[GAP Forum] bad bags

[Attila Egri-Nagy]

Dear Alexander,

Yes, actually  in our script we save workspaces at several stages. I
checked it again and it turns out that we get this message when we run
out of memory then the next command tries to save workspace. I guess
that explains that.

Thank you for your help and sorry for missing that documentation entry.

best,
attila



On Sun, Aug 29, 2010 at 4:29 PM, Alexander Konovalov
<alexk at mcs.st-andrews.ac.uk> wrote:
> Dear Attila,
>
> Are you attempting to save the workspace when this happens?
>
> The only line in the GAP kernel which may produce such message is in the
> saving workspace mechanism, and its meaning is explained in the documentation
> for SaveWorkspace (see ?SaveWorkspace in GAP):
>
> ===
> SaveWorkspace may sometimes produce warning messages, as in
>
> gap> SaveWorkspace("b5");
> #W bad bag id 4 found, 0 saved
> #W bad bag id 20 found, 0 saved
> true
>
> A small number of such messages can probably be ignored (they arise because
> the garbage collector may not always collect all dead objects, and dead objects
> may contain data that SaveWorkspace does not know how to process).
> ===
>
> Best wishes,
> Alexander
>
>
> On 25 Aug 2010, at 19:03, Attila Egri-Nagy wrote:
>
>> Hello,
>>
>> We have been running large scale computation in GAP but sometimes we get
>> warning messages like
>>
>> #W bad bag id 608 found, 0 saved
>>
>> and then execution stops. Clearly this message comes from the garbage
>> collector, but what does it mean?
>>
>> Thanks!
>>
>> attila egri-nagy
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>
>
> --
> Dr. Alexander Konovalov               School of Computer Science
> & Centre for Interdisciplinary Research in Computational Algebra
> University of St Andrews                 Tel +44/0 (1334) 461633
> http://www.cs.st-andrews.ac.uk/~alexk    Fax +44/0 (1334) 463278
> The University of St Andrews is a charity registered in Scotland:No.SC013532
>
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