse

Answer 2

which of multiple processors? it does not offer an option for that according to the manpage. but on my Debian stable system it accepts the undocumented -o cpu

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after looking at the source, and the output of ps L , I believe your answer is either the cpuid or sgi_p output options, column IDs CPUID and P, respectively.

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And 'cpu' should work according to this note in output.c, but it's currently tied to the 'nop' output pr_nop():

{"cpu", "CPU", pr_nop, sr_nop, 3, 0, BSD, AN|RIGHT}, /* FIXME ... HP-UX wants this as the CPU number for SMP? */

Answer 3

也被低估了：

mpstat -I ALL 1 | less -SR

Answer 4

I did it this way on Arch, it might help someone out there:

ps -C "process" -L -o pid,lwp,pcpu,cpuid,time

• -C : select the process named "process"
• -L : list the process threads
• -o : specify output info
  • pid : process id
  • lwp : light weight process (thread)
  • pcpu : CPU usage (percent)
  • cpuid : CPU id
  • time : thread time (from start)