[Swarm-Support] possible memory problem on mac g5

[Paul Box]

Hello world

 I have just set up a G5 mac, and installed swarm (Thanks again Bill!).  I 
have tried running some of my favorite swarm programs, and found that I am 
getting segmentation faults when too many agents are added to the system.  The 
problem originally seemed to be memory: the program runs and eventually 
crashes with the following message:

Program received signal EXC_BAD_ACCESS, Could not access memory.
objc_msg_lookup (receiver=0x29007265, op=0xf860) at 
../../../libobjc/objc/sarray.h:232
232     ../../../libobjc/objc/sarray.h: No such file or directory.

A backtrace gives the following:

(gdb) bt
#0  objc_msg_lookup (receiver=0x29007265, op=0xf860) at 
../../../libobjc/objc/sarray.h:232
#1  0x0095691c in objc_msg_lookup (receiver=0x29007265, op=0xf860) at 
../../../libobjc/sendmsg.c:150
#2  0x0000c024 in -[Plant colonize].48 (self=0x11800a48, _cmd=0xf860) at 
Plant.m:107
#3  0x0000bf68 in -[Plant grow].47 (self=0xf860, _cmd=0xf860) at Plant.m:77
#4  0x00004978 in -[Cell step].45 (self=0x29007265, _cmd=0xf860) at Cell.m:73
#5  0x0099586c in -[Collection_any forEach:].57 (self=0xb36fec, _cmd=0xf860, 
aSelector=0xf464) at ../../../../src/collections/Collection.m:216

..... rest deleted....

The [Plant colonize] method is a plant trying to create a new plant somewhere 
in the landscape.

The machine has 2.5G of memory.   When I run the system profiler, I find that 
the swarm application is using just under 130M, so memory is apparently not 
the culprit.  I do not have this problem running the same program with the 
same parameters on linux or solaris.

Any ideas?

////////////////////////////////////////
// Paul Box
// Aquatic, Watershed, and Earth Resources
// Utah State University