If I understand the situation you've described, here's how I see the
expected system usage.
Assumptions:
50M/PDF
Generation takes 1.6X final size (min)
100 simultaneous users
20% memory block fragmentation (typ)
LAMP overhead ~ 1.5G
((50*100*1.6)/0.8) + 1500 = 11500M
11.5G peak memory usage. Depending on your traffic pattern, your typical
usage may well exceed the 2G physical available.
I'd allocate at *least* 4G Swap in that situation, and I'd make sure to
run a 64-bit kernel on a 64-bit CPU (Opteron/Athlon-64/Itanium)
I'd also make *really* sure the app handles an out-of-memory situation
gracefully.
Don Calfa wrote:
> On one server now that's basically LAMP and mail, I have 20 sites
> that reach about 10 Gig a month.
> With 512M, I have any any time about 36M free with 36M used in swap.
>
> The sites I'm moving over have traffic that is about 60G a month and
> the server they're on now is slooooooow.
> I know PDF is a memory hog and I just want to be prepared for about a
> hundred users at a time generating PDF's.
>
>
> Rob Wultsch wrote:
>
>> Hope much total memory are you intending on using? I rather doublt
>> that you would need 4 GB of swap.
>>
>>
>> On Fri, 25 Feb 2005 15:55:23 -0700, Don Calfa
>> <tvat3000@west.ponymail.us> wrote:
>>
>>
>>> Usually the rule of thumb for swap is 2x physical memory (AFAIK)
>>> I'm remembering that there isn't a need for swap larger than 2Gig but
>>> I'm not sure.
>>>
>>> If I install 2 Gig of memory in a server, do I really need 4 Gig of
>>> swap?
>>> ---------------------------------------------------
>>>
>>>
>>
>>
>>
>>
>>
>
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