#8803 closed defect (worksforme)
VM does not recognize multicore CPU
| Reported by: | Giovanni Lelli | Owned by: | |
|---|---|---|---|
| Component: | VMM | Version: | VirtualBox 4.0.6 |
| Keywords: | Multicore; CPU; linux | Cc: | |
| Guest type: | Linux | Host type: | Windows |
Description (last modified by )
The boot procedure hangs up when setting a number of CPUs higher than 1.
The host OS is Win7 SP1 Professional. The guest OS is Ubuntu 10.10.
Note: The virtual machine was created without specifying the number of CPUs (4 in my case) and does not give any problem (except for its slowness) if I use a single-CPU setting.
Attachments (4)
Change History (11)
by , 14 years ago
| Attachment: | UBUNTU 32bit-2011-04-28-12-54-26.log added |
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follow-up: 2 comment:1 by , 14 years ago
Where does the guest boot hang? Please
- Enable the 1st serial device for that VM and attach it to a host file.
- Boot the guest into GRUB and edit the kernel command line.
- Remove quiet splash
- Add ignore_loglevel console=ttyS0
Then boot the guest and attach the resulting file with the serial output to this ticket.
comment:2 by , 14 years ago
Replying to frank:
Where does the guest boot hang? Please
- Enable the 1st serial device for that VM and attach it to a host file.
- Boot the guest into GRUB and edit the kernel command line.
- Remove quiet splash
- Add ignore_loglevel console=ttyS0
Then boot the guest and attach the resulting file with the serial output to this ticket.
Hi Frank,
The VM does not even start if I set more than 1 CPU. I've uploaded a new log file, together with a screen capture.
Could you please suggest me also how to boot the guest into GRUB?
Many thanks,
Giovanni
follow-up: 4 comment:3 by , 14 years ago
Ah! The problem is that the VT-x extension of you host computer is disabled. Reboot your host, go into the BIOS and search for a setting virtualization technology or something like that -- enable that setting. Sometimes a BIOS upgrade is necessary.
comment:4 by , 14 years ago
Replying to frank:
Ah! The problem is that the VT-x extension of you host computer is disabled. Reboot your host, go into the BIOS and search for a setting virtualization technology or something like that -- enable that setting. Sometimes a BIOS upgrade is necessary.
OK, great!
Now it works! Thank you very much!
Giovanni
comment:5 by , 14 years ago
| Resolution: | → worksforme |
|---|---|
| Status: | new → closed |
comment:6 by , 12 years ago
I am having a problem running on Virtual BOx on a windows OS 7 Enterprise. The guest OS is Ubuntu 10.10.
I have created the virtual machine without specifying the number of CPUS. Before I start the virtual machine I had changed the number of CPUS to 4. (my windows box has 4 CPUS and 8 virtual cpus). I have read the thread above and check that the BIOS had the VT-x enabled. In fact the settings for the virtual machine states that VT-x/AMD-V is enabled and also that Nested Paging is enabled.
My processor is Intel Core i7-3720QM
I have tried to run a very simple mpi program using that prints the number of tasks it believes it has
mpirun -np 2 a.out
and it reports that I have only 1 CPU and of course 1 tasks.
The above line appears to run in serial.
Not sure what or if I am doing something wrong.
How do I make mpi to realize that I have 4 cores. Not sure if this is a Virtual Box issue or an mpi issue.
Can anyone help?
by , 12 years ago
comment:7 by , 12 years ago
| Description: | modified (diff) |
|---|
Your VM has definitely 4 virtual CPUs running. Just use
cat /proc/cpuinfo
in the guest to verify that. Your mpi problem is something else and I suggest you to go to the forums (forums.virtualbox.org) to ask for help.
Vbox.log