MySQL Bugs: #15815: Very poor performance with multiple queries running concurrently

Bug #15815	Very poor performance with multiple queries running concurrently
Submitted:	16 Dec 2005 23:18	Modified:	19 Jun 2010 0:01
Reporter:	Peter Zaitsev (Basic Quality Contributor)	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: InnoDB storage engine	Severity:	S2 (Serious)
Version:	4.0.27,4.1, 5.0, 5.1	OS:	Linux (Linux x86_64)
Assigned to:	Sunny Bains	CPU Architecture:	Any

File:	Maximum allowed size is 50MB.
Description:
Privacy:

If the data you need to attach is more than 50MB, you should create a compressed archive of the data, split it to 50MB chunks, and upload each of them as a separate attachment.

To split a large file:

On *nix platforms use the split command e.g. split -b 50MB <my_large_archive> <my_split_archive_prefix>
On windows use WinZip or a similar utility to split the large file

Script to test MySQL performance on a multiple CPU server

Attachment: test_parallel.tcl (application/octet-stream, text), 4.73 KiB.

Table structures used in test multiple CPUs

Attachment: tables.sql (text/plain), 1.51 KiB.