Subject: Re: GENCGC-PAGE-SIZE maxed out?
Date: Thursday 20th November 2008 08:12:34 UTC (over 8 years ago)
On Jueves 20 Noviembre 2008, Benjamin Lambert wrote: > Dear SBCL people, > > I use SBCL frequently at Carnegie Mellon. We use it mostly for our > knowledge representation system, Scone, developed by Scott Fahlman, > an old CMUCL Lisper. > > I recently came across a new problem, and I'm not seeing anything in > the mailing list history. > > We're running on an x86-64 Linux machine with 8GB of RAM. One person > in our group was getting error #1 below when he used more than around > 1GB of memory. So, I tried recompiling SBCL (1.0.22) a few times > with greater values for GENCGC-PAGE-SIZE. Each time I increased it, > he'd get error #1 eventually, each time after more memory had been > used. After bumping this up to 32768, he was getting error #1 at > around 6GB of RAM used. > > I tried increasing it once more, first to 64k, then back down to > 49152. When I compile with GENCGC-PAGE-SIZE set to either, > compilation terminates with error #2. (The main part of this error > message seems to be this: GC invariant lost, file "gencgc.c", line > 4503). > > Is it possible to increase GENCGC-PAGE-SIZE even more? If so, is > that desirable? What exactly is GENCGC-PAGE-SIZE? > > Ben Lambert > > > Error #1: > > fatal error encountered in SBCL pid 18893: > 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'. > Welcome to LDB, a low-level debugger for the Lisp runtime > environment. > > Error #2: > > beginning GENESIS, creating core "output/cold-sbcl.core" > obj/from-xc/src/code/show.lisp-obj > .... > obj/from-xc/src/code/late-defbangmethod.lisp-obj > obj/from-xc/src/pcl/walk.lisp-obj > [building initial core file in "output/cold-sbcl.core": > writing 8192 bytes [2 pages] from #