Author pitrou
Recipients pitrou
Date 2008-01-14.00:48:19
SpamBayes Score 0.00685454
Marked as misclassified No
Message-id <1200271701.23.0.131498543337.issue1819@psf.upfronthosting.co.za>
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Content
This is a patch for SVN trunk which substantially speeds up function
calls with named parameters. It does so by taking into account that
parameter names should be interned, so before doing full compares we do
a first quick loop to compare pointers.

On a microbenchmark the speedup is quite distinctive:

# With patch
$ ./python -m timeit -s "def f(a,b,c,d,e): pass" "f(1,2,3,4,e=5)"
1000000 loops, best of 3: 0.515 usec per loop
$ ./python -m timeit -s "def f(a,b,c,d,e): pass" "f(a=1,b=2,c=3,d=4,e=5)"
1000000 loops, best of 3: 0.652 usec per loop

# Without patch
$ ./python-orig -m timeit -s "def f(a,b,c,d,e): pass" "f(1,2,3,4,e=5)"
1000000 loops, best of 3: 0.664 usec per loop
$ ./python-orig -m timeit -s "def f(a,b,c,d,e): pass"
"f(a=1,b=2,c=3,d=4,e=5)"
1000000 loops, best of 3: 1.07 usec per loop
History
Date User Action Args
2008-01-14 00:48:21pitrousetspambayes_score: 0.00685454 -> 0.00685454
recipients: + pitrou
2008-01-14 00:48:21pitrousetspambayes_score: 0.00685454 -> 0.00685454
messageid: <1200271701.23.0.131498543337.issue1819@psf.upfronthosting.co.za>
2008-01-14 00:48:19pitroulinkissue1819 messages
2008-01-14 00:48:19pitroucreate