About new WUs (since v1.35)

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Message 2446 - Posted: 3 Jun 2015, 10:15:41 UTC

Dear all,

The new bunch of WUs released a couple of days ago with the new application are quite different than the previous ones which were submitted for some months.

Within previous WUs production of top quark within the ATLAS were simulated (you can have a look at our public web page : https://atlasphysathome.web.cern.ch/content/spring-2015-top-quark ). Within recent WUs, W boson decays within the ATLAS detector are simulated (we are preparing a detailed article to be posted on our public site).

As the W boson mass is 1/2 the mass of a top quark it produces much less activity in the detector through its decay. It is faster to simulate a W boson event than a top quark. As the number of events to be simulated per WU is fixed, each WU of a W boson takes less CPU cycles. That is less credit per WU for the newly released WUs.

I hope it helps volunteers understanding some the behaviours of the new bunch of WUs.

Thank you again for your help in the ATLAS simulation effort!

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Message 2448 - Posted: 3 Jun 2015, 15:39:28 UTC - in response to Message 2446.

Okay, Lancone, thanks for this Information, it's always good to know what's going on.

The new Version brings up new questions:

    1) Is checkpointing still based on preferences "Sicherung der Aufgaben auf die Festplatte höchstens alle" ?

    2) In older Versions we could Switch between several VM-Screens with ALT/F1 - F10; this was very helpful to see if a VM had already died or not (and yes. I have already seen 1.36 VMs that died)

    3) When I set "Network activity suspended", then all Atlas-VMs immediately suspend with "Waiting for network Access". So, are the VMs still loading Content from CERN after they started ?

    4) Is there any possibility to see if a VM is still crunching fine or hangs / is crahed / whatever. vLHC Shows a growing counter so People know what the VM is really doing

    5) Do you have a new (?) preferred VirtualBox-Version ?

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Message 2450 - Posted: 3 Jun 2015, 19:23:56 UTC

Thanks for the report lancone.

Nice to get some information like that.

I am still having better luck with older versions of Oracle VB

Some tasks took a few hours to finish the last 3% but they eventually completed and were validated so I hope they did what they are supposed to.

Message boards : News : About new WUs (since v1.35)