tacme: increase timer resolution to 10ms - plan9port - [fork] Plan 9 from user space
HTML git clone git://src.adamsgaard.dk/plan9port
DIR Log
DIR Files
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DIR README
DIR LICENSE
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DIR commit 6400c9f20c3cdab491cd2aec29cfd2ae632d5046
DIR parent 113ea95f7b3b8f2af5e57214fe752c187d35aa19
HTML Author: Russ Cox <rsc@swtch.com>
Date: Tue, 3 Jun 2014 00:09:29 -0400
acme: increase timer resolution to 10ms
We ran for a long time with 10ms kernel resolution,
so 10ms user space resolution here should be fine.
Some systems actually provide 1ms sleeps, which
makes this polling use a bit more cpu than we'd like.
Since the timers are for user-visible things, 10ms should
still be far from noticeable.
Reduces acme's cpu usage on Macs when plumber is missing
(and plumbproc is sleeping waiting for it to appear).
LGTM=aram, r
R=r, aram
https://codereview.appspot.com/99570043
Diffstat:
M src/cmd/acme/time.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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DIR diff --git a/src/cmd/acme/time.c b/src/cmd/acme/time.c
t@@ -50,7 +50,7 @@ timerproc(void *v)
nt = 0;
old = msec();
for(;;){
- sleep(1); /* will sleep minimum incr */
+ sleep(10); /* longer sleeps here delay recv on ctimer, but 10ms should not be noticeable */
new = msec();
dt = new-old;
old = new;