On 2014-02-13, Tobias Weich <[email protected]> wrote:
>
>
> Am Donnerstag, 13. Februar 2014 17:49:54 UTC+1 schrieb Volker Braun:
>>
>> The following seems to run pretty much forever without running out of
>> memory:
>>
>> for k in range(100000):
>> g = G.random_element()
>> g^k
>>
>
> Ok I tried to extract the essentail part and finally found an example that
> reproduced the crash.
> The following example crashed on my local sage installation (Version 5.10)
>
> G=DihedralGroup(6)
> for k in range(10000):
> for kkk in range(6):
> c=G.character(G.character_table()[kkk])
> for g in G.list():
> for kk in range(10):
> x=c(g^kk)
>
> with the following error message:
OK, good, this looks promising; I see GAP subprocess slowly growing in
memory usage (with Sage 6.1.1).
In a minute of CPU time it has grown some 20%, for no apparent reason.
Could be a GAP memory leak, hard to say...
It would be good to try to code this directly in GAP and see if it
works.
Dima
>
> Traceback (most recent call last): x=c(g^kk)
> File "", line 1, in <module>
>
> File "/tmp/tmpMOTAUE/___code___.py", line 4, in <module>
> exec compile(u'for k in range(_sage_const_10000 ):\n for g in
> G.list():\n for kk in range(_sage_const_10 ):\n for kkk in
> range(_sage_const_6 ):\n
> c=G.character(G.character_table()[kkk])\n x=c(g**kk)
> File "", line 5, in <module>
>
> File
> "/usr/local/sage-5.8/local/lib/python2.7/site-packages/sage/groups/perm_gps/permgroup.py",
> line 2577, in character_table
> ct = [[irrG[i+1, j+1] for j in range(n)] for i in range(n)]
> File
> "/usr/local/sage-5.8/local/lib/python2.7/site-packages/sage/interfaces/gap.py",
> line 1524, in __getitem__
> return self.parent().new('%s%s'%(self._name, ''.join(['[%s]'%x for x in
> n])))
> File
> "/usr/local/sage-5.8/local/lib/python2.7/site-packages/sage/interfaces/interface.py",
> line 264, in new
> return self(code)
> File
> "/usr/local/sage-5.8/local/lib/python2.7/site-packages/sage/interfaces/interface.py",
> line 199, in __call__
> return cls(self, x, name=name)
> File
> "/usr/local/sage-5.8/local/lib/python2.7/site-packages/sage/interfaces/expect.py",
> line 1291, in __init__
> self._name = parent._create(value, name=name)
> File
> "/usr/local/sage-5.8/local/lib/python2.7/site-packages/sage/interfaces/interface.py",
> line 389, in _create
> self.set(name, value)
> File
> "/usr/local/sage-5.8/local/lib/python2.7/site-packages/sage/interfaces/gap.py",
> line 1314, in set
> out = self._eval_line(cmd, allow_use_file=True)
> File
> "/usr/local/sage-5.8/local/lib/python2.7/site-packages/sage/interfaces/gap.py",
> line 771, in _eval_line
> raise RuntimeError, message
> TypeError: Gap produced error output
> Error, exceeded the permitted memory (`-o' command line option)
>
> executing $sage65:=$sage29[3][2];;
>
>
>
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