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Sporadic errors in modform/ambient.py
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Jeroen Demeyer  
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 More options Oct 8 2012, 9:00 am
From: Jeroen Demeyer <jdeme...@cage.ugent.be>
Date: Mon, 08 Oct 2012 15:00:02 +0200
Local: Mon, Oct 8 2012 9:00 am
Subject: Sporadic errors in modform/ambient.py
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While testing sage-5.4, I discovered the following rare doctest error:

sage -t  --long -force_lib devel/sage/sage/modular/modform/ambient.py
you are running out of primes. 1000 coprime primes
found**********************************************************************
File
"/release/buildbot/sage/sage-1/sage_upgrade_5.2/build/sage-5.5.beta0/devel/ sage-main/sage/modular/modform/ambient.py",
line 815:
    sage: [f[0]%p for p in prime_range(100)] # long time (0s, depends on
above)
Expected:
    [0, 0, 0, 0, 1, 9, 2, 7, 0, 0, 0, 0, 1, 12, 9, 16, 37, 0, 21, 11,
70, 22, 0, 58, 76]
Got:
    [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1]
**********************************************************************
File
"/release/buildbot/sage/sage-1/sage_upgrade_5.2/build/sage-5.5.beta0/devel/ sage-main/sage/modular/modform/ambient.py",
line 817:
    sage: [f[42]%p for p in prime_range(100)] # long time (0s, depends
on above)
Expected:
    [0, 0, 4, 0, 10, 4, 4, 8, 12, 1, 23, 13, 10, 27, 20, 13, 16, 59, 53,
41, 11, 13, 12, 6, 82]
Got:
    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0]
**********************************************************************

I am going to bisect this, but it's non-trivial since the error is quite
rare.  If anybody has any clues, that would help.

Jeroen.


 
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Volker Braun  
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 More options Oct 8 2012, 9:05 am
From: Volker Braun <vbraun.n...@gmail.com>
Date: Mon, 8 Oct 2012 06:05:36 -0700 (PDT)
Local: Mon, Oct 8 2012 9:05 am
Subject: Re: Sporadic errors in modform/ambient.py
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Just to state the obvious: "you are running out of primes. 1000 coprime
primes found" doesn't sound good. Maybe thats where you are sporadically
unlucky?


 
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Jeroen Demeyer  
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 More options Oct 8 2012, 9:07 am
From: Jeroen Demeyer <jdeme...@cage.ugent.be>
Date: Mon, 08 Oct 2012 15:07:20 +0200
Local: Mon, Oct 8 2012 9:07 am
Subject: Re: [sage-devel] Sporadic errors in modform/ambient.py
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On 2012-10-08 15:00, Jeroen Demeyer wrote:

> While testing sage-5.4, I discovered the following rare doctest error:

> sage -t  --long -force_lib devel/sage/sage/modular/modform/ambient.py
> you are running out of primes. 1000 coprime primes
> found**********************************************************************

Just found out that the message "you are running out of primes" comes
from LinBox.  So perhaps the LinBox upgrade (#12883) is to blame?

 
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