#6391: libGAP! -- create a Cython library interface to gap
----------------------------------------------------------------------------+
Reporter: was |
Owner: was
Type: enhancement |
Status: positive_review
Priority: major |
Milestone: sage-5.5
Component: group theory |
Resolution:
Keywords: |
Work issues:
Report Upstream: N/A |
Reviewers: Dima Pasechnik, Ivan Andrus, Volker Braun, William Stein
Authors: Dima Pasechnik, Ivan Andrus, Volker Braun, William Stein |
Merged in:
Dependencies: #13415, #13123, #13211 |
Stopgaps:
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Comment (by mmarco):
Another question: i can use much less memory in a gap computation through
libgap that i can in a standard sage/gap session:
{{{
./sage -gap
********* GAP, Version 4.5.6 of 16-Sep-2012 (free software, GPL)
* GAP * http://www.gap-system.org
********* Architecture: x86_64-unknown-linux-gnu-gcc-default64
Libs used: gmp, readline
Loading the library and packages ...
Packages: GAPDoc 1.5.1
Try '?help' for help. See also '?copyright' and '?authors'
gap> F:=FreeGroup(2);
<free group on the generators [ f1, f2 ]>
gap> H:=F/[F.1^2,F.2^3];
<fp group on the generators [ f1, f2 ]>
gap> a:=GeneratorsOfGroup(H)[1];
f1
gap> a;
f1
gap> Order(a);
2
gap> quit;
}}}
But:
{{{
sage: G=libgap.FreeGroup(2)
sage: (a,b)=G.GeneratorsOfGroup()
sage: H=G/libgap([a^2,b^3])
sage: (c,d)=H.GeneratorsOfGroup()
sage: c.Order()
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
/home/mmarco/sage-5.4/<ipython console> in <module>()
/home/mmarco/sage-5.4/local/lib/python2.7/site-
packages/sage/libs/gap/element.so in
sage.libs.gap.element.GapElement_MethodProxy.__call__
(sage/libs/gap/element.c:8414)()
/home/mmarco/sage-5.4/local/lib/python2.7/site-
packages/sage/libs/gap/element.so in
sage.libs.gap.element.GapElement_Function.__call__
(sage/libs/gap/element.c:7947)()
ValueError: libGAP: Error, exceeded the permitted memory (`-o' command
line option)
}}}
It is the same computation, but in the gap session it has enough memory
(it doesn't need much: even with -o 256M the computation succeeds), and
through libgap it runs out of memory.
I don't know if it is relevant, but i have no swap enabled in my system.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6391#comment:140>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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