Slow InnoDB performance with many long semaphore waits in buf0buf.c
(Doc ID 1538744.1)
Last updated on FEBRUARY 28, 2020
Applies to:
MySQL Server - Version 4.1 and later
Information in this document applies to any platform.
Symptoms
- Slow InnoDb performance in highly concurrent environment.
- High CPU consumption.
- High value configured for innodb_buffer_pool_size. (On practice more than 32G).
- SHOW ENGINE INNODB STATUS shows many entries in SEMAPHORES section, waiting singe lock in buf0buf.c .
- Value of innodb_buffer_pool_instances is default.
Cause
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In this Document
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