appio with dynamically-linked libpapi

[Nicholas Chaimov]

Hello,

I'm a TAU developer. I've been trying to get the appio component to work with PAPI through TAU. Towards that end, I've been experimenting with the tests in src/components/appio/tests.

The test appio_test_read_write, run as built by the Makefile, prints the expected results:

This program will read /etc/group and write it to /dev/null
----
appio:::OPEN_CALLS: 2
appio:::OPEN_FDS: 0
appio:::READ_CALLS: 9
appio:::READ_BYTES: 7993
appio:::READ_USEC: 14
appio:::READ_ERR: 0
appio:::READ_INTERRUPTED: 0
appio:::READ_WOULD_BLOCK: 0
appio:::WRITE_CALLS: 8
appio:::WRITE_BYTES: 7993
appio:::WRITE_USEC: 6
appio:::WRITE_WOULD_BLOCK: 0

The Makefile builds the test statically linked against libpapi.a. If I instead build it dynamically linked against libpapi.so, then all of the counters are zero:

This program will read /etc/group and write it to /dev/null
----
appio:::OPEN_CALLS: 0
appio:::OPEN_FDS: 0
appio:::READ_CALLS: 0
appio:::READ_BYTES: 0
appio:::READ_USEC: 0
appio:::READ_ERR: 0
appio:::READ_INTERRUPTED: 0
appio:::READ_WOULD_BLOCK: 0
appio:::WRITE_CALLS: 0
appio:::WRITE_BYTES: 0
appio:::WRITE_USEC: 0
appio:::WRITE_WOULD_BLOCK: 0

Does using the appio component require that the application be linked statically against libpapi.a in order to intercept the I/O calls?

Thanks,

Nicholas Chaimov
HPC Computer Scientist
ParaTools, Inc.
1900 Millrace Dr Ste 104
Eugene, OR 97403
(503) 869-8513

[Treece Burgess]

Hello Nicholas,

The appio component should not require the application to be linked statically against libpapi.a to run successfully.

I have been able to reproduce this behavior and am looking further into it.

Best wishes,

Treece

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[Treece Burgess]

Hello Nicholas,

I have created PR #501 that from my testing resolves this issue. If you have time to test this PR to see if it resolves the issue for yourself as well, that would be great.

Best wishes,

Treece

[Phil Mucci]

Hi treece,

What was the fix? 

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[Nicholas Chaimov]

Hi Treece,

I have tested the PR and confirm that it fixes the issue with the test for me. I can also now use this component successfully with TAU.

Thanks!