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[Sbcl-help] New memory problem?

From: Christopher Laux <christopher.laux@we...> - 2007-04-26 11:24

Hi all,

I've come across another SBCL memory problem that I haven't seen
discussed here yet. Basically Unix utility top tells me that SBCL has
used 95% of available memory (4 GB incl. swap), while a call to (room)
reports that merely a little more than 700 MB are allocated.

I'm sure there's a reasonable explanation for this! Any takers?

Btw, this is on version 1.0.4 on Linux / AMD64 with threads enabled.

Thanks,

Chris Laux

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Thread	Author	Date
[Sbcl-help] New memory problem?	Christopher Laux <christopher.laux@we...>

Re: [Sbcl-help] New memory problem?

From: Pascal Bourguignon <pjb@in...> - 2007-04-26 11:45

Christopher Laux writes:
> Hi all,
> 
> I've come across another SBCL memory problem that I haven't seen
> discussed here yet. Basically Unix utility top tells me that SBCL has
> used 95% of available memory (4 GB incl. swap), while a call to (room)
> reports that merely a little more than 700 MB are allocated.
> 
> I'm sure there's a reasonable explanation for this! Any takers?
> 
> Btw, this is on version 1.0.4 on Linux / AMD64 with threads enabled.

This is overcommited _virtual_ memory.  Beware VIRT vs RES in top.

For example, my 32-bit sbcl has opened a view on virtual memory 863 MB
wide, but really uses only 63 MB of real resident memory (plus some
shared memory for libraries).


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