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<tt>Dear Gareth,<br>
<br>
the issue you are reporting seems quite strange. There should be no
hard limit apart from computational resources. On the other hand, I
could only just start 45 virtual machines (with a "factory
configuration") on a Core 2 Quad with 4GB of RAM without any problems.<br>
<br>
Here is a first checklist of things that come into my mind:<br>
- disable exec-shield (</tt><code>sysctl -w kernel.exec-shield=0);</code><br>
<tt>- check for messages from the host kernel; some actions (e.g.
out-of-memory killing) are undertaken without the user being notified;<br>
- check how many running processes/threads you have (unlikely to
happen, but you might be running out of PIDs);<br>
- check that you can launch multiple (by "multiple" I mean "really
many") instances of the terminal emulator you are using; a crashing
terminal emulator could be another cause for apparently inexplicable
virtual machine aborts.<br>
<br>
Regards,<br>
Massimo.<br>
<br>
<br>
<br>
<br>
</tt><br>
On 03/16/2011 09:16 PM, Gareth Lapworth wrote:
<blockquote
cite="mid:AANLkTin2ZFNOHEZyn+c-OZGOq=d+NgWC4xg7EfZmeB5L@mail.gmail.com"
type="cite">
<pre wrap="">Dear All,
I have just joined the list, so I do apologise if this has been asked
before - I have also searched the website, and looked through the
mailing list archives but I didn't seem to find an answer to my
problem.
I am in the process of building a netkit lab. I have 37 of my
machines currently running but it seems that I have hit a wall and I
am unable to launch any more. When I attempt to launch a further
machine, an xterm executes and quickly dies. I ran the command
vstart vm --verbose --con0=this to see if I could catch the error
message before it disappeared, The following data was displayed:
============= Starting virtual machine "vm" =============
Kernel: /opt/netkit/kernel/netkit-kernel
Modules: /opt/netkit/kernel/modules
Memory: 32 MB
Model fs: /opt/netkit/fs/netkit-fs
Filesystem: /home/glapworth/labs/ctec3427_cw2/nw-c/vm.disk (new)
Hostfs at: /home/glapworth
Running ==> /opt/netkit/kernel/netkit-kernel
modules=/opt/netkit/kernel/modules name=vm title=vm umid=vm mem=36M
ubd0=/home/glapworth/labs/ctec3427_cw2/nw-c/vm.disk,/opt/netkit/fs/netkit-fs
root=98:1 uml_dir=/home/glapworth/.netkit/mconsole
hosthome=/home/glapworth con0=fd:0,fd:1 con1=null SELINUX_INIT=0
Locating the bottom of the address space ... 0x10000
Locating the top of the address space ... 0xc0000000
Core dump limits :
soft - 0
hard - NONE
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK
Checking for tmpfs mount on /dev/shm...OK
Checking PROT_EXEC mmap in /dev/shm/...OK
Checking for the skas3 patch in the host:
- /proc/mm...not found: No such file or directory
- PTRACE_FAULTINFO...not found
- PTRACE_LDT...not found
UML running in SKAS0 mode
Adding 2617344 bytes to physical memory to account for exec-shield gap
Terminated
I can't see anything in this output that corresponds to a problem
other than the word "Terminated". The machine I am running on is a
quad core Xeon with 6Gb RAM running Ubuntu 10.04. My system shows
that I have only used 647Mb RAM at the moment and therefore I should
have adequate to continue. My CPU is happily running at 5% usage on
average so this shouldn't be too taxing on the hardware.
I've checked my file limits and I am not getting any too many open
files errors. Any ideas or help would be greatly appreciated.
Thanks in advance.
All the best,
Gareth
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</pre>
</blockquote>
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