l?? is it the right way?? thanks
>
>
> Roswan Ismail,
> FSKIK,
> Universiti Pendidikan Sultan Idris,
> Tanjong Malim, Perak, Malaysia.
> iewa...@gmail.com
> ros...@fskik.upsi.edu.my
>
> From: George Bosilca
> To: Open MPI Developers
> Sent: Tuesday, April
ers
Sent: Tuesday, April 3, 2012 9:06 PM
Subject: Re: [OMPI devel] algorithm selection in open mpi
Of course !!! ;)
First set coll_tuned_use_dynamic_rules to 1, and then use
coll_tuned_dynamic_rules_filename to specify a file containing the selection
logic. This is kind of tricky to write, s
Of course !!! ;)
First set coll_tuned_use_dynamic_rules to 1, and then use
coll_tuned_dynamic_rules_filename to specify a file containing the selection
logic. This is kind of tricky to write, so we don't advertise it to widely. I
added an example below, contact me privately if you need more i
Is there a way to specify collective depending on the size of the message
and number of processes?
Regards,
Pavel Mezentsev
2012/4/3 George Bosilca
> Roswan,
>
> There a re simpler solutions to achieve this. We have a built-in mechanism
> to select a specific collective implementation. Here is
Roswan,
There a re simpler solutions to achieve this. We have a built-in mechanism to
select a specific collective implementation. Here is what you have to add in
your .openmpi/mca-params.conf (or as MCA argument on the command line):
coll_tuned_use_dynamic_rules = 1
coll_tuned_bcast_algorithm
Performance depends on the network topology & node hardware, and the
benchmark - so we don't have enough information to determine the root
of the issue...
However, you can do some debugging on your end (once you master the
techniques you will be able to debug all sorts of performance problems
- no
Hi all..
I am Roswan Ismail from Malaysia. I am focusing on MPI
communication performance on quad-core cluster at my university. I used Open
MPI-1.4.3 and measurements were done using scampi benchmark.
As I know, open MPI used multiple algorithms to broadcast
data (MPI_BCAST) such as binomial,
