https://www.percona.com/blog/2012/07/05/impact-of-memory-allocators-on-mysql-performance/
https://suniphrase.wordpress.com/2015/10/27/jemalloc-vs-tcmalloc-vs-dlmalloc/
中文
http://www.360doc.com/content/13/0915/09/8363527_314549128.shtml