Hello,
Is it possible to efficiently poll for both incoming messages and
request completion using only one thread? As far as I know, busy
waiting with alternate MPI_Iprobe and MPI_Testsome calls is the only
way to do this. Is that approach dangerous to do performance-wise?
Background: my applic
The attached program illustrates the problem. It forks, and the child
calls MPI_Init. This works fine unless I'm inside gdb. Inside gdb,
MPI_Init silently crashes.
I'm using OpenMPI 1.6.0 on Mac 10.8.2. I'm running the program
directly, not through mpirun.
Any ideas what might be wrong?
Than
6.4 in case it's a bug in 1.6.0
>
>
> On Feb 21, 2013, at 3:18 PM, Geoffrey Irving wrote:
>
>> The attached program illustrates the problem. It forks, and the child
>> calls MPI_Init. This works fine unless I'm inside gdb. Inside gdb,
>> MPI_Init silentl
uot;...Reading symbols for shared
> libraries ... done
>
> (gdb) r
> Starting program: /Volumes/RHCHD/rhc/openmpi/v1.6/fork-bug
> Reading symbols for shared libraries ++. done
> child status = 0
>
> Program exited normally.
> (gdb)
>
> Af
ot;, but no message output. My guess is
> that the I/O is being lost for some reason.
>
> On Feb 21, 2013, at 4:09 PM, Geoffrey Irving wrote:
>
>> Actually, I don't see it printing "We're an MPI program!" under gdb,
>> which means it isn't
21, 2013 at 4:38 PM, Geoffrey Irving wrote:
> No, I don't really have any idea what it's doing. You have to add
> manual sleeps and attach another instance of gdb if you want to step
> through the child, since I also can't get follow-fork-mode child to
> work. I only tried
mode child (should do the trick).
>
> For more info: http://sourceware.org/gdb/onlinedocs/gdb/Forks.html
>
> George.
>
> On Feb 22, 2013, at 19:55 , Geoffrey Irving wrote:
>
>> No luck with gdb 7.5.1. I can get it to run, but it hits an internal
>> error and bai
Hello,
LAM had a preprocessor symbol LAM_VERSION giving its version. Open MPI
appears to have this only in Fortran. It would be great if you could
add the version symbols in a C++ include file. This is useful since it
allows me to check whether the installed version of open mpi is the same
as t
