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dump of ULTs stacks only works one time for the same execution context #393

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bfaccini opened this issue Aug 31, 2023 · 2 comments
Open

dump of ULTs stacks only works one time for the same execution context #393

bfaccini opened this issue Aug 31, 2023 · 2 comments

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@bfaccini
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bfaccini commented Aug 31, 2023 •
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Trying to dump ULTs stacks by calling ABT_info_trigger_print_all_thread_stacks() in DAOS code, I have found that this can only be done one time in a same process/execution context.

The reason of such buggy behaviour is that, in ABTI_info_check_print_all_thread_stacks(), a NULL/0 test of the return value of the ABTD_atomic_fetch_sub_int() function, basically doing an atomic_fetch_sub(), applied to the print_stack_barrier atomic variable where the number of previously "parked" XStreams (to stop all ABT-related activity during execution of all ULTs stacks dump in the context of an elected “master” XStream) is used to detect when the print_stack_flag can be reset to PRINT_STACK_FLAG_UNSET to allow for a next dump to be started.

The problem is that 1 should be tested instead of 0, since the atomic_fetch_sub() returned value is the one BEFORE the sub not after !
bfaccini added a commit to bfaccini/argobots that referenced this issue Aug 31, 2023
@bfaccini
info: fix ULTs stacks dump works only once
0c4d79c 
1/one returned value must be tested instead of 0 to
detect that last "parked" XStream is done in
ABTI_info_check_print_all_thread_stacks() and thus
that print_stack_flag can be reset to PRINT_STACK_FLAG_UNSET
to allow for a next dump to be started.

DAOS-14248 ticket, Argobots issue pmodels#393.

Signed-off-by: Bruno Faccini <[email protected]>
@bfaccini bfaccini mentioned this issue Aug 31, 2023
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@bfaccini
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PR-394 should fix.

knard-intel pushed a commit to knard-intel/argobots that referenced this issue May 15, 2024
@kanard38 @bfaccini @knard-intel
info: fix ULTs stacks dump works only once
411e5b3 
1/one returned value must be tested instead of 0 to detect that last
"parked" XStream is done in ABTI_info_check_print_all_thread_stacks()
and thus that print_stack_flag can be reset to PRINT_STACK_FLAG_UNSET to
allow for a next dump to be started.

DAOS-14248 ticket, Argobots issue pmodels#393.

Signed-off-by: Cedric Koch-Hofer <[email protected]>
Co-authored-by: Bruno Faccini <[email protected]>
@knard-intel knard-intel mentioned this issue May 15, 2024
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@knard-intel
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This has been fixed with the PR #397 .
@yfguo , please could you close this ticket.

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