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Created on 2011-02-01 07:57 by jneb, last changed 2022-04-11 14:57 by admin. This issue is now closed.
| Files | ||||
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| File name | Uploaded | Description | Edit | |
| speedpatch.c | jneb, 2011-02-01 07:57 | Explanation of speed patch | ||
| Messages (5) | |||
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| msg127686 - (view) | Author: Jurjen N.E. Bos (jneb) * | Date: 2011-02-01 07:57 | |
I found a very simple way to improve the speed of CPython a few percent on the most common platforms (i.e. x86), at the cost of only a few lines of code in ceval.c The only problem is that I don't have any experience in patch submission. Here are the suggested new lines (also see submitted file): #define NEXTARG() (next_instr +=2, *(unsigned short*)&next_instr[-2]) #define PEEKARG() (*(unsigned short*)&next_instr[1]) of course this code only works on little-endian processors that allow nonaligned shorts; a change to configure might be needed (*shiver*). Hope you like it. |
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| msg127794 - (view) | Author: Antoine Pitrou (pitrou) *  |
Date: 2011-02-03 14:58 | |
Ok, things are at best 3-4% faster here (often unchanged). |
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| msg185106 - (view) | Author: Mark Lawrence (BreamoreBoy) * | Date: 2013-03-24 01:06 | |
3-4% faster in some cases is better than a kick in the head but is this worth pursuing? |
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| msg185127 - (view) | Author: Mark Dickinson (mark.dickinson) * |
Date: 2013-03-24 10:38 | |
> ... is this worth pursuing? Not at the expense of introducing undefined behaviour. I suggest closing this. |
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| msg185279 - (view) | Author: Antoine Pitrou (pitrou) * |
Date: 2013-03-26 16:45 | |
> Not at the expense of introducing undefined behaviour. I suggest > closing this. ok, let's do it. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:57:12 | admin | set | github: 55296 |
| 2013-03-26 16:45:30 | pitrou | set | status: open -> closed resolution: rejected messages: + msg185279 stage: resolved |
| 2013-03-24 10:38:49 | mark.dickinson | set | nosy:
+ mark.dickinson messages: + msg185127 |
| 2013-03-24 01:06:00 | BreamoreBoy | set | nosy:
+ BreamoreBoy messages: + msg185106 |
| 2011-02-03 14:58:33 | pitrou | set | messages:
+ msg127794 versions: - Python 2.6, Python 2.5, Python 3.1, Python 2.7, Python 3.2 |
| 2011-02-02 08:12:00 | georg.brandl | set | assignee: pitrou nosy: + pitrou |
| 2011-02-01 07:57:31 | jneb | create | |