On May 12, 2010, at 1:01 PM, Fernando Lemos wrote:
> On Wed, May 12, 2010 at 2:51 PM, Jeff Squyres wrote:
>> On May 12, 2010, at 1:48 PM, Hanjun Kim wrote:
>>
>>> I am working on parallelizing my sequential program using OpenMPI.
>>> Although I got performance speedup using many threads, there
On May 12, 2010, at 3:01 PM, Fernando Lemos wrote:
> Please correct me if I'm wrong, but I believe OpenMPI sends
> stdin/stdout from the other ranks back to rank 0 so that the output is
> displayed as the stdin of mpirun and the other way around with
> stdout/stderr. Otherwise it wouldn't be possi
On Wed, May 12, 2010 at 2:51 PM, Jeff Squyres wrote:
> On May 12, 2010, at 1:48 PM, Hanjun Kim wrote:
>
>> I am working on parallelizing my sequential program using OpenMPI.
>> Although I got performance speedup using many threads, there was
>> slowdown on a small number of threads like 4 threads.
On May 12, 2010, at 1:48 PM, Hanjun Kim wrote:
> I am working on parallelizing my sequential program using OpenMPI.
> Although I got performance speedup using many threads, there was
> slowdown on a small number of threads like 4 threads.
> I found that it is because getc worked much slower than s
Hi,
I am working on parallelizing my sequential program using OpenMPI.
Although I got performance speedup using many threads, there was
slowdown on a small number of threads like 4 threads.
I found that it is because getc worked much slower than sequential
version. Does OpenMPI override or wrap ge
