Questions and Answers : Windows : Is this normal?
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myjunkmalebox

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Message 46622 - Posted: 13 Apr 2022, 16:58:59 UTC

I've got a server dedicated to BOINC, it's got several projects configured but LHC is the only one giving work at the moment. I see one job running using 8 cores (of 24). When I look in task manger my CPU usage is 0%. It's showing 10GB of ram used, but looking at the list of what's using ram the largest item is 400Mb and the 2nd largest is 62mb. All in I'd say 1gb of ram is accounted for in the list of applications. I also noticed when the job finished the used ram% plummets, even though the list of applications looks exactly the same. Most of the jobs this machine does validate successfully so I feel like the work is getting done.

Is this just an artifact of virtual box?
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Harri Liljeroos
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Message 46623 - Posted: 13 Apr 2022, 17:58:38 UTC - in response to Message 46622.  

Yes. Windows task manager is unable to show used RAM for VirtualBox tasks. But it can show the total used memory. To view the tasks used memory, you have to view it from inside the VirtualBox terminals (TOP window Alt+F3). For this you need to install VirtualBox Extension Pack (the same version as your VirtualBox). See more information from Yeti's Atlas checklist here: https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=4161#29359
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maeax

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Message 46624 - Posted: 13 Apr 2022, 18:03:05 UTC - in response to Message 46622.  

The time difference is atm very short to finish waiting Atlas-Tasks (Two or three days).
When the result is needed, the Agile Boincers are Computer from Cern-IT and
they success this tasks and your are canceled.
This is better, before they running a second or third time.
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myjunkmalebox

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Message 46628 - Posted: 13 Apr 2022, 20:00:24 UTC - in response to Message 46623.  

Thank you for the feed back. Does the visibility issue apply to processor usage as well?

Is there something that prevents BOINC from running two jobs at the same time? It's got enough cores to run two at once, but only ever runs 1.
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maeax

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Message 46631 - Posted: 14 Apr 2022, 1:18:55 UTC - in response to Message 46628.  

You have to work through Yeti's Checklist in the Atlas-Folder, if you want and
to use a app_config.xml.
In this folder are a lot of news to do it the right way.
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Harri Liljeroos
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Message 46633 - Posted: 14 Apr 2022, 8:10:23 UTC

The limiting factor usually is the amount of memory available to Boinc. An Atlas task using 8 cores needs 10200 MB of memory (3000 + ncores * 900 MB).
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computezrmle
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Message 46634 - Posted: 14 Apr 2022, 8:40:37 UTC

Harri Liljeroos wrote:
To view the tasks used memory, you have to view it from inside the VirtualBox terminals (TOP window Alt+F3).

Right. This would be the most accurate method.

Harri Liljeroos wrote:
For this you need to install VirtualBox Extension Pack ...

Not necessarily.

Before you try the method below make yourself familiar with the "host key" explained here:
https://www.virtualbox.org/manual/ch01.html#keyb_mouse_normal


Open the VirtualBox Manager, select the VM you want to look into and click on the "show" icon.
When you close the view window ensure to keep the VM running in the background.
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Crystal Pellet
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Message 46635 - Posted: 14 Apr 2022, 10:10:56 UTC - in response to Message 46634.  

When you close the view window ensure to keep the VM running in the background.
.... or use in the showed VM-console from the menu 'Machine' the option Detach GUI
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Message 46638 - Posted: 14 Apr 2022, 15:41:13 UTC - in response to Message 46633.  

The limiting factor usually is the amount of memory available to Boinc. An Atlas task using 8 cores needs 10200 MB of memory (3000 + ncores * 900 MB).


That'll do it, the server in question only has 16GB (I've got another 16 coming in the mail).

I'm not worried about seeing the actual ram usage, the behavior was just odd and was interested in an explanation.

I don't think any one addressed my follow up question, does this visibility limitation apply to CPU usage as well?
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Message 46639 - Posted: 14 Apr 2022, 16:31:46 UTC - in response to Message 46638.  

I don't think any one addressed my follow up question, does this visibility limitation apply to CPU usage as well?

When you let one Atlas-Task running with 10GByte RAM, it's ok.
Otherwhise, you have to find a way with app_config.xml, to optimize how many Atlas-Task with how many RAM and Cores.
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Message 46640 - Posted: 14 Apr 2022, 17:03:01 UTC - in response to Message 46639.  

When you let one Atlas-Task running with 10GByte RAM, it's ok.
Otherwhise, you have to find a way with app_config.xml, to optimize how many Atlas-Task with how many RAM and Cores.


This does not clearly answer my question. Does the windows task manage under report CPU usage due to the VM, similar to the RAM usage under report?
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Toby Broom
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Message 46641 - Posted: 14 Apr 2022, 17:36:32 UTC - in response to Message 46640.  

The reporting of data in windows is due to how virtualization works in windows.

For the CPU, its actually one of the VBoxHeadless.exe processes.

For the ram you can see it in a tool from Sysinternals called VMMap, its sort of hidden since the virtualbox driver allocates so its allocated to the driver not to the process like it would be normally.
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Message 46642 - Posted: 14 Apr 2022, 19:52:59 UTC - in response to Message 46641.  

Thanks for the info.
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Questions and Answers : Windows : Is this normal?


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