Re: CPU Usage in running process on HP-UX 11.31
- From: Stefan Knecht <knecht.stefan@xxxxxxxxx>
- To: Andrew Kerber <andrew.kerber@xxxxxxxxx>
- Date: Wed, 9 Sep 2009 09:59:40 +0200
Thanks for the input ...
Andrew: We're way past this already. The system has been running stable and
well performing for a long time (using dedicated servers). Lately, due to
increasing number of users we've been running out of memory. Hence, shared
servers were turned on. And now we're running low on CPU due to the
dispatchers eating it all up. (before switching to shared server, CPU usage
was constantly at about 50%).
Tanel: You're right. However, we're on PA-Risc and pstack isn't available
there. So I suppose we have to use a debugger to get that information. And
I'm a bit reluctant to attach to a running process in production with a
debugger.
Cheers
Stefan
=========================
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=========================
On Tue, Sep 8, 2009 at 5:11 PM, Andrew Kerber <andrew.kerber@xxxxxxxxx>wrote:
> Can you tell what the CPU is doing? Is your library cache hit rate low,
> for example? This might indicate a lot of time spent parsing...
>
>
> On Tue, Sep 8, 2009 at 9:56 AM, Tanel Poder <tanel@xxxxxxxxxx> wrote:
>
>> tusc -c should be able to do what strace -c does on linux.
>>
>> However these tools do something different what pstack and stack profilers
>> do. Tusc and strace only show you *system call* information, but your
>> problem may not be in system calls but just excessive CPU usage in user
>> mode. A stack profiler will show you which codepath takes the most of time
>> in an executable.
>>
>> Tanel.
>>
>>
>> On Tue, Sep 8, 2009 at 8:29 PM, Stefan Knecht <knecht.stefan@xxxxxxxxx>wrote:
>>
>>> Hi Tanel
>>>
>>> Good point! I was hoping there was a tool that would do that for me ...
>>> Similar to what strace -c does on linux :-)
>>>
>>> I'll take a look at that
>>>
>>> Cheers
>>>
>>>
>>>
>>>
>> --
>> Tanel Poder
>> http://blog.tanelpoder.com
>>
>>
>
>
> --
> Andrew W. Kerber
>
> 'If at first you dont succeed, dont take up skydiving.'
>
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