Sorry for the delay in replying to this -- if normal users can't
create mmaped shared memory files, then our shared memory ("sm")
device will fail. I'm afraid I don't know much about OpenSSI --
perhaps they have some specific restrictions about mmaped files...?
On Jan 21, 2007, at 9:17 PM
Hi Ralph and Jeff,
Thanks a lot for the advice. Our cluster setup is pretty "limited", it is an
OpenSSI cluster with several P3 and P4 machines connected through Ethernet.
So I guess we won't be able to take full speed advantage of the current OMPI
implementation.
So far I narrowed down the prob
What that parameter does is turn ³off² all of the transports except tcp so
the problem you¹re seeing goes away because we no longer try to create the
shared memory file. This will somewhat hurt your performance, but it will
work.
Alternatively, you could use ³--mca btl ^sm², which would allow yo
Two things:
1. You will definitely need to also specify the "self" BTL.
Otherwise, if you have an MPI process that tries to send to itself,
there will be no [internal OMPI] path for that message to follow, and
an MPI exception will occur.
mpirun --mca btl tcp,self -np 2 tut01
2.
Just to answer my own question, after I explicitly specify the "--mca btl
tcp" parameter, the program works. So I will need to issue command like
this:
$ mpirun --mca btl tcp -np 2 tut01
oceanus:Hello world from 0
oceanus:Hello world from 1
Regards,
Eddie.
On 1/18/07, eddie168 wrote:
Hi Ra
Hi Ralph and Brian,
Thanks for the advice, I have checked the permission to /tmp
drwxrwxrwt 19 root root 4096 Jan 18 11:38 tmp
which I think there shouldn't be any problem to create files there, so
option (a) still not work for me.
I tried option (b) which set --tmpdir on command line and
errno 13 on Linux is EACCESS. According to the man page, ftruncate()
only retrns errno 13 if the file is owned by another user. I can't
see exactly how this could occur, but you might want to look at /tmp/
and make sure everything in openmpi-sessions-eddie* is owned by user
eddie.
Bri
Hi Eddie
Open MPI needs to create a temporary file system what we call our ³session
directory² - where it stores things like the shared memory file. From this
output, it appears that your /tmp directory is ³locked² to root access only.
You have three options for resolving this problem:
(a) you
Dear all,
I have recently installed OpenMPI 1.1.2 on a OpenSSI cluster running Fedora
core 3. I tested a simple hello world mpi program (attached) and it runs ok
as root. However, if I run the same program under normal user, it gives the
following error:
[eddie@oceanus:~/home2/mpi_tut]$ mpirun -
