[Python-Dev] Idle speed freak looking for trouble? (original) (raw)

Fredrik Lundh fredrik@pythonware.com
Sat, 27 Oct 2001 23:21:56 +0200

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I wrote:

python 1.5: 1.02 seconds python 2.0: 1.95 seconds python 2.1: 1.85 seconds python 2.2: 1.90 seconds

doh. forgot to disable GC for 2.0 and later. with GC switched off, the difference is a bit smaller.

python 1.5: 1.02 seconds python 2.0: 1.30 seconds python 2.1: 1.20 seconds python 2.2: 1.05 seconds

now replace [None, None, None] with [item, item, item]:

python 1.5: 0.58 seconds python 2.0: 0.85 seconds python 2.1: 0.69 seconds python 2.2: 0.71 seconds

playing with other dosomething bodies (and with GC switched off), I've noticed that the following things has gotten slower from 1.5.2 to 2.2:

• concatenating strings (item+item+item is 20% slower)
• calling the float builtin using global lookup (20% slower)
• list and tuple forming using locals (10-20% slower)

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