Steel Bank Common Lisp

Michael Hannemann wrote on Fri, Mar 20, 2009 at 03:21:20PM -0400: 
> Hi there,
> 
> Apologies if this is a FAQ, although I searched the web and did not 
> see anything immediately apropos.
> 
> I seem to get the following error fairly often, when running my program:
> 
> ---
> fatal error encountered in SBCL pid 2226(tid 46912496231472):
> An mprotect call failed with ENOMEM. This probably means that the 
> maximum amount
> of separate memory mappings was exceeded. To fix the problem, either increase
> the maximum with e.g. 'echo 262144 > /proc/sys/vm/max_map_count' or recompile
> SBCL with a larger value for GENCGC-PAGE-SIZE in 'src/target/parms.lisp'.

At work we have SBCL compiled with a larger *backend-page-bytes* (same
thing) for this reason.

I couldn't observe a real performance difference.

I think we might want to bump the default in mainline SBCL.  We use 32
KB.

Martin
-- 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Martin Cracauer <cracauer@...>   http://www.cons.org/cracauer/
FreeBSD - where you want to go, today.      http://www.freebsd.org/

Michael Hannemann <mrh3@...> writes:
> http://article.gmane.org/gmane.lisp.steel-bank.general/2185/match=enomem
> 
> I don't see the string "GENCGC-PAGE-SIZE" appearing anywhere in the 
> SBCL 1.0.25 source, except for in that linux warning message.

Sorry, the variable was renamed at some point after that error message
was added, and the error wasn't updated. Fixed in 1.0.26.11.

-- 
Juho Snellman