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тАО09-17-2010 11:32 PM
тАО09-17-2010 11:32 PM
Buffer cache overflow
What is the performance impact if buffer cache overflows?
$ sar -b 2 10
HP-UX B.11.31 U ia64 09/18/10
11:28:37 bread/s lread/s %rcache bwrit/s lwrit/s %wcache pread/s pwrit/s
11:28:39 0 178 100 6 15 61 0 0
11:28:41 0 443 100 9 26 66 0 0
11:28:43 0 65 100 1 4 67 0 0
11:28:45 0 60 100 4 8 56 0 0
11:28:47 0 53 100 10 7 0 0 0
11:28:49 0 73 100 4 14 71 0 0
11:28:51 0 52 100 1 2 50 0 0
11:28:53 0 67 100 7 10 30 0 0
11:28:55 0 52 100 5 4 0 0 0
11:28:57 0 58 100 6 3 0 0 0
Average 0 110 100 5 9 44 0 0
There is anything wrong in the above sar -b output? Fine tuning is required?
Manoj K
Manoj K
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тАО09-18-2010 06:09 AM
тАО09-18-2010 06:09 AM
Re: Buffer cache overflow
That is a good thing. I don't see anything wrong with that. In fact, with all reads coming from cache, your performance will improve since a read from disk is not required.
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тАО09-18-2010 05:11 PM
тАО09-18-2010 05:11 PM
Re: Buffer cache overflow
When you get low on memory vhand starts shrinking buffer cache.
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тАО09-19-2010 12:02 AM
тАО09-19-2010 12:02 AM
Re: Buffer cache overflow
Serer is having 64Gb Memory and kerenel parameter filecache_max & filecache_min set as 1%.
If i increase the value what will be the impact?
Manoj K
Manoj K
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тАО09-19-2010 10:09 AM
тАО09-19-2010 10:09 AM
Re: Buffer cache overflow
You will be able to cache more data.
Are you using a database that can get more benefit from that memory?