On 2/15/06, Tor Andre Myrvoll <email@hidden> wrote:
> The problem is that if I let the program use 6-7 GB out of my total
> of 8 GB, the machine will eventually crash (see an example of a crash-
> dump below. The cpu causing the panic varies from time to time). Note
> that the machine is not swapping when these crashes occur.
>
> Now, I would be willing to blame this on bad memory, but the machine
> runs weeks on end performing other heavy computational tasks
> (although in 32-bit mode). The same problem also occurs on a separate
> dual G5 with 8 GB of memory.
> panic(cpu 2 caller 0x000A8D80): Uncorrectable machine check: pc =
> FFFFFFFFFFFF8260, msr = 900000000004F030, dsisr = 00200000, dar =
> 00000000B0011C00
Your RAM is incompatible with your machine, or you have a bad RAM
DIMM. Run the Apple Hardware Test which came with the machine. In
32-bit mode, your application can only access 4GB of RAM. In 64-bit
mode, it's accessing previously unused RAM; accessing that RAM is
causing the machine check panic.
RAM specifications for the PowerMac G5 machines can be found at
<http://docs.info.apple.com/article.html?artnum=86414> and
<http://developer.apple.com/documentation/Hardware/Developer_Notes/Macintosh_CPUs-G5/PowerMacG5/4Expansion/chapter_5_section_2.html>
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