Re: Swap space bandits!

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Alejandro Saez (cano++at++krusty.engr.sgi.com)
Tue, 5 Jan 1999 12:36:39 -0600


On Dec 30, 6:43pm, Jesse Stockwell wrote:
> Subject: Swap space bandits!
> hi.
>
> I'm having some mysterious problems with the swap space on my onyx
> system.
> I'm running on an ONYX with 256M ram and 128M swap space in /dev/swap,
> and 8, 200MHZ processors.
>
Needles to say, 256/8= 32 MB per processor seems awfull low. Tipicaly
recomended swap space: physical memory * 2.5, and you have physical memory* 0.5
I would try to solve this first. One can tweak a bit here and a bit there but
there is a limit.

> I've been trying to load in some fairly large .flt files.
>
> When I load in too many tiles, and enter my pageDBase(), all the
> processors spike out and eventually all the processes are killed off,
> with the message that they've run out of swap space.
> Makes sense to me.
>
> If I query the system while my application is running, and ask it how
> much swap space I'm using up, It usually gives me some piddly
> number.(I'm using "swap -s")Typically just before crashing it will
> tell me I'm using
> 9.33m of swap + 180.3m additional reserved = 189.63m total swap used,
> with 170m of free swap remaining.
> numbers here aren't exact, sometimes it uses more actual swap 30m or
> less actual swap 0.0m
>
> Thats real strange for me.
Well, swap is strange all right, but what's so strange? The fact the numbers
don't add?. To that, I don't know the answer but other than that, it's pretty
clear you have reserved all of your swap space but is not being used (yet). You
can add new swap (swap -a) or activate virtual swap, which given the low
ammount of swap you have and the large files in use , I wouldn't advise to do.
I would really try to get more RAM and then increase the swap space.

>
> I've got another problem along these lines. I was trying to increase
> my shared memory arena size to 512M in the hope that I could load in
> more files. What happens is that it allocates the arena size, but
> gives a SIGCHLD while loading in one of my files. Right now I can load
> in 225 files. When I increase the arena size to 512M, it always bombs
> on file 142.
> I'm checking the shared arena size to see that it's changing to the
> size I requested, and it is...
>
> Any ideas would be greatly appreciated.

There was a thing about arena size posted last year or a couple of years ago.
Check the archives, I think it had a limit under 32bit addressing or something
:)
>
> Jesse
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>-- End of excerpt from Jesse Stockwell

-- 
------------------------------------------------------------------------
Alejandro Saez
Software Engineer
Silicon Chile S.A.
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E-mail: asaez++at++silicon.cl              	Providencia
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