python memory use
igouy2 at yahoo.com
Wed Sep 30 19:19:41 CEST 2009
On Sep 30, 7:38 am, Gary Robinson <gary... at me.com> wrote:
> The chart athttp://shootout.alioth.debian.org/u32q/benchmark.php?test=all〈=ja...is very interesting to me because it shows CPython using much less memory than Java for most tests.
> I'd be interested in knowing whether anybody can share info about how representative those test results are. For instance, suppose we're talking about a huge dictionary that maps integers to lists of integers (something I use in my code). Would something like that really take up much more memory in Java (using the closest equivalent Java data structures) than in CPython? I find it hard to believe that that would be the case, but I'm quite curious.
> (I could test the particular case I mention, but I'm wondering if someone has some fundamental knowledge that would lead to a basic understanding.)
1) That URL is approximate averages rather than the straight Java
2) Unless the programs are using *a lot* of memory you're just seeing
default JVM memory use.
3) More of the Java programs may have been re-written to use quad
core, which may use extra buffering.
So look for tasks that use a lot of memory and watch for time/space
2.1 Java 6 -server #2 29.32 259,868
62 Python #6 14 min 674,316
167 Python #2 38 min 221,236
2.8 Java 6 -server #2 46.87 363,488
34 Python 9 min 439,196
2.5 Java 6 -server #4 2.87 473,324
6.5 Python #3 7.67 543,908
More information about the Python-list