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* [Bug libgomp/63700] New: Is is impossible to set the OpenMP stack size from inside a program
@ 2014-10-31 15:17 walter.zimmer at dlr dot de
2014-10-31 15:34 ` [Bug libgomp/63700] It " Joost.VandeVondele at mat dot ethz.ch
2024-06-04 11:22 ` walter.zimmer at dlr dot de
0 siblings, 2 replies; 3+ messages in thread
From: walter.zimmer at dlr dot de @ 2014-10-31 15:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63700
Bug ID: 63700
Summary: Is is impossible to set the OpenMP stack size from
inside a program
Product: gcc
Version: 4.9.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgomp
Assignee: unassigned at gcc dot gnu.org
Reporter: walter.zimmer at dlr dot de
CC: jakub at gcc dot gnu.org
We have a binary which uses a lot of stack due to external libray we have no
control over. Single threaded, this is no problem, setrlimit() works fine. But
for OpenMP, setting OMP_STACKSIZE seems to be the only option so set the stack
size for OpenMP threads.
Unfortunately, it can't be set from within the program, as the libgomp code is
always executed before the main program code. We also tried __attribute__
((constructor)) and section(".init"), but for shared links, the libgomp code is
always called before we can set rlimit or OMP_STACKSIZE (nice to see with
OMP_DISPLAY_ENV).
We really want to avoid having external dependencies, so we try to avoid having
to set external environment variables.
Having a small routine which sets the OpenMP internal stack size before the
first threads are created would solve this problem. Such a routine is not
specified in the standard, but it might be implemented as a gomp routine to
account for that.
Or did I miss something? Is this behaviour maybe intentional? What would be the
best solution to set the OpenMP stack size inside a program?
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug libgomp/63700] It is impossible to set the OpenMP stack size from inside a program
2014-10-31 15:17 [Bug libgomp/63700] New: Is is impossible to set the OpenMP stack size from inside a program walter.zimmer at dlr dot de
@ 2014-10-31 15:34 ` Joost.VandeVondele at mat dot ethz.ch
2024-06-04 11:22 ` walter.zimmer at dlr dot de
1 sibling, 0 replies; 3+ messages in thread
From: Joost.VandeVondele at mat dot ethz.ch @ 2014-10-31 15:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63700
Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |Joost.VandeVondele at mat dot ethz
| |.ch
--- Comment #1 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> ---
This would indeed be useful, or as an alternative, something that sets the
default stacksize of threads at compile time.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug libgomp/63700] It is impossible to set the OpenMP stack size from inside a program
2014-10-31 15:17 [Bug libgomp/63700] New: Is is impossible to set the OpenMP stack size from inside a program walter.zimmer at dlr dot de
2014-10-31 15:34 ` [Bug libgomp/63700] It " Joost.VandeVondele at mat dot ethz.ch
@ 2024-06-04 11:22 ` walter.zimmer at dlr dot de
1 sibling, 0 replies; 3+ messages in thread
From: walter.zimmer at dlr dot de @ 2024-06-04 11:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63700
--- Comment #3 from Walter Zimmer <walter.zimmer at dlr dot de> ---
Still, we're looking for a way to accomplish this. Any news? I didn't see
anything concerning stack size in the current OpenMP docs.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2024-06-04 11:22 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2014-10-31 15:17 [Bug libgomp/63700] New: Is is impossible to set the OpenMP stack size from inside a program walter.zimmer at dlr dot de
2014-10-31 15:34 ` [Bug libgomp/63700] It " Joost.VandeVondele at mat dot ethz.ch
2024-06-04 11:22 ` walter.zimmer at dlr dot de
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