Re: Regarding Oprofile for monitoring sockets API sunctions

[Maynard J. <may...@us...>]

Khan Subayal wrote:
> Dear all,
> 
> I just started to use Oprofile since I have to do run time profiling of
> BSD socket API functions.
> 
> My goal is to draw the cumulative impact .i.e., cache hits, misses and
> load
> of these API functions at run time in context of the process they reside
> in. 
> I mean only that load which is caused by those calls to API functions
> made 
> from within the particular target process.
> 
> Then,
> 
> A separate graph for the whole of process with the same mentioned
> performance 
> concerns.
> 
> Then,
> 
> of all the processes currently scheduled by kernel excluding the one
> under test.
> 
> Is this sampling tool suitable for runtime profiling .i.e., as the
> process is being run these
> graphs are being plotted?
Yes, it should be.  Use 'opcontrol --separate=lib,kernel,thread' when setting up 
the profiler.  You can find good doc at 
http://oprofile.sourceforge.net/doc/index.html.  Pay particular attention to the 
section on "Profile specifications" where the tgid and tid specifications are 
defined.  Note that when tyring to generate a report from profile data collected 
with "separate=thread", opreport will not even try to generate a text-based 
report for *all* threads.  It's just too much data to try to display.  But if 
you specify a particular app binary on the opreport command line, then it will 
generate a report, listing at the top all thread IDs that were running that 
binary.  Then you can use that thread info to generate additional 
thread-specific reports using the "tid:<tid#>" specification.

-Maynard
> 
> Moreover any good manual or tutorial or book for Oprofile?
> 
> 
> Best Regards
> Subayal Aftab Khan
> 
> 
> 
> 
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