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10-30-2014 06:04 AM
10-30-2014 06:04 AM
reduce the File Cache in hpux v3
Hi expart,
our production is runnin with HPUX v3. noticed , File Cache size is too high, that is 8 GB where total memory is 24 GB.
we want to reduce the filecache_max and filecache_min to reduce file cache size. please share the steps to do it.
is it ok we only do :
# kctune filecache_max=3%
# kctune filecache_min=2%
please help with details.
Regards,
Morshed.
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10-30-2014 08:41 AM
10-30-2014 08:41 AM
Re: reduce the File Cache in HP-UX 11.31
>please share the steps to do it.
Looks fine but I would reduce filecache_min first.
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11-02-2014 08:06 PM
11-02-2014 08:06 PM
Re: reduce the File Cache in HP-UX 11.31
Hi Dennis,
currently in our applicatoin server default max file cache is 12 GB ( 24 GB total memory). sometime it is using 10GB as file cache. so total system memory utilization become above 90%. can we release file cache somehow without minimizing the size through kernel parameter.
Regards,
Morshed.
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11-03-2014 12:10 AM
11-03-2014 12:10 AM
Re: reduce the File Cache in HP-UX 11.31
>can we release file cache somehow without minimizing the size through kernel parameter?
If you make filecache_min smaller, the kernel will automatically adjust the filecache if the system is under memory pressure.
Note: Using 90% of memory is a good thing, until you start using swap.
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11-11-2014 01:35 AM
11-11-2014 01:35 AM
Re: reduce the File Cache in HP-UX 11.31
Hi,
below is the glance output of my application server. memory utilizaton is 93 % where file cache is 11.4 GB. what to do ? please advice.
Glance 11.00.044 13:41:03 dcpapp01 ia64 Current Avg High
--------------------------------------------------------------------------------
CPU Util SU | 2% 9% 17%
Disk Util F | 2% 2% 2%
Mem Util S SU UF F | 93% 93% 93%
Swap Util U UR R | 29% 29% 29%
--------------------------------------------------------------------------------
Total VM : 3.2gb Sys Mem : 8.7gb User Mem: 2.1gb Phys Mem : 24.0gb
Active VM: 2.7gb Buf Cache: 0mb Free Mem: 1.8gb FileCache: 11.4gb
root@dcpapp01 [/]# kctune filecache_max
Tunable Value Expression Changes
filecache_max 12239650816 Default Auto
Regards,
Morshed.
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11-11-2014 09:14 AM - edited 11-11-2014 10:11 AM
11-11-2014 09:14 AM - edited 11-11-2014 10:11 AM
Re: reduce the File Cache in HP-UX 11.31
>memory utilization is 93% where file cache is 11.4 GB. what to do?
Why do you think there is anything you need to do? You have 1.8 GB free.
What problems do you see?
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11-18-2014 12:45 AM
11-18-2014 12:45 AM
Re: reduce the File Cache in HP-UX 11.31
The filecache_max is at it's default setting. Are you running a file-intensive workload ?
Note that no matter how high you set filecache_max to, chances are you will end up consuming that much of memory. In general, most applications do not need to cache so much of their file data. If you are concerned about memory utilization you can reduce it to a lower value (say 20%).
Generally, in my experience most customers are happy with filecache_max at around 20% or lower