High-resolution timer issues
James E Keenan
jkeen at verizon.net
Thu Sep 10 23:44:37 UTC 2009
config/gen/platform/win32/hires_timer.c were committed to trunk on Sep
06 in r41081 when the 'pluggable_runcore' branch was merged to trunk.
config/gen/platform/darwin/hires_timer.c was added a few hours later in
r41087 in an attempt to cope with Darwin-specific problems. More and
more I think that there are problems with this implementation.
See the following two Trac tickets:
https://trac.parrot.org/parrot/ticket/985#comment:3 and following
comments. Andy Dougherty cites a number of problems or limitations of
https://trac.parrot.org/parrot/ticket/989#comment:5, where I report
SIGNAL 10 (SIGBUS) errors on Darwin/PPC subsequent to the introduction
of darwin/hires_timer.c. I thought they had cleared up, but then I
noticed other Smolder reports with the same problem. While these errors
are intermittent, a look at our Smolder reports for Darwin suggest that
they are happening more often than not. I don't have any expertise in
either high-resolution timing or diagnosis of bus errors, so I've done
as much as I can on this ticket.
"Stability!" is supposed to be our theme of the week, especially leading
into Tuesday's release. But this is clearly an area of instability.
I'm hoping that posting to the list because I fear that if these
problems are not treated by Tuesday they will then simply get swept
under the rug in the rush to merge in the next big branch.
Thank you very much.
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