How much ram do you have? How much swap? Are you on a 32-bit ore 64-bit
machine? Basically, to simulate a machine with 2G of memory, you need to
have more than 2G of virtual memory. If you're on a 32-bit machine, that
seriously limits what you can get at.
Nate
I am getting a simliar error as this person below but I am not
starting from a check point but rather just starting at the beginning
of the simulation. I get the following error. The input is also show
below. I am not sure of the memory size of the machine I am running
it on. Could this could be what's preventing the running of the
program. What else could be the issue that is causing this MMAP to
return a fatal error?
Thanks,
Aaron
[EMAIL PROTECTED] m5-2.0b3]$ ./build/ALPHA_SE/m5.opt
./configs/example/se.py -c
tests/test-progs/hello/bin/alpha/linux/hello
M5 Simulator System
Copyright (c) 2001-2006
The Regents of The University of Michigan
All Rights Reserved
M5 compiled Oct 27 2007 16:52:57
M5 started Thu Nov 1 13:41:56 2007
M5 executing on localhost.localdomain
command line: ./build/ALPHA_SE/m5.opt ./configs/example/se.py -c
tests/test-progs/hello/bin/alpha/linux/hello
Global frequency set at 1000000000000 ticks per second
mmap: Cannot allocate memory
fatal: Could not mmap!
@ cycle 0
[PhysicalMemory:build/ALPHA_SE/mem/physical.cc, line 66]
Memory Usage: 15060 KBytes
The problem is the amount of virtual address space available to M5.
On a 32bit system that is only about 3GB. Since the simulated memory
is mapped as a contiguous block you need 2GB of contiguous free
address space.
When starting from a checkpoint the memory in the config file is
mmaped, and then when the checkpoint in unserialized, that memory is
unmmaped, the gziped memory image is uncompressed and loaded. The
problem is probably that the munmap() is before the gzdopen() so
gzdopen is probably getting a small chunk of the 2GB space which
means that you can't mmap it again. Moving the munmap() to after the
gzdopen() will probably fix the problem for you.
The other two solutions for being able to have a bigger amount of
memory are:
1. Use a 64bit system.
2. Change physical memory to allocate pages instead of the entire
memory at once and read/write them to disk as they are needed (kind
of like implementing VM in M5 for the guest OS).
Ali
On Jul 26, 2006, at 11:32 PM, Adam Kaplan wrote:
I noted that on my system I am able to start the full-system
simulator and
boot Linux successfully with 2047MB of simulated DRAM (not with 2048
though...Linux will not load), and yet when I checkpoint and try to
start
simulation from checkpoint (also with 2047MB of DRAM), I get the
following:
fatal: Could not mmap physical memory!
@ cycle 607401203386
[unserialize:m5/mem/functional/physical.cc, line 335]
Anyone know a way around this? (It seems that the problem lies in
the amount of mem-alloc attempted on my system. Is the allocation
requirement different if starting from a checkpoint?)
Thanks for any help/suggestions you can provide!
-Adam
----------------------------------------------------------------------
---
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to
share your
opinions on IT & business topics through brief surveys -- and earn
cash
http://www.techsay.com/default.php?
page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
m5sim-users mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/m5sim-users
-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys -- and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
m5sim-users mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/m5sim-users
_______________________________________________
m5-users mailing list
m5-users@m5sim.org
http://m5sim.org/cgi-bin/mailman/listinfo/m5-users
_______________________________________________
m5-users mailing list
m5-users@m5sim.org
http://m5sim.org/cgi-bin/mailman/listinfo/m5-users
