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| author | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2013-06-28 12:30:55 +0300 |
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| committer | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2013-06-28 12:39:55 +0300 |
| commit | 9e0bc7c1e84d7fffb93130f2b7d079a0853329ed (patch) | |
| tree | a1689d931865c74bed16eb431a7606d86acb83fc /src/backend/tcop/postgres.c | |
| parent | 9db4ad44eb02326bbe8eeaf7d1dd452844764a20 (diff) | |
| download | postgresql-9e0bc7c1e84d7fffb93130f2b7d079a0853329ed.tar.gz postgresql-9e0bc7c1e84d7fffb93130f2b7d079a0853329ed.zip | |
Track spinlock delay in microsecond granularity.
On many platforms the OS will round the sleep time to millisecond
resolution, but there is no reason for us to pre-emptively round the
argument to pg_usleep.
When the delay was measured in milliseconds and started from 1 ms, it
sometimes took many attempts until the logic that increases the delay by
multiplying with a random value between 1 and 2 actually managed to bump it
from 1 ms to 2 ms. That lead to a sequence of 1 ms waits until the delay
started to increase. This wasn't really a problem but it looked odd if you
observed the waits. There is no measurable difference in performance, but
it's more readable this way.
Jeff Janes
Diffstat (limited to 'src/backend/tcop/postgres.c')
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