in the 1.7, 1.8 and 1.10 series ROMIO remains the default. In the
upcomgin 2.x series, OMPIO will be the default, except for Lustre file
systems, where we will stick with ROMIO as the primary resource.
Regarding performance comparison, we ran numerous tests late last year
and early this year. It really depends on the application scenario and
the platform that you are using. If you want to know which one should
you use, I would definitely suggest to stick with ROMIO in the 1.10
series, since many of the bug fixes of OMPIO that we did in the last two
years could not be back-ported to the 1.10 series for technical reasons.
If you plan to switch to the 2.x series, it might be easiest to just run
a couple of tests and compare the performance for your application on
your platform, and base your decision on that.
Edgar
On 5/10/2016 6:32 AM, Sreenidhi Bharathkar Ramesh wrote:
Hi,
1. During default build of OpenMPI, it looks like both ompio.la
<http://ompio.la> and romio.la <http://romio.la> are built. Which I/O
MCA library is used and based on what is the decision taken ?
2. Are there any statistics available to compare these two - OMPIO vs
ROMIO ?
I am using OpenMPI v1.10.1.
Thanks,
- Sreenidhi.
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