On 12/19/2024 1:43 PM, Cedric Blancher via Cygwin wrote:
On Thu, 19 Dec 2024 at 19:39, Eliot Moss <m...@cs.umass.edu> wrote:
On 12/19/2024 11:38 AM, Cedric Blancher via Cygwin wrote:
Good afternoon!
2 bugs with SCHED_IDLE support in Cygwin 3.6 after SCHED_IDLE support was added:
1. /bin/chrt does not list SCHED_IDLE
$ chrt --max
SCHED_OTHER min/max priority : 0/0
SCHED_FIFO min/max priority : 1/32
SCHED_RR min/max priority : 1/32
2. Prio 0 does not work:
chrt --idle 0 bash -c 'do something' gives an error in Cygwin 3.6, but
works on Linux and other Oses
Ced
I wonder if this note from the man page is relevant:
"Only SCHED_FIFO, SCHED_OTHER and SCHED_RR are part of POSIX 1003.1b Process
Scheduling. The other scheduling attributes
may be ignored on some systems."
Of course is SCHED_IDLE was advertised as being available, this does seem to be
a bug (I see it on my system as well).
I was able to use some commands under WSL (presumably more Linux-y), but none
at all on Cygwin.
https://cygwin.com/git/?p=newlib-cygwin.git;a=commit;h=61c2f075cd55d4a52b4713383f75870c1e416923
added SCHED_IDLE support for Cygwin 3.6. It should work.
Cygwin should support it, but I wonder if chrt (in util-linux) has been updated
in light of the change.
Regards - Eliot Moss
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