While trying to run LAM jobs on my dual core laptop I was facing
problems and was looking for some debugging sugesstions.
Symptoms:
Single cpu jobs run fine (even give me the correct answers with some
test scripts) BUT dual cpu jobs keep running on single cpus. Same if I
try higher "oversubscribed" runs.
recon and lamboot give no errors.
lamnodes shows a single node but with 2 cpus.
I start with:
lamboot -d -v bhosts
bhosts:
x.x.x.y
x.x.x.y
(where x.x.x.y is my IP address)
What could be going wrong if lamnodes shows 2 cpus but my mpicode
still runs on one
THe code is in C and compiled with mpicc. I invoke it with:
mpirun -np 2 foocode
Any suggestions what I should be looking for? [Also, just to make sure
my C code was not buggy I ran it on another well-tested server and
there it ran fine for all numbers of CPUs. So the problem seems to be
in the way I have set up this particular architecture]
Of course, if it helps I can post my C code or any other files too.
--
Rahul
|
