Subsecond sleep
Barry Smith wrote: Likely, it had sleep() in there and a global search and replace wrongly turned it into a PetscSleep(). My docs for sleep(3) have: RETURN VALUE Zero if the requested time has elapsed, or the number of seconds left to sleep, if the call was interrupted by a signal handler. Presumably the AIX issue was that sleep() was returning without being interrupted. What are the desired semantics for PetscSleep(), I expect it should return early if interrupted, like POSIX sleep()? If sleep() returns early even when not interrupted then I don't see a way for PetscSleep() to return early if it is interrupted but to go for the full time otherwise. The correct fix is to test properly under AIX, but since no one has AIX and it sucks it cannot be tested. Excellent quote. Jed -- next part -- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 261 bytes Desc: OpenPGP digital signature URL: http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20091018/f03da2fc/attachment.pgp
Subsecond sleep
Barry Smith wrote:
It is fine with me to switch the infrastructure to use a PetscReal
instead of integer
Done.
http://petsc.cs.iit.edu/petsc/petsc-dev/rev/5704078f5057
Did PetscSleep() once return the time remaining instead of an error
code? The following can't possibly have worked correctly for a while.
Should it be fixed or removed?
/*
IBM sleep may return at anytime, hence must see if there is more time
to sleep
*/
{
int left = sleeptime;
while (left 0) {left = PetscSleep(left) - 1;}
}
Jed
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Subsecond sleep
I sometimes want to slow down animation with a small problem size and -draw_pause is generally does what I want, but it can only take integer arguments and pausing for a whole second every time is often too much. There are subsecond sleep functions (like usleep and nanosleep) in POSIX, and I've rolled my own micro-sleep command-line option more than once now. Is there a compelling reason not to make -draw_pause and PetscSleep take a real value, thus offering higher resolution when it is available? Jed -- next part -- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 261 bytes Desc: OpenPGP digital signature URL: http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20091016/635b5151/attachment.pgp
Subsecond sleep
No. Matt On Fri, Oct 16, 2009 at 5:02 AM, Jed Brown jed at 59a2.org wrote: I sometimes want to slow down animation with a small problem size and -draw_pause is generally does what I want, but it can only take integer arguments and pausing for a whole second every time is often too much. There are subsecond sleep functions (like usleep and nanosleep) in POSIX, and I've rolled my own micro-sleep command-line option more than once now. Is there a compelling reason not to make -draw_pause and PetscSleep take a real value, thus offering higher resolution when it is available? Jed -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener -- next part -- An HTML attachment was scrubbed... URL: http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20091016/5a7b6488/attachment.html
Subsecond sleep
It is fine with me to switch the infrastructure to use a PetscReal instead of integer Barry On Oct 16, 2009, at 5:02 AM, Jed Brown wrote: I sometimes want to slow down animation with a small problem size and -draw_pause is generally does what I want, but it can only take integer arguments and pausing for a whole second every time is often too much. There are subsecond sleep functions (like usleep and nanosleep) in POSIX, and I've rolled my own micro-sleep command-line option more than once now. Is there a compelling reason not to make -draw_pause and PetscSleep take a real value, thus offering higher resolution when it is available? Jed
