| From: | Vlad Marchenko <marchenko(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Merlin Moncure <mmoncure(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: High SYS CPU - need advise |
| Date: | 2012-11-16 00:06:24 |
| Message-ID: | 50A58380.1050003@gmail.com |
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| Thread: | |
| Lists: | pgsql-general |
Tom,
I just checked the version I'm running (9.1.6), and the code is quite
similar (src/backend/storage/lmgr/s_lock.c)
pg_usleep(cur_delay * 1000L);
#if defined(S_LOCK_TEST)
fprintf(stdout, "*");
fflush(stdout);
#endif
/* increase delay by a random fraction between 1X and 2X */
cur_delay += (int) (cur_delay *
((double) random() / (double) MAX_RANDOM_VALUE) +
0.5);
/* wrap back to minimum delay when max is exceeded */
if (cur_delay > MAX_DELAY_MSEC)
cur_delay = MIN_DELAY_MSEC;
-- vlad
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