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Re: [RFC] temporary Lisp_Strings
From: |
Dmitry Antipov |
Subject: |
Re: [RFC] temporary Lisp_Strings |
Date: |
Tue, 02 Sep 2014 19:13:15 +0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 |
On 09/02/2014 06:00 PM, Stefan Monnier wrote:
Have you made some preliminary measurements (on microbenchmarks) to try
and see how much speed up we might gain? Given the cost of strlen and
parse_str_as_multibyte, I'd expect that the best-case benefit might turn
out to be rather small.
For the moment, I don't have an idea how to benchmark parse_str_as_multibyte
in "near-to-real-use" conditions. But I guess that we can have some gain
for "simple" (short, especially short unibyte) strings. That guess is based
on the following results (note ~3x speedup in strcpy/strcat workload):
$ gcc -Wall -O2 -o t-alloca t-alloca.c t-use.c
$
$ /usr/bin/time ./t-alloca 100 100
Use malloc for allocation and sprintf for workload
2.23user 0.00system 0:02.23elapsed 100%CPU (0avgtext+0avgdata 1440maxresident)k
0inputs+0outputs (0major+59minor)pagefaults 0swaps
$
$ /usr/bin/time ./t-alloca 100 100 x
Use alloca for allocation and sprintf for workload
1.85user 0.00system 0:01.85elapsed 99%CPU (0avgtext+0avgdata 1436maxresident)k
0inputs+0outputs (0major+59minor)pagefaults 0swaps
$
$ gcc -DFAST -Wall -O2 -o t-alloca t-alloca.c t-use.c
$
$ /usr/bin/time ./t-alloca 100 100
Use malloc for allocation and strcpy/strcat for workload
0.56user 0.00system 0:00.56elapsed 99%CPU (0avgtext+0avgdata 1440maxresident)k
0inputs+0outputs (0major+59minor)pagefaults 0swaps
$
$ /usr/bin/time ./t-alloca 100 100 x
Use alloca for allocation and strcpy/strcat for workload
0.20user 0.00system 0:00.20elapsed 100%CPU (0avgtext+0avgdata 1440maxresident)k
0inputs+0outputs (0major+60minor)pagefaults 0swaps
Dmitry
t-alloca.c
Description: Text Data
t-use.c
Description: Text Data
- [RFC] temporary Lisp_Strings, Dmitry Antipov, 2014/09/02
- Re: [RFC] temporary Lisp_Strings, Andreas Schwab, 2014/09/02
- Re: [RFC] temporary Lisp_Strings, Stefan Monnier, 2014/09/02
- Re: [RFC] temporary Lisp_Strings,
Dmitry Antipov <=
- Re: [RFC] temporary Lisp_Strings, Stefan Monnier, 2014/09/02
- Benchmarking temporary Lisp objects [Was: Re: [RFC] temporary Lisp_Strings], Dmitry Antipov, 2014/09/03
- Re: Benchmarking temporary Lisp objects [Was: Re: [RFC] temporary Lisp_Strings], Stefan Monnier, 2014/09/03
- Re: Benchmarking temporary Lisp objects [Was: Re: [RFC] temporary Lisp_Strings], Paul Eggert, 2014/09/03
- Re: Benchmarking temporary Lisp objects [Was: Re: [RFC] temporary Lisp_Strings], Dmitry Antipov, 2014/09/03
- Re: Benchmarking temporary Lisp objects [Was: Re: [RFC] temporary Lisp_Strings], Paul Eggert, 2014/09/03
- Re: Benchmarking temporary Lisp objects [Was: Re: [RFC] temporary Lisp_Strings], Stefan Monnier, 2014/09/03
- Re: Benchmarking temporary Lisp objects [Was: Re: [RFC] temporary Lisp_Strings], Paul Eggert, 2014/09/03
- Re: Benchmarking temporary Lisp objects [Was: Re: [RFC] temporary Lisp_Strings], Dmitry Antipov, 2014/09/04
- Re: Benchmarking temporary Lisp objects [Was: Re: [RFC] temporary Lisp_Strings], Paul Eggert, 2014/09/04