Re: [Swarm-Support] possible memory problem on mac g5

[Bill Northcott]

Hi Paul

Have you tried the code on a G4 Mac?

Which compiler are you using?

The crash is happening within the Objective-C runtime and as far as I 
know this has not been used on a G5 before.  You are close to the 
bleeding edge on this.

Bill
On 06/04/2004, at 2:24 AM, Paul Box wrote:

> 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
>
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