On 02/19/2015 11:56 AM, Nathan Hjelm wrote:
If you have yama installed you can try:
Nope, I do not have it installed... is it absolutely necessary? (and
would it change something when it fails when I am root?)
Other question: In addition to "--with-cma" configure flag, do we have
to pass any options to "mpicc" when compiling/linking an mpi application
to use cma?
Thanks,
Eric
echo 1 > /proc/sys/kernel/yama/ptrace_scope
as root.
-Nathan
On Thu, Feb 19, 2015 at 11:06:09AM -0500, Eric Chamberland wrote:
By the way,
I have tried two others things:
#1- I launched it as root:
mpiexec --mca mca_btl_vader_single_copy_mechanism cma --allow-run-as-root
-np 2 ./hw
#2- Found this
(http://askubuntu.com/questions/146160/what-is-the-ptrace-scope-workaround-for-wine-programs-and-are-there-any-risks)
and tried this:
sudo setcap cap_sys_ptrace=eip /tmp/hw
On both RedHat 6.5 and OpenSuse 12.3 and still get the same error message!!!
:-/
Sorry, I am not a kernel expert...
What's wrong?
Thanks,
Eric
On 02/18/2015 04:48 PM, Éric Chamberland wrote:
Le 2015-02-18 15:14, Nathan Hjelm a écrit :
I recommend using vader for CMA. It has code to get around the ptrace
setting. Run with mca_btl_vader_single_copy_mechanism cma (should be the
default).
Ok, I tried it, but it gives exactly the same error message!
Eric
-Nathan
On Wed, Feb 18, 2015 at 02:56:01PM -0500, Eric Chamberland wrote:
Hi,
I have configured with "--with-cma" on 2 differents OS (RedHat 6.6 and
OpenSuse 12.3), but in both case, I have the following error when
launching
a simple mpi_hello_world.c example:
/opt/openmpi-1.8.4_cma/bin/mpiexec --mca btl_sm_use_cma 1 -np 2 /tmp/hw
--------------------------------------------------------------------------
WARNING: Linux kernel CMA support was requested via the
btl_vader_single_copy_mechanism MCA variable, but CMA support is
not available due to restrictive ptrace settings.
The vader shared memory BTL will fall back on another single-copy
mechanism if one is available. This may result in lower performance.
Local host: compile
--------------------------------------------------------------------------
Hello world from process 0 of 2
Hello world from process 1 of 2
[compile:23874] 1 more process has sent help message
help-btl-vader.txt /
cma-permission-denied
[compile:23874] Set MCA parameter "orte_base_help_aggregate" to 0 to
see all
help / error messages
After I googled the subject, it seems there is a kernel parameter to
modify,
but I can't find it for OpenSuse 12.3 or RedHat 6.6...
Here is the "config.log" issued from RedHat 6.6...
http://www.giref.ulaval.ca/~ericc/ompi_bug/config.184_cma.gz
Thanks,
Eric
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