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SubjectRe: Avoiding OOM on overcommit...?
Date
On Mon, 20 Mar 2000, David Whysong wrote:
>On Mon, 20 Mar 2000, Jesse Pollard wrote:
>
>>Without overcommit:
>> You can support 100 simultaneous connections, with full saturation of
>> each server, with no failures.
>>
>> Result: happy customers, happy management, maybe even a raise.
>>
>>If you overcommit:
>> You might support 100 simultaneous connections, but not full saturation
>> of each server, without aborting some connections or crashing the
>> server/system.
>>
>> Result: some unhappy customers, not so happy management, difficulty
>> in identifying problems, and definitely no raise.
>>
>>So you used 2G byte of swap - I know where you can by 18GB of swap for about
>>$300 US...
>
>That's very misleading. In fact if you give the overcommitted system the
>same amount of VM, it will work just fine.
>
>In other words, turning off overcommit isn't what saves you. You added
>more memory!

I guaranteed that the memory allocated could be used. I didn't just add
more memory. Just adding more memory will still allow the system to fail,
it may take longer, it may not happen as often. But it can still happen.

The quotas prevent someone from exceeding what is really alloted to the
job. If the job exceeds that quota then something is wrong, it gives a
control point, AND it prevents the "something wrong" from affecting the
rest of the system.
-------------------------------------------------------------------------
Jesse I Pollard, II
Email: pollard@cats-chateau.net

Any opinions expressed are solely my own.

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