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jemalloc is the new hotness for MySQL. We are using it at Facebook (and I know percona/oracle use it for benchmarks and testing as well).

Good benchmark showing the impact of the different options:

http://www.mysqlperformanceblog.com/2012/07/05/impact-of-mem...



That blog makes it look like it and tcmalloc are roughly on-par. Do you think there's any possibility that FB leans toward jemalloc chiefly because the author works there, and the author of tcmalloc works at Google?


Firefox uses jemalloc, too.


Redis as well.




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