Re: Using too much memory crashes entire machine
Re: Using too much memory crashes entire machine
- Subject: Re: Using too much memory crashes entire machine
- From: Tim Seufert <email@hidden>
- Date: Thu, 16 Feb 2006 18:50:12 -0800
On Feb 16, 2006, at 2:50 PM, Brian Bechtel wrote:
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.
It's not necessarily that simple. The presence of a VM system and
buffer cache in the OS which both understand 64-bit physical
addresses means there is no such thing as RAM which is only available
to a 64-bit process. Especially on Tiger, even if he never ran
anything but 32-bit processes, the system could easily use all
available physical memory.
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