Dead code in accept
Tom van der Woerdt
info at tvdw.eu
Mon Aug 5 07:15:19 UTC 2013
Frankly, I don't see the need. We're talking about eliminating 4 or 5 CPU instructions per accept() call which only seems relevant if that's the only thing nginx does: but with HTTP pipelining this optimization is very insignificant as that already reduces the amount of accept() calls a lot. Also, you're talking about adding extra code which might add bugs (in extensions or the main code) and that's probably not worth it.
About your benchmark: I assume you turned off keepalive and serve empty pages? Your 0.5% improvement will be more like 0.05% or less in reality.
(I'm not a nginx developer though, so this post is only intended as advice)
> On 5 aug. 2013, at 08:58, "Serguei I. Ivantsov" <manowar at gsc-game.kiev.ua> wrote:
> I think it is not a matter for trade - "dead code" - is bad programming
> technique. And it should be eliminated in a fast web server.
> Of course, general impact on overall performance is not significant, but
> on function level it will be much noticeable. I can make a perf profiling
> test to get exact counters.
>> On Mon, Aug 05, 2013 at 12:15:04AM +0300, Serguei I. Ivantsov wrote:
>>> A little test with high volume of simple requests shows 0.5% overall
>> Are you sure the numbers are significant? Doing a ministat(1)
>> analysis or similar is a good idea.
>> Maxim Dounin
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