MySQL Bugs: #56358: My cluster used so many swap even if they have enough memory.

Bug #56358	My cluster used so many swap even if they have enough memory.
Submitted:	30 Aug 2010 9:40	Modified:	2 May 2012 11:53
Reporter:	Sean Lee	Email Updates:
Status:	Not a Bug	Impact on me:	None
Category:	MySQL Cluster: Cluster (NDB) storage engine	Severity:	S5 (Performance)
Version:	5.1.44-ndb-7.1.4b-cluster-gpl	OS:	Linux (ubuntu 8.04 64bit 2.6.24-24-server edition)
Assigned to:		CPU Architecture:	Any
Tags:	Memory, swap, SwapCached

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

sysbench output on swappiness = 0

Attachment: no_swap.out (application/octet-stream, text), 15.38 KiB.

sysbench output on swappiness is default 60

Attachment: has_swap.out (application/octet-stream, text), 15.38 KiB.

sysbench output when swappiness is 60 and half ndb size

Attachment: half.out (application/octet-stream, text), 15.38 KiB.