Re: Isolating high cpu load at function level

2009-06-24 Thread Mel Flynn 
On Wednesday 24 June 2009 07:42:06 Gary Gatten wrote:

> I have a process with several threads - the main "worker" threads
> typically use < 20% CPU - but after upgrading to a new version they're
> now using > 90% cpu.  I'm trying to determine what function these
> threads are performing that's requiring so much more cpu.  Is it bad
> code? I bug in a library I linked against?  What?
>
>
>
> I've tried gdb with list, info threads, info stack, bt full.  I can make
> sense of some of it.  I guess what I'm hoping for is something like
> "top" at the thread level, such that functions that thread perform are
> sorted highest util (time/whatever).

You'd typically turn on profiling, but sometimes less information is good, so 
you might be able to get the info you need by having your workers report the 
information.

libwp[1] has some support for reporting that you could extend with values 
you're interested in.

[1] http://www.garypennington.net/libwp/docs/html/
-- 
Mel
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Isolating high cpu load at function level

2009-06-24 Thread Gary Gatten 
Hello,

 

I have a process with several threads - the main "worker" threads
typically use < 20% CPU - but after upgrading to a new version they're
now using > 90% cpu.  I'm trying to determine what function these
threads are performing that's requiring so much more cpu.  Is it bad
code? I bug in a library I linked against?  What?

 

I've tried gdb with list, info threads, info stack, bt full.  I can make
sense of some of it.  I guess what I'm hoping for is something like
"top" at the thread level, such that functions that thread perform are
sorted highest util (time/whatever).

 

TIA for any help!

 

Gary

 









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