PARI stack overflow

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ritterm
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Message 790 - Posted: 13 Feb 2013, 20:21:19 UTC

Seven hours of crunching time down the drain... :'(

Task 2367768 ended with a compute error. Following is included in the stderr output:

***   the PARI stack overflows !
  current stack size: 150000000 (143.051 Mbytes)
  [hint] you can increase GP stack with allocatemem()

  ***   Error in the PARI system. End of program.


Anything to worry about?

MarkR
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Message 791 - Posted: 14 Feb 2013, 3:29:45 UTC - in response to Message 790.  

Seven hours of crunching time down the drain... :'(

Task 2367768 ended with a compute error. Following is included in the stderr output:

***   the PARI stack overflows !
  current stack size: 150000000 (143.051 Mbytes)
  [hint] you can increase GP stack with allocatemem()

  ***   Error in the PARI system. End of program.


Anything to worry about?

MarkR


Sorry about that. Nothing to worry about. This is a flaw in the pari number factoring algorithm, and happens when one factor in the number field discriminant is extremely large. It's a relatively rare event, but when it happens, it requires me to run the WU separately using a different factoring algorithm (one that takes about twice as long, otherwise I would use it as the default algorithm).

I haven't seen this problem in a long time, but this latest batch of WUs has a very large bound. So I will need to start monitoring the results more closely.
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Message 793 - Posted: 15 Feb 2013, 2:52:44 UTC - in response to Message 791.  

Sorry about that. Nothing to worry about...

Thanks a lot for the feedback, Eric. I don't mind a little "wasted crunching" if things like this are relatively uncommon. Crunching on... :-)

MarkR

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