#15950: Consider using a faster malloc()
---------------------------+---------------------------------
Reporter: mmezzarobba | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-wishlist
Component: performance | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
---------------------------+---------------------------------
Some unscientific experiments suggesting that sage may benefit from using
a custom malloc(), at lest on Linux/glibc:
{{{
$ sage
┌────────────────────────────────────────────────────────────────────┐
│ Sage Version 6.2.beta4, Release Date: 2014-03-11 │
│ Type "notebook()" for the browser-based notebook interface. │
│ Type "help()" for help. │
└────────────────────────────────────────────────────────────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Warning: this is a prerelease version, and it may be unstable. ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
sage: P.<a,b,c> = PolynomialRing(QQ)
sage: %timeit d=(a+b+c+1)^100
1 loops, best of 3: 5.42 s per loop
sage: m = random_matrix(QQ, 1000)
sage: %timeit m**2
1 loops, best of 3: 957 ms per loop
}}}
{{{
$ LD_PRELOAD="libjemalloc.so.1" sage
┌────────────────────────────────────────────────────────────────────┐
│ Sage Version 6.2.beta4, Release Date: 2014-03-11 │
│ Type "notebook()" for the browser-based notebook interface. │
│ Type "help()" for help. │
└────────────────────────────────────────────────────────────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Warning: this is a prerelease version, and it may be unstable. ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
sage: P.<a,b,c> = PolynomialRing(QQ)
sage: %timeit d=(a+b+c+1)^100
1 loops, best of 3: 3.98 s per loop
sage: m = random_matrix(QQ, 1000)
sage: %timeit m**2
1 loops, best of 3: 1.07 s per loop
}}}
{{{
$ LD_PRELOAD="/usr/lib/libtcmalloc.so.4" sage
┌────────────────────────────────────────────────────────────────────┐
│ Sage Version 6.2.beta4, Release Date: 2014-03-11 │
│ Type "notebook()" for the browser-based notebook interface. │
│ Type "help()" for help. │
└────────────────────────────────────────────────────────────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Warning: this is a prerelease version, and it may be unstable. ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
sage: P.<a,b,c> = PolynomialRing(QQ)
sage: %timeit d=(a+b+c+1)^100
1 loops, best of 3: 3.85 s per loop
sage: m = random_matrix(QQ, 1000)
sage: %timeit m**2
1 loops, best of 3: 840 ms per loop
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/15950>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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