The PARI stack overflows !

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Richard Haselgrove

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Message 683 - Posted: 8 Jul 2012, 14:49:40 UTC

Eric,

You might like to have a look at workunit 1022542. 7 people have attempted it so far, all ending with the same error. I've got copy number eight - any parameter I can tweak to give it the extra stack space it's asking for?

N2 = 25.
*** 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
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Profile Eric Driver
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Message 684 - Posted: 8 Jul 2012, 21:00:55 UTC - in response to Message 683.  

Thanks for reporting. Your best bet at this time is to abort that wu (I also just cancelled it so it wont be re-sent).

I noticed this problem about a week ago. It seems to happen with about 1 out of every 1000 wus. As it turns out, increasing the stack size doesn't help. I've tracked the problem down to the factoring algorithm. If I use a more robust algorithm it fixes the problem but the wus take about 2 to 3 times longer to complete. Right now I'd rather put up with a few bad wus than take the hit in processing time.

So my strategy in the short term is to try and find these bad wus early and cancel them before they bounce around between too many hosts. In the meantime, I am trying to find a better work around. And once I understand the problem better I will report it to the folks at pari.
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Richard Haselgrove

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Message 685 - Posted: 8 Jul 2012, 22:45:25 UTC - in response to Message 684.  

Thanks for reporting. Your best bet at this time is to abort that wu (I also just cancelled it so it wont be re-sent).

Done. I'll let you know if I see any others with high replication numbers.
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Message 721 - Posted: 2 Oct 2012, 11:49:43 UTC

I'm not sure if you're looking to have these reported, but I just got the same error with WU 1321700. I was victim #6 and it's been sent to a 9th host.
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Profile Eric Driver
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Message 722 - Posted: 2 Oct 2012, 15:01:43 UTC - in response to Message 721.  

I'm not sure if you're looking to have these reported, but I just got the same error with WU 1321700. I was victim #6 and it's been sent to a 9th host.


Yes, thanks for reporting this. It's been a while since I've seen one of these errors.
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