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Linux pagecache problem

Posted on 2005-03-17
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Last Modified: 2012-08-14
Hi:
We have Redhat AS 3.0 Update 3(2.4.21-20.ELsmp) running on a x86 box. After half an hour of use the memory goes 100% and almost no swap is ever used. The free command shows a lot of memory is used for pagecache. I changed the proc/sys/vm/pagecache, add the entry in /etc/sysctl.conf, and did a /etc/sysctl -p, and changed the inactive_clean_percent to 100, but still no change. Does this parameter work?? Is there any other solution for this.. Thanks in advance.
Mitra
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Question by:amitra123
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by:marxy
ID: 13566083
I think you should not so change this parameter.
Cache memory will be freed when the system will need it.

For example, I use 2G RAM on my desktop.
And free is 10-15% usually.
Cache memory is used to speed up your system work.

So, don't warry of that :-)
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by:amitra123
ID: 13566253
Thanks for your comment. We have a database running on this server and we do not need to cache any data as database caches it in in its bufferpool. Oracle recommends to change this parameter. The present setting is 1 2 7.

I do not care as long as the database works fine, but it is annoying(Does not feel good when you see 100% of 4 GB ram is used). My question is what this /proc/sys/vm/pagecache is for?? Certainly it has no visible effect.

Thanks for your help.
Mitra
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marxy earned 2000 total points
ID: 13567349
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