[Darshan-users] how many compilers and MPI libraries can a single build of Darshan support?

[David Shrader]

Hello All,

I've been playing around a lot with Darshan the last couple of days and 
I am currently trying to find out how much a single build of Darshan can 
support in terms of other compilers and MPI libraries. The documentation 
has this statement if Darshan's CC is based on a GNU compiler, " Once 
Darshan has been installed, it should be capable of instrumenting 
executables built with GNU, Intel, and PGI compilers." I have found that 
not only will Darshan work with GNU, Intel, and PGI compilers, it seems 
to work with any version of these compilers (well, any versions that I 
have in production right now) as well as Pathscale compilers. Is this to 
be expected?

For example, I have built Darshan with Open MPI 1.6.4 that was built 
using the GNU system compilers (v4.4.6). This single build of Darshan is 
able to operate on a binary that was built with Open MPI 1.6.4 based on 
the following compilers: gcc 4.6.1, gcc 4.7.0, gcc 4.7.2, intel 
11.1.072, intel 12.1.2, intel 12.1.5, pgi 9.0-3, pgi 10.9, pgi 12.6, pgi 
12.10 and pathscale 4.0. Meaning, I have builds of Open MPI 1.6.4 
compatible with each of these compilers and I use them to build my 
application. No matter what version of Open MPI 1.6.4 I use to compile 
my application, I can get Darshan output from running it through 
libdarshan.so (that was built using Open MPI 1.6.4 based on the system 
GNU compilers). I have done a similar test with mvapich2 1.8. This is 
absolutely amazing to me and I would like to know if it is expected.

A related question to that is what can a single Darshan build support in 
terms of MPI libraries? I have found that my Open MPI 1.6.4 build will 
not support mvapich2 compiled binaries and vice versa. But, I have found 
that my mvapich2 1.8 build supports mvapich2 1.7, 1.8 and 1.9a2 compiled 
binaries. Is this expected as well? Since only Open MPI 1.6.4 runs well 
with Darshan out of the box, I don't have a similar test there.

In short, I am amazed at the field that a single build of Darshan seems 
to be able to support. I'm curious to know if there is any guidance on 
what the expected edges of that field are.

Again, thank you for all of the help!
David

-- 
David Shrader
SICORP, Inc
1350 Central Ave
Suite 104
Los Alamos, NM 87544
David.Shrader at SICORP.com

LANL contact information:

LANL #: 505-664-0996
LANL email: dshrader at lanl.gov