slowdown with massive memory usage
Hallvard B Furuseth
h.b.furuseth at usit.uio.no
Sun Aug 1 22:08:14 CEST 2004
Andrew MacIntyre wrote:
> On Sat, 30 Jul 2004, Hallvard B Furuseth wrote:
>> I have a program which starts by reading a lot of data into various
>> When I moved a function to create one such dict from near the beginning
>> of the program to a later time, that function slowed down by a factor
>> of 8-14:
> Python 2.2 didn't use PyMalloc by default. This leaves Python at the
> mercy of the platform malloc()/realloc()/free(), and Python has found
> rough spots with nearly every platform's implementation of these - which
> is why PyMalloc was written.
> While it isn't certain that this is your problem, if you can rebuild your
> Python interpreter to include PyMalloc (--with-pymalloc I think), you can
> find out.
Thanks. I'll check that when I get time. Until then, malloc gets the
blame until proven innocent, since profiling and test output turned out
nothing else that was different. (See my reply to Istvan.)
> Be warned that there were some bugs in PyMalloc that were fixed before
> Python 2.3 was released (when PyMalloc became a default option); as far as
> I recall, these bugfixes were never backported to 2.2x. So I wouldn't
> recommend running a 2.2.3 PyMalloc enabled interpreter in production
> without seriously testing all your production code.
If PyMalloc helps, I'll push for an upgrade to 2.3. Thanks again.
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