I have used vprof, which is free, and also works well with openmpi:
http://sourceforge.net/projects/vprof/
One might need slight code modifications to get output, depending on
compilers used, such as adding
vmon_begin();
to start profiling and
vmon_done_task(rank);
to end profiling where rank is the MPI rank integer.
vprof can also use papi, but I have not (yet) tried this.
Daniel Spångberg
Den 2009-04-23 02:00:01 skrev Brock Palen <bro...@umich.edu>:
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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Daniel Spångberg
Materialkemi
Uppsala Universitet
