Comments on: A quick rundown of per-thread buffers http://themattreid.com/wordpress/2009/04/28/a-quick-rundown-of-per-thread-buffers/ MySQL DBA | Linux'er Thu, 26 Apr 2012 16:12:57 +0000 hourly 1 By: chrisz http://themattreid.com/wordpress/2009/04/28/a-quick-rundown-of-per-thread-buffers/comment-page-1/#comment-93 chrisz Thu, 09 Jul 2009 17:14:43 +0000 http://themattreid.com/wordpress/?p=157#comment-93 If you need to commit that much memory to a buffer, do it in the query :) That's funny a funny cnf. If you need to commit that much memory to a buffer, do it in the query :) That’s funny a funny cnf.

]]> By: admin http://themattreid.com/wordpress/2009/04/28/a-quick-rundown-of-per-thread-buffers/comment-page-1/#comment-81 admin Thu, 30 Apr 2009 14:47:30 +0000 http://themattreid.com/wordpress/?p=157#comment-81 Yes, you *can* overcommit memory and have things be fine up until that memory is actually addressed and the machine starts to swap to disk. That's when things get dirty. If you need to allocate that much ram to your buffers you're better off installing 64GB of ram. Overcommitting memory is never a good idea. Yes, you *can* overcommit memory and have things be fine up until that memory is actually addressed and the machine starts to swap to disk. That’s when things get dirty. If you need to allocate that much ram to your buffers you’re better off installing 64GB of ram. Overcommitting memory is never a good idea.

]]> By: James http://themattreid.com/wordpress/2009/04/28/a-quick-rundown-of-per-thread-buffers/comment-page-1/#comment-80 James Thu, 30 Apr 2009 08:52:02 +0000 http://themattreid.com/wordpress/?p=157#comment-80 Hi Matt. Actually, you can overcommit memory with read_buffer_size and sort_buffer_size and usually have no problems. I have worked on large systems with physical RAM of 16 GB and formula = 64 GB just fine. And those are MyISAM-specific. Also, not sure if read_buffer and read_buffer_size are the same. I believe they are not. Also see this blog post: http://www.mysqlperformanceblog.com/2006/05/17/mysql-server-memory-usage/ James. Hi Matt.

Actually, you can overcommit memory with read_buffer_size and sort_buffer_size and usually have no problems. I have worked on large systems with physical RAM of 16 GB and formula = 64 GB just fine. And
those are MyISAM-specific.

Also, not sure if read_buffer and read_buffer_size are the same. I believe they are not.

Also see this blog post:
http://www.mysqlperformanceblog.com/2006/05/17/mysql-server-memory-usage/

James.

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