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тАО11-01-2009 05:30 AM
тАО11-01-2009 05:30 AM
Linux: High memory utilisation
Hi,
In one of my linux box consuming high memory.
I have found cache is uilising more. Its a RHEL4 linux.
Please someone help me how to clear cache & how to put threashold to that.
thanks in Advance
In one of my linux box consuming high memory.
I have found cache is uilising more. Its a RHEL4 linux.
Please someone help me how to clear cache & how to put threashold to that.
thanks in Advance
3 REPLIES 3
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тАО11-01-2009 08:34 AM
тАО11-01-2009 08:34 AM
Re: Linux: High memory utilisation
> I have found cache is uilising more.
Perhaps because no one else wants it.
Normally, disk caching software will release
memory if anyone else wants it. Unused
memory does nothing for anyone, so why do you
want more of it?
Perhaps because no one else wants it.
Normally, disk caching software will release
memory if anyone else wants it. Unused
memory does nothing for anyone, so why do you
want more of it?
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тАО11-02-2009 12:56 AM
тАО11-02-2009 12:56 AM
Re: Linux: High memory utilisation
i think this question gets asked 20 times a week. a simple forum search will reveal this and you'll notice the answer to be always the same.
short: it's normal, don't worry about it.
short: it's normal, don't worry about it.
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тАО11-02-2009 04:11 AM
тАО11-02-2009 04:11 AM
Re: Linux: High memory utilisation
All modern OSs have multiple priority "tiers" for memory allocation.
The number and meaning of each allocation tier varies by OS, but in general, it works like this:
Memory used for disk cache is the lowest possible allocation tier. Memory allocation for applications has higher priority than the cache.
If an application requires memory and free memory is not available, the OS simply finds the least-recently-used cache block and re-allocates it to the application.
If the cache is "dirty" (i.e. contains data that is not yet written to disk), the OS just delays the memory-hungry application a little, sends the cache content to disk, then re-allocates the memory to the application that needed it.
Also remember: if your RHEL4 is a 64-bit version, but the software you're running is 32-bit, the software can never allocate more than 4 GB of RAM.
MK
The number and meaning of each allocation tier varies by OS, but in general, it works like this:
Memory used for disk cache is the lowest possible allocation tier. Memory allocation for applications has higher priority than the cache.
If an application requires memory and free memory is not available, the OS simply finds the least-recently-used cache block and re-allocates it to the application.
If the cache is "dirty" (i.e. contains data that is not yet written to disk), the OS just delays the memory-hungry application a little, sends the cache content to disk, then re-allocates the memory to the application that needed it.
Also remember: if your RHEL4 is a 64-bit version, but the software you're running is 32-bit, the software can never allocate more than 4 GB of RAM.
MK
MK
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