I don't know the reasoning for requiring --with-cma to enable CMA but I
am looking at auto-detecting CMA instead of requiring Open MPI to be
configured with --with-cma. This will likely go into the 1.9 release
series and not 1.8.
-Nathan
On Thu, Feb 19, 2015 at 09:31:43PM -0500, Eric Chamberland
Maybe it is a stupid question, but... why it is not tested and enabled
by default at configure time since it is part of the kernel?
Eric
On 02/19/2015 03:53 PM, Nathan Hjelm wrote:
Great! I will add an MCA variable to force CMA and also enable it if 1)
no yama and 2) no PR_SET_PTRACER.
You m
Aurélien, I should also point out your fix has already been applied to
the 1.8 branch and will be included in 1.8.5.
-Nathan
On Thu, Feb 19, 2015 at 02:57:38PM -0700, Nathan Hjelm wrote:
>
> Hmm, wait. Yes. Your change went in after 1.8.4 and has the same
> effect. If yama ins't installed it is
Hmm, wait. Yes. Your change went in after 1.8.4 and has the same
effect. If yama ins't installed it is safe to assume that the ptrace
scope is effectively 0. So, your patch does fix the issue.
-Nathan
On Thu, Feb 19, 2015 at 02:53:47PM -0700, Nathan Hjelm wrote:
>
> I don't think that will fix
I don't think that will fix this issue. In this case yama is not
installed and it appears PR_SET_PTRACER is not available. This forces
vader to assume that CMA can not be used when that isn't always the
case. I think it might be safe to assume that CMA is unrestricted here.
-Nathan
On Thu, Feb 1
Nathan,
I think I already pushed a patch for this particular issue last month. I do not
know if it has been back ported to release yet.
See
here:https://github.com/open-mpi/ompi/commit/ee3b0903164898750137d3b71a8f067e16521102
Aurelien
--
~~~ Aurélien Bouteiller, Ph.D. ~~~
On 02/19/2015 03:53 PM, Nathan Hjelm wrote:
Great! I will add an MCA variable to force CMA and also enable it if 1)
no yama and 2) no PR_SET_PTRACER.
cool, thanks again!
You might also look at using xpmem. You can find a version that supports
3.x @ https://github.com/hjelmn/xpmem . It is a
Great! I will add an MCA variable to force CMA and also enable it if 1)
no yama and 2) no PR_SET_PTRACER.
You might also look at using xpmem. You can find a version that supports
3.x @ https://github.com/hjelmn/xpmem . It is a kernel module +
userspace library that can be used by vader as a singl
On 02/19/2015 02:58 PM, Nathan Hjelm wrote:
On Thu, Feb 19, 2015 at 12:16:49PM -0500, Eric Chamberland wrote:
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 wh
On Thu, Feb 19, 2015 at 12:16:49PM -0500, Eric Chamberland wrote:
>
> 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?)
>
>
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
If you have yama installed you can try:
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
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)
a
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
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).
-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 (Re
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
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