[GTALUG] optimum swap size

[Gary]

I suspect you use vmstat to determine the swap usage (?)
/gary

On 19-02-27 01:14 PM, Dave Collier-Brown via talk wrote:
>
> Linux is somewhat unusual in that it dynamically kills large processes 
> when it's running out of memory. You used to have to set limits to get 
> that behavior. Because of it, I run a moderately large swap (~8 GB) 
> and can watch large jobs drive swap usage up. Then /*I*/ decide if I 
> want them dead.
>
> --dave
>
> On 2019-02-27 10:38 a.m., Stewart C. Russell via talk wrote:
>> On 2019-02-27 10:02 a.m., Gary via talk wrote:
>>> I have kubuntu 18.04 with 20 gigs ram. Does anyone know what the optimum
>>> size swap area that I should have?
>> I asked a question about this at a GTALUG Q&A a few years back.
>> Basically what I remember was:
>>
>> * are you frequently running out of memory? If not, don't change anything.
>>
>> * depending on what applications you're running, there are various
>> kernel parameters that govern swap behaviour. They're tuned for
>> "typical" performance.
>>
>> * The OOM killer (out-of-memory process killer) can sometimes kill a
>> task that's taking up what it thinks is too much memory. I sometimes get
>> that with very large (or very badly thought out) OpenSCAD renders, and
>> it can be annoying to have to work round it. OOM killer exists to keep
>> the system stable, and doesn't care if your work isn't happening.
>>
>> Swap is more of a thing on smaller machines such as a Raspberry Pi.
>> These days, you've always got enough memory + swap until you find that
>> one job for which you don't. For me, that was trying to build MySQL (for
>> someone else, I promise!) on a Raspberry Pi.
>>
>> cheers,
>>   Stewart
>>
>>
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> -- 
> David Collier-Brown,         | Always do right. This will gratify
> System Programmer and Author | some people and astonish the rest
> dave.collier-brown at indexexchange.com  |              -- Mark Twain
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