[Debian-science-sagemath] Bug#844789: iS: issue related to compressed manual.six

[Jerome BENOIT]

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Hello Again,

On 22/11/16 22:47, Jerome BENOIT wrote:
> Hello,
> 
> On 22/11/16 22:28, Bill Allombert wrote:
>> On Tue, Nov 22, 2016 at 05:52:11AM +0000, Jerome BENOIT wrote:
>>> I guess that the random bytes in /tmp/gapsage.log are not expected at
>>> all, and that they somehow feed some GAP variable.
>>> My current assumption is that the unpatched GAP (i.e., the upstream
>>> version) is blind to those random bytes, while the patched version
>>> (the one effectively in Debian unstable) is not, and it is getting
>>> confused. Given that the random bytes are certainly a copy
>>> of the workspace, this means that the current sage potentially deals
>>> with this large amount of random bytes for nothing but wasting its
>>> time: it could be an important hidden bug.
> 
>> You are falling short of providing evidence of this, however.
> 
>>> In short, atomic_write seems to badly interact with SaveWorkspace .
> 
> I made no claim.
> I am still confused here: why those random bytes are printed ?


It appears that atomic_write is not involved:
I was confused by the fact the test-command runs several gap sessions that log to the same file, hence the confusion.
If to each processed gap session is associated a specific log file, the issue remain but atomic_write appears not involved.

Let open an other front:
my understanding is that six files are generated, why obsolete six files are still around ?



> 
>>>
>>> SaveWorkspace is implemented in C in the source file <GAP>/src/saveload.c [1]
>>> atomic_write is part of sagemath [2]
> 
>> Why not simply remove atomic_write ? atomic_write seems to make
>> assumption on GAP I/O that are unwarranted.
> 
> Which assumption ?
> 
> Jerome


Thanks,
Jerome

> 
> 
>> Cheers,
> 
> 
> 
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> 

- -- 
Jerome BENOIT, Ph.D. | jgmbenoit-at+rezozer*dot_net
http://www.rezozer.net/

- -- 
Jerome BENOIT | calculus+at-rezozer^dot*net
https://qa.debian.org/developer.php?login=calculus@rezozer.net
AE28 AE15 710D FF1D 87E5  A762 3F92 19A6 7F36 C68B
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