There is a tool (not free) That I have liked that works great with
OMPI, and can use gprof information.
http://www.allinea.com/index.php?page=74
Also I am not sure but Tau (which is free) Might support some gprof
hooks.
http://www.cs.uoregon.edu/research/tau/home.php
Brock Palen
www.umich.edu/~brockp
Center for Advanced Computing
bro...@umich.edu
(734)936-1985
On Apr 22, 2009, at 7:37 PM, jgans wrote:
Hi,
Yes you can profile MPI applications by compiling with -pg.
However, by default each process will produce an output file called
"gmon.out", which is a problem if all processes are writing to the
same global file system (i.e. all processes will try to write to
the same file).
There is an undocumented feature of gprof that allows you to
specify the filename for profiling output via the environment
variable GMON_OUT_PREFIX. For example, one can set this variable in
the .bashrc file for every node to insure unique profile filenames,
i.e.:
export GMON_OUT_PREFIX='gmon.out-'`/bin/uname -n`
The filename will appear as GMON_OUT_PREFIX.pid, where pid is the
process id on a given node (so this will work when multiple nodes
are contained in a single host).
Regards,
Jason
Tiago Almeida wrote:
Hi,
I've never done this, but I believe that an executable compiled
with profilling support (-pg) will generate the gmon.out file in
its current directory, regardless of running under MPI or not. So
I think that you'll have a gmon.out on each node and therefore you
can "gprof" them independently.
Best regards,
Tiago Almeida
---------------------------------
jody wrote:
Hi
I wanted to profile my application using gprof, and proceeded like
when profiling a normal application:
- compile everything with option -pg
- run application
- call gprof
This returns a normal-looking output, but i don't know
whether this is the data for node 0 only or accumulated for all
nodes.
Does anybody have experience in profiling parallel applications?
Is there a way to have profile data for each node separately?
If not, is there another profiling tool which can?
Thank You
Jody
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