Focus on cumulative load a set of functions in an application

[Khan Subayal]

Dear all,

I just started to using valgrind. I want some guidance,…May be the mail is too long J

My goal is to get the overall or cumulative impact of a set of functions in an

application, I mean the overall %age of contribution of functions group to the

total workload of application. In fact each one of these functions is a wrapper

of a BSD socket API function.

I have to profile streaming applications and the problem is that Kcachegrind does

not show the contribution of BSD socket API functions , may be it is because valgrind does not go

all the way down there.Is there any alternative to valgrind +Kcachegrind  

that could give nice graphs with relative costs of individual functions in the call tree

BUT ALSO SUPPORTING SYSTEM CALLS (Socket API FUNCTIONS) ?

I saw some profilers like Systemtap and Dtrace BUT, are they going to give me the

load measures at this fine level of granularity, I got the impression after preliminary reading

that it is not the case for  systemtap atleast.

Best Regards

Subayal Aftab Khan

----------------------------------------

Subayal Aftab Khan

Research Scientist, M.Sc.

VTT Technical Research Centre of Finland

P.O. BOX 1100, FI-90571 Oulu, Finland. 

Email  : subayal.khan@...

Phone  : [phone]

Mobile : [phone]

----------------------------------------

------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Valgrind-users mailing list
Valgrind-users@...
https://lists.sourceforge.net/lists/listinfo/valgrind-users

On Tuesday 20 October 2009, Khan Subayal wrote:

> Dear all,
>
> I just started to using valgrind. I want some guidance,...May be the
> mail is too long :-)
>
> My goal is to get the overall or cumulative impact of a set of functions
> in an
> application, I mean the overall %age of contribution of functions group
> to the
> total workload of application. In fact each one of these functions is a
> wrapper
> of a BSD socket API function.
>
> I have to profile streaming applications and the problem is that
> Kcachegrind does
> not show the contribution of BSD socket API functions , may be it is
> because valgrind does not go
> all the way down there.Is there any alternative to valgrind +Kcachegrind

Valgrind profiling tools only see what is happening inside the user level part of
a process. I assume you want to see the impact of your socket I/O. This is not
easy, as I/O requests usually are put into queues, and I/O happens asynchroneously
while the CPU can do other things. The best bet is to use a systemwide sampling
tool. For Linux e.g. OProfile or the the newer Perf Events infrastructure supported
since 2.6.31. I have it on my TODO to write an import filter for perf.data in
KCachegrind... but ASCII output given by "perf report" should do, too.

Cheers,
Josef



------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Valgrind-users mailing list
Valgrind-users@...
https://lists.sourceforge.net/lists/listinfo/valgrind-users