Charm++ parallel programming system

[Nitin Bhat <nitin.bhat.k AT gmail.com>]

Hi Ted,

Thanks for letting us know about the issue. We are running megatest with “++ppn 2” during our nightly build and as far I know, we haven’t run into this hang on gni builds (or any build).

I’ll try reproducing it and then debugging it on Cori. 

Could you send your final run command? Are you running make test TESTOPTS=“++ppn 2”? If so, does the hang occur when you run with “+p2” or “+p4”? 

Thanks,

Nitin Bhat

Software Engineer

Charmworks, Inc. 

On Aug 27, 2019, at 12:17 PM, Ted Packwood <malice AT cray.com> wrote:

Hello-
I am trying to resolve a hang I'm seeing on the Cray XC with the
gni-crayxc build.  I'm building with the gcc compiler, and my build
command is:
./build charm++ gni-crayxc persistent smp --with-production

Running megatest with +ppn2 or higher results in an intermittent
megatest hang.  The higher the ppn value, the more likely the hang.
Most of the hangs occur here:
test 43: initiated [multi migration (jackie)]

Could someone from Charm get back to me? 
Thanks much
Ted Packwood
Cray Inc.