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Old 05-19-2005, 08:15 AM   #1
Registered: Jul 2004
Location: Berlin
Distribution: fedora 3
Posts: 79

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telling linux to use not ram but swap ?

hi everybody,

i have a huge problem:

i have a big database (17 GB) and a query-script in perl. the machine on which the database is running has only 1 GB RAM. if i do a query via the perl script, the result set i get is always bigger than 1 GB and i get the error message:

>> out of memory

i have searched cpan for a modul with which i can tell perl not use the ram but the swap partition , but i didnt find anything

is there a way i can tell linux:
"if a running script causes a running out of memory, use the swap partition instead of the ram"?

thx for any help
Old 05-19-2005, 11:36 AM   #2
Registered: Apr 2005
Distribution: LFS 5.0 and 6.1
Posts: 705

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I never get this message (out of memory), and I do alot of Graphics work, and the swap is used automagically when needed...................

How big is your swap partition??
Old 05-19-2005, 11:50 AM   #3
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Registered: Nov 2004
Location: San Jose, CA
Distribution: Ubuntu
Posts: 8,507

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As far as applications are concerned, there is no difference between ram and swap. It is all mapped to the same virtual addressing space.
Old 05-19-2005, 12:26 PM   #4
Senior Member
Registered: Feb 2004
Location: Somerset, England
Distribution: Slackware 10.2, Slackware 10.0, Ubuntu 9.10
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Is your swap partition actually active? If you type:
does it include swap?
Old 05-19-2005, 01:15 PM   #5
Registered: Sep 2003
Location: United States
Distribution: Slackware 10.1, Debian 3.0, WinXProSP1, Fedora Core 3
Posts: 425

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Else, do:

dd if=/dev/zero of=swap0 bs=1000000 count=1
makeswap swap0
swapon swap0

That will automatically start working in swap when memory nearly runs out.

--Abid Kazmi
Old 05-19-2005, 05:28 PM   #6
Registered: Mar 2005
Location: New York
Distribution: FC3
Posts: 39

Rep: Reputation: 15
Try reading through this article.

It tells you how to use more ram rather than hard disk and the other way around i.e more hard disk and less ram.


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