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Re: Why does adding a useless copy-sequence and discarding the result ma
From: |
Clément Pit-Claudel |
Subject: |
Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster? |
Date: |
Sat, 25 Mar 2017 09:54:15 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
On 2017-03-25 06:47, Andreas Politz wrote:
> Clément Pit-Claudel <address@hidden> writes:
>
>> On 2017-03-25 00:06, Clément Pit-Claudel wrote:
>>> * Why does running additional, supposedly useless code speed things up so
>>> much? (1)
>>
>> Interestingly, it turns out that (copy-sequence) isn't needed:
>> instead, it's enough to use (sleep-for 0.000001) (or even (sleep-for
>> cl-least-positive-normalized-float)) to get the 40x speedup.
>
> What about this explanation: If you make Emacs wait inside the loop, it
> can send some of the strings immediately. Otherwise, it'll have to
> store them all/some in memory first.
Possibly! But does this theory explain the following ((3) in my original email)?
(benchmark-send-string t 200 65536 "read") →
(0.18765710700000002 46 0.14072835099999995)
(benchmark-send-string nil 200 65536 "read") → (3.397287521
0 0.0)
(benchmark-send-string t 1600 8192 "read") → (0.258897164 49
0.17045154200000004)
(benchmark-send-string nil 1600 8192 "read") → (0.07095391 0 0.0)
Sending 1600 strings of length 8192 with or without sleeps is much faster than
sending 200 strings of length 65536.
Thanks for your ideas!
Clément.
- Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?, (continued)
- Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?, Andreas Politz, 2017/03/25
- Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?, Clément Pit-Claudel, 2017/03/25
- Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?, Andreas Politz, 2017/03/25
- Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?, Clément Pit-Claudel, 2017/03/25
- Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?, Eli Zaretskii, 2017/03/25
- Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?, Andreas Politz, 2017/03/25
- Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?, Eli Zaretskii, 2017/03/25
- Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?, Andreas Politz, 2017/03/25
- Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?, Clément Pit-Claudel, 2017/03/25
Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?, Andreas Politz, 2017/03/25
- Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?,
Clément Pit-Claudel <=
Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?, Stephen Leake, 2017/03/26