Re: Shark attributing time oddly to source
Re: Shark attributing time oddly to source
- Subject: Re: Shark attributing time oddly to source
- From: Rick Altherr <email@hidden>
- Date: Tue, 14 Apr 2009 16:36:32 -0700
For the archives: the code was being compiled with -ggdb. Compiling
with -g instead resolved the problems.
Rick
On Apr 14, 2009, at 12:10 AM, Rick Altherr wrote:
On Apr 13, 2009, at 6:40 PM, Benson Margulies wrote:
Oddly, while Rick's post helped me see what's slow about this code,
it
doesn't explain much about the results themselves. The function in
question really distributed all of its time to a set of static
functions called by function pointer, and so certainly not inlined.
None of them show up in the profile at all.
If you can reproduce this with a test case, please file a bug report.
I replaced the function pointery with calls to inlinable functions.
And now I'm a bit stumped because Shark has cached an old copy of the
source somewhere and I don't know how to get it to see the current
source.
Restart Shark. We are aware of this problem.
On Mon, Apr 13, 2009 at 9:29 PM, Greg Guerin <email@hidden>
wrote:
Rick Altherr wrote:
- This function is called _very_ frequently but isn't inlined.
Thus, the
time spent on the return is actually time spent in the epilog of
the
function. You options are to reduce the number of calls to the
function or
to inline it.
- The function runs very quickly but is also called frequently.
In this
case, Nyquist might require a faster sampling rate. The default
is 1ms, but
100us is still reasonable. If the profile changes when using
100us, you were
seeing aliasing.
Or maybe if the function is approximately synchronized to the
sampling
timer?
-- GG
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Rick Altherr
Performance Tools
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