Horton

Fix busy-wait in pgbench, with --rate.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

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Commit: babf18579455e85269ad75e1ddb03f34138f77b6
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2017-10-01T06:34:29Z
Releases: 10.0 
Fix busy-wait in pgbench, with --rate.

If --rate was used to throttle pgbench, it failed to sleep when it had
nothing to do, leading to a busy-wait with 100% CPU usage. This bug was
introduced in the refactoring in v10. Before that, sleep() was called with
a timeout, even when there were no file descriptors to wait for.

Reported by Jeff Janes, patch by Fabien COELHO. Backpatch to v10.

Discussion: https://www.postgresql.org/message-id/CAMkU%3D1x5hoX0pLLKPRnXCy0T8uHoDvXdq%2B7kAM9eoC9_z72ucw%40mail.gmail.com

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src/bin/pgbench/pgbench.c modified +18 −8

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