#5478: [with patch, needs review] RestrictedPartitions is very slow and a huge
memory hog
---------------------------+------------------------------------------------
Reporter: ddrake | Owner: ddrake
Type: defect | Status: new
Priority: major | Milestone: sage-combinat
Component: combinatorics | Keywords: combinat, partitions, gap
---------------------------+------------------------------------------------
Comment(by ddrake):
Some benchmarks (all on sage.math):
{{{
BEFORE
sage: get_memory_usage()
695.7421875
sage: ps = RestrictedPartitions(100, ([1,6..100] + [4,9..100]))
sage: %time sum(1 for p in ps)
CPU times: user 26.89 s, sys: 1.11 s, total: 28.00 s
Wall time: 28.69 s
74040
sage: get_memory_usage()
1781.41796875
}}}
{{{
AFTER
sage: get_memory_usage()
699.828125
sage: ps = Partitions(100, parts_in=([1,6..100] + [4,9..100]))
sage: %time sum(1 for p in ps)
CPU times: user 4.96 s, sys: 0.02 s, total: 4.98 s
Wall time: 4.98 s
74040
sage: get_memory_usage()
699.828125
}}}
The above example which prompted this ticket:
{{{
BEFORE
sage: get_memory_usage()
695.73828125
sage: ps = RestrictedPartitions(3000, [10,50,100,500,1000])
sage: %time sum(1 for p in ps)
CPU times: user 5.69 s, sys: 0.21 s, total: 5.90 s
Wall time: 6.05 s
3506
sage: get_memory_usage()
935.48046875
}}}
{{{
AFTER
sage: get_memory_usage()
699.82421875
sage: ps = Partitions(3000, parts_in=[10,50,100,500,1000])
sage: %time sum(1 for p in ps)
CPU times: user 1.08 s, sys: 0.00 s, total: 1.08 s
Wall time: 1.09 s
3506
sage: get_memory_usage()
699.82421875
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5478#comment:5>
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