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speed up my_timer_init()

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I run perf top during ./mtr testing and constantly see times()
function there. It's so slow, that it has no sense to run it
in a loop too many times.

This patch speeds up -suite=innodb for me from 218s to 208s.
9s of times() function!
This commit is contained in:
Eugene Kosov 2020-07-29 08:17:57 +03:00
parent 3c3f172f17
commit 8ec877f40a
1 changed files with 4 additions and 0 deletions
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4
mysys/my_rdtsc.c
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@ -812,7 +812,11 @@ void my_timer_init(MY_TIMER_INFO *mti)
time1= my_timer_cycles();
time2= my_timer_ticks();
time3= time2; /* Avoids a Microsoft/IBM compiler warning */
#if defined(HAVE_SYS_TIMES_H) && defined(HAVE_TIMES)
for (i= 0; i < 1000; ++i)
#else
for (i= 0; i < MY_TIMER_ITERATIONS * 1000; ++i)
#endif
{
time3= my_timer_ticks();
if (time3 - time2 > 10) break;