Re: operf taking 100% cpu

On 01/27/2015 08:31 AM, Maucci, Cyrille wrote:
> Did you try ‘perf top’ on operf ? J

"perf top" will require root privileges. Alternatively,  as a normal users you could use:

- "perf record --pid=<monitored_operf_pid>"
- in a different directory to avoid overwiting the data you could use another operf with the --pid=<monitored_operf_pid> 

Xin, could you post the results on this mailing lis?.  It would be good to eliminate this issue from operf.

-Will 
> 
>  
> 
> *From:*Xin Tong [mailto:[email protected]]
> *Sent:* Friday, January 23, 2015 12:57 AM
> *To:* [email protected]
> *Subject:* operf taking 100% cpu
> 
>  
> 
> I am running oprofile on a linux intel haswell machine. and the operf process is taking close to 100% of the time. what is operf doing with that amount of cpu cycles ? maybe its polling on something ? how do i fix this ?
> 
>  
> 
> operf --separate-thread --event=CPU_CLK_UNHALTED:10000000 ./gcc/bin/viterb00data_2.exe -autogo && opreport  -l -g -d --xml -o current.opm
> 
>  
> 
> top - 15:56:34 up 69 days,  2:59, 13 users,  load average: 2.04, 1.71, 1.43
> 
> Tasks: 1196 total,   4 running, 1191 sleeping,   1 stopped,   0 zombie
> 
> Cpu(s):  1.1%us,  0.1%sy,  0.0%ni, 98.7%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
> 
> Mem:  60853364k total, 39834668k used, 21018696k free,   818524k buffers
> 
> Swap: 20479992k total,     1428k used, 20478564k free, 34594044k cached
> 
>  
> 
>    PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
> 
>    755 root      39  19     0    0    0 R 98.3  0.0   6891:01 kipmi0
> 
> 118201 xintong1  20   0 14448 1700 1412 R 98.3  0.0   0:03.06 operf
> 
> 118206 xintong1  20   0 15020  660  524 R 98.3  0.0   0:03.06 viterb00data_2.
> 
>  
> 
>  
> 
> Thanks,
> 
> Xin
> 
> 
> 
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Dive into the World of Parallel Programming. The Go Parallel Website,
sponsored by Intel and developed in partnership with Slashdot Media, is your
hub for all things parallel software development, from weekly thought
leadership blogs to news, videos, case studies, tutorials and more. Take a
look and join the conversation now. http://goparallel.sourceforge.net/