On May 19, 2011, at 9:46 PM, Larry Baker wrote:
> I inquired the same of PGI. Dave Borer, PGI Customer Service Manager,
> responded:
>
>> I believe -fast and -fastsse are identical for 64-bit compilers, but there
>> are some differences
>> with 32-bit compilers. I don't think TCP/IP based
Jeff,
Thanks for your reply.
I inquired the same of PGI. Dave Borer, PGI Customer Service Manager,
responded:
I believe -fast and -fastsse are identical for 64-bit compilers,
but there are some differences
with 32-bit compilers. I don't think TCP/IP based MPI routines have
better
On May 18, 2011, at 8:32 PM, Larry Baker wrote:
> The PGI compilers have a -fast and a -fastsse option. Does OpenMPI make
> effective/safe use of SSE instructions (block moves maybe?)?
Not really. The biggest thing that we do that can take advantage of vector
instructions is memcpy,
The PGI compilers have a -fast and a -fastsse option. Does OpenMPI
make effective/safe use of SSE instructions (block moves maybe?)? On
their web site, PGI uses -fast in their examples for OpenMPI rather
than -fastsse. I don't know why.
Larry Baker
US Geological Survey
650-329-5608
