Author: Robert Hyatt
Date: 11:13:08 08/27/05
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On August 27, 2005 at 11:43:15, Roy Brunjes wrote: >I downloaded and compiled Crafty 20.0 on my Fedora Core 4 Pentium 4 system (used >the default Makefile and just typed "make". > >When I run crafty and my .craftyrc file has the following in it: > >hash 256M >hashp 24M >cache 32M >show book >resign 6 >log on ># tbpath=/home/roy/chess/TBs ># egtb > >When I run crafty I see this: > >[roy@localhost .crafty]$ ./crafty >found computer opening book file [./bookc.bin]. >Segmentation fault > >If I delete the .craftyrc file, it works fine. So, I started commenting out >lines in .craftyrc to see which line might be the problem. It turns out that the >first line (hash 256M) is the culprit. My system has 2 GB of RAM on it and there >is roughly 1.7GB free at the moment ... > >Any ideas on what might be causing this? I would like to run crafty with more >RAM used for hashtables than whatever the defaults might be. > >Thanks, > >Roy Yes. This is my fault. For linux, I use shmget() to allocate dynamic memory, so that I can share the stuff on a multiple-cpu machine. Unfortunately, linux has a very small shmmax (max shared memory segment size) by default. As root, do this: echo "1000000000" > /proc/sys/kernel/shmmax and you will be set. I had a test for shmget() failing, and it would produce a message telling you to do the above. But somewhere along the way that message got lost. I'll fix 20.0 and re-do the source files to avoid failing without any warning...
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