Out of memory - but only 500M out of 4GB in use
cfowler at outpostsentinel.com
Tue May 23 21:48:14 CDT 2006
Its stuff in cache. If a program needs it then it will get it.
This may be a benefit:
On Wed, 2006-05-24 at 11:51 +1000, Tony van Lingen wrote:
> I thought that memory allocated as 'cache' was (at least in theory)
> free? How do I prevent the kernel from allocating it? The program memory
> seems to use only 500M..
> There's 2GB swap, virtually all of which is free.
> Mem: 4147196k total, 3058100k used, 1089096k free, 15784k buffers
> Swap: 2096472k total, 43060k used, 2053412k free, 2521072k cached
> 3GB memory is used, but 2.5GB of that is cache...
> David Hubbard wrote:
> >What's the value of your /proc/sys/vm/overcommit_memory
> >With only 50 MB of free memory though, that's cutting
> >it close. How much swap do you have?
> >>-----Original Message-----
> >>From: linux-poweredge-bounces at dell.com
> >>[mailto:linux-poweredge-bounces at dell.com] On Behalf Of Tony van Lingen
> >>Sent: Tuesday, May 23, 2006 8:35 PM
> >>To: poweredge
> >>Subject: Out of memory - but only 500M out of 4GB in use
> >>I'm trying to run various OC4J (oracle java servers) as well
> >>as a couple of Oracle App servers (OAS) on the same box. It
> >>has 4GB RAM in it, 3.5 GB of which is allocated to cache when
> >>3 OAS instances and 1 OC4J instance are running. There's 50M
> >>unallocated memory. When I try to start another OC4J (java
> >>-jar oc4j.jar) it goes and allocated the remaining 50M abd
> >>then reports 'Out of Memory' and apparently hangs.
> >>Anyone knows how to get around this? It also seems to confuse
> >>the oom-kiler which goes and kills parts of the OAS (the
> >>webcache daemon - not good) when the system has "only" 2GB
> >>allocated to cache...
> >>The box is a PE2850, 4GB RAM, 2CPU, RHEL 4 kernel 2.6.9-34 ELsmp.
> >>Tony van Lingen
> >>Tech One Contractor
> >>Information Management
> >>Corporate Development Division
> >>Environmental Protection Agency
> >>Ph: (07) 3234 1972
> >>Fax: (07) 3227 6534
> >>Mobile: 0413 701 284
> >>E-mail: tony.vanlingen at epa.qld.gov.au
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