InnoDB Plugin 1.0 for MySQL 5.1 User's Guide  /  Third-Party Software  /  Performance Patches from Google

A.1. Performance Patches from Google

Innobase Oy gratefully acknowledges the following contributions from Google, Inc. to improve InnoDB performance:

  • Replacing InnoDB's use of Pthreads mutexes with calls to GCC atomic builtins, as discussed in Section 7.2, “Faster Locking for Improved Scalability”. This change means that InnoDB mutex and rw-lock operations take less CPU time, and improves throughput on those platforms where the atomic operations are available.

  • Controlling master thread I/O rate, as discussed in Section 7.10, “Controlling the Master Thread I/O Rate”. The master thread in InnoDB is a thread that performs various tasks in the background. Historically, InnoDB has used a hard coded value as the total I/O capacity of the server. With this change, user can control the number of I/O operations that can be performed per second based on their own workload.

Changes from the Google contributions were incorporated in the following source code files: btr0cur.c, btr0sea.c, buf0buf.c, buf0buf.ic, ha_innodb.cc, log0log.c, log0log.h, os0sync.h, row0sel.c, srv0srv.c, srv0srv.h, srv0start.c, sync0arr.c, sync0rw.c, sync0rw.h, sync0rw.ic, sync0sync.c, sync0sync.h, sync0sync.ic, and univ.i.

These contributions are incorporated subject to the conditions contained in the file COPYING.Google, which are reproduced here.

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