Thanks for the reply.
It's not the answer I was hoping for, but I can live with it.
If I can build PHDF5 as dynamic libraries, I should be able to point to the specific version I need at runtime, that way I can (hopefully) be isolated from the differences in MPI versions. Does this sound reasonable?
Has anyone else tried this? If so, did you find that you had to pass different hints to different PHDF5/MPI libraries when reading or writing?
Any other code differences required between different MPI implementations or did PHDF5's MPI-IO driver isolate you from these differences?
Do some MPI implementations perform better than others with PHDF5? If so, under what circumstances?
Sorry for all the questions, but while I'm still evaluating the possibility of this approach, I'm trying to understand what kind of craters I might fall into to better estimate the effort and understand the risks. This is where your collective experience is so valuable to me.
Thanks so much,
Date: Thu, 18 Feb 2010 17:17:59 -0600
Subject: Re: [Hdf-forum] Working with multiple MPI implementations
On Feb 18, 2010, at 4:28 PM, John Powell wrote:Hello,
I'm just starting out with Parallel HDF5 and I've built HDF to use MPICH2 from ANL and it seems to be running successfully on my RedHat Linux 8 processor workstation. This is just one of many software/hardware configurations I will need to support.
My ultimate goal is to use Parallel HDF5 in a product that already provides support for different MPI implementations. We provide the ability to choose which MPI implementation when the product is launched.
Because I needed to specify which MPI implementation before building Parallel HDF5, I'm worried that I may need to rebuild Parallel HDF5 for each MPI implementation we support. Is this true? If not, what steps will be required to switch from one MPI implementation to another?
Would my source code need to be aware of which MPI implementation Parallel HDF5 is using?
Thanks in advance for any responses and if you care to share any advice on using Parallel HDF5, I would be glad to receive it. Thanks,
Unfortunately, I think you are correct in your analysis - you will probably need a different version of HDF5 for each version of MPI. Currently the MPI standard does not specify a binary compatibility requirement, so each MPI implementation may be different enough that the HDF5 library wouldn't work with it.
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