Storing state information (was Re: Ah, those uninitiated people...)
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- Subject: Storing state information (was Re: Ah, those uninitiated people...)
- From: Mark Hamburg <mark@...>
- Date: 2010年1月14日 17:49:06 -0800
On Jan 14, 2010, at 7:15 AM, Mark Hamburg wrote:
> While upvalues are slower than locals, I suspect that a table lookup is slower still.
Some statistics. This basically is the result of timing a loop that counts up to a really big number using various ways of storing the counter.
Lua 5.1.4:
Local 98.276374
Upvalue (open) 209.396356
Upvalue (closed) 216.251567
Table field 561.369677
Global 612.179566
So, locals are a clear win. I'm interested that tables are a win relative to globals. Presumably this has to do with the table being smaller. Or else there's a lot of overhead in the opcodes to get and set globals.
LuaJIT levels the playing field.
LuaJIT 2.0:
Local 11.21
Upvalue (open) 11.31
Upvalue (closed) 11.18
Table field 11.15
Global 11.36
Lua 5.2 (work1) is also definitely a bit slower:
Lua 5.2 (work1):
Local 107.266672
Upvalue (open) 223.447284
Upvalue (closed) 222.159344
Table field 620.652007
Global 677.802486
Mark
- References:
- Re: Ah, those uninitiated people..., Tony Finch
- Re: Ah, those uninitiated people..., Wesley Smith
- Re: Ah, those uninitiated people..., David Kastrup
- Re: Ah, those uninitiated people..., Tony Finch
- Re: Ah, those uninitiated people..., David Kastrup
- Re: Ah, those uninitiated people..., Tony Finch
- Re: Ah, those uninitiated people..., David Kastrup
- Re: Ah, those uninitiated people..., Tony Finch
- Re: Ah, those uninitiated people..., David Given
- Re: Ah, those uninitiated people..., Wesley Smith
- Re: Ah, those uninitiated people..., Sean Conner
- Re: Ah, those uninitiated people..., Mark Hamburg