#4366: sys.path is searched ("stat"ed) for *.pyx-files insanely often
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Reporter: GeorgSWeber | Owner: somebody
Type: defect | Status: new
Priority: major | Milestone: sage-3.2
Component: coercion | Keywords:
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Hi, Emmanuel Thomé noted that
there is a speed/system call activity regression in between Sage 3.0.5 and
3.1.3.
If in Sage 3.1.3/3.1.4/3.2.alpha0 one issues something like
{{{
sage: time for i in range(10): float(1)/2
}}}
and looks at the same at the system call activity of this python
"sage.bin" process (in another terminal with something like "strace -p
'pidof sage.bin' -e trace='stat'" under Linux, or using "sudo fs_usage
4711" under Mac OS X, 4711 being the sage.bin pid gotten e.g. via the
activity tool), then one sees:
The (sage/python) sys.path is searched by the system call "stat" for
"coerce.pyx", "coerce_maps.pyx", "parent.pyx" and "integer.pyx" many
times, that whole path, and over and over again.
This does not happen under Sage 3.0.5.
Willem Jan Palenstijn proposed this code fragment, which triggers the
behaviour in Sage 3.2.alpha0, too:
{{{
sage: cm=sage.structure.element.get_coercion_model()
sage: cm.canonical_coercion(float(1),1)
}}}
and noted that
"This seems to be the _record_exception() function in the coercion model."
(See also the recent sage_devel thread started by Emmanuel Thomé about
this.)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4366>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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