Message boards : Theory Application : "inconsist mother/daughter information in Phytia8 event"
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Erich56

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Message 44342 - Posted: 19 Feb 2021, 6:31:18 UTC

there is a Theory task running for more than a day now, and when looking up the VM console-F2 it says in every line: "inconsist mother/daughter information in Phytia8 event".
directly under each of these lines it says: "i = 19 mother = 17", or, further down: "i = 29 mother = 27" and so on.
There is no indication of events processed, as usually seen in console-F2.
Is the task broken and should I abort it?
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computezrmle
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Message 44344 - Posted: 19 Feb 2021, 8:17:41 UTC - in response to Message 44342.  

Last year Peter Skands posted a comment regarding this:
https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=5414&postid=42371
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Erich56

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Message 44345 - Posted: 19 Feb 2021, 8:52:22 UTC - in response to Message 44344.  

Last year Peter Skands posted a comment regarding this:
https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=5414&postid=42371
haha
The problem arises because we introduced a new "bremsstrahlung shower" model into Pythia 8.301, called Vincia
"bremsstrahlung shower" sounds funny :-)
And yes, the task in question is Pythia 8.301.
So I guess I let it run until it finishes.

Thanks, computezrmle, for the hint :-)
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Erich56

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Message 44358 - Posted: 21 Feb 2021, 17:22:49 UTC

I am kind of unsure by now whether this task is working the way it's supposed to.
It has been running for almost 4 days, which is unusual, but not impossible (very rarely, I've had tasks running up to 4 or even 5 days). Monitoring the Windows task manager shows me that the CPU is working for this task. Also console F3 shows a CPU utilisation of 98.6%. So the task is not dead, but could it be that it runs in some kind of never ending loop?
I am afraid I have no way to find out, have I?
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Message 44360 - Posted: 21 Feb 2021, 23:04:42 UTC

When you check its running log does it still show *number of* - events have been generated ?

(example)
Pythia::next(): 7000 events have been generated
7000 events processed
dumping histograms...
7100 events processed
7200 events processed
7300 events processed
7400 events processed
7500 events processed
7600 events processed

and continue
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Erich56

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Message 44362 - Posted: 22 Feb 2021, 5:46:35 UTC - in response to Message 44360.  

When you check its running log does it still show *number of* - events have been generated ?

(example)
Pythia::next(): 7000 events have been generated
7000 events processed
dumping histograms...
7100 events processed

no, this is exactly the problem here, as I wrote in my inital posting:
There is no indication of events processed, as usually seen in console-F2.
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Message 44371 - Posted: 22 Feb 2021, 19:33:01 UTC

If it doesn't start running *events* after 2 or 3 hours abort it.
That is always obvious if it has not done anything by then.
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Message 44372 - Posted: 22 Feb 2021, 21:01:05 UTC - in response to Message 44371.  

If it doesn't start running *events* after 2 or 3 hours abort it.
That is always obvious if it has not done anything by then.
the question though is: since it's using 1 CPU core - what is it doing if not processing events?
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Message 44373 - Posted: 23 Feb 2021, 6:21:03 UTC

the task has been running for more than 5 days.
If it doesn't finish before this evening, I will kill it. I suspect it's a waste of time and CPU power :-(
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Message 44482 - Posted: 14 Mar 2021, 6:48:11 UTC

I have received plenty of these tasks lately. How come, all of a sudden?
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Message 44483 - Posted: 14 Mar 2021, 6:54:13 UTC - in response to Message 44482.  

Atlas have also problems, see Atlas message folder.
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Message boards : Theory Application : "inconsist mother/daughter information in Phytia8 event"


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