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Groups > comp.lang.c > #167202
| From | Ben Bacarisse <ben.usenet@bsb.me.uk> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: How to optimize this search? |
| Date | 2022-08-24 23:38 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <87k06xqncg.fsf@bsb.me.uk> (permalink) |
| References | <d8294420-7b45-4344-b9eb-0ad867850ec6n@googlegroups.com> <87edx5u8p9.fsf@bsb.me.uk> <20220825011715.c10469adfe9f90f757b0fe8d@gmail.com> |
Anton Shepelev <anton.txt@gmail.com> writes:
> Ben Bacarisse:
>
>> I wanted to time some algorithms so in case we want some repeatable and
>> comparable timings, here is the driver program I am using:
>>
>> #include <stdio.h>
>> #include <ctype.h>
>>
>> int lookup(const char *tok, unsigned len);
>>
>> int main(void)
>> {
>> int r = 0, c;
>> while ((c = getchar()) != EOF)
>> if (isalpha(c) || c == '_') {
>> unsigned l = 0;
>> char token[20];
>> do token[l++] = c;
>> while (l < sizeof token - 1 &&
>> (isalnum(c = getchar()) || c == '_'));
>> token[l] = 0;
>> r += lookup(token, l);
>> }
>> printf("\n", r);
>> }
>>
>> The lookup function returns the token value or -1 for non-keywords.
>>
>> To get an IO and driver overhead, I compiles and linked with
>>
>> int lookup(const char *tok, unsigned l)
>> {
>> return 1;
>> }
>
> My program for performance testing accepts a set of measured
> implementations, including a reference null implementaion,
> as function pointers, runs them repeatedly with each dataset
> until total running time exceeds a certain limit (e.g. 10
> seconds), divides the result by the number of iterations,
> and subracts the null time. It has the advantage of testing
> all the algorithms against all the datasets in a single
> run and of outputting their performace in a table. It uses
> standard C fucntions to measure time. How do you measure
> time?
For the numbers I posted, the time built-in bash command. You code
looks fast, but it seems to have a bug.
What times do you get for the other search strategies?
--
Ben.
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Re: How to optimize this search? Siri Cruise <chine.bleu@yahoo.com> - 2022-08-22 09:29 -0700
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Re: How to optimize this search? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-08-22 16:53 +0100
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Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-23 15:55 -0700
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Re: How to optimize this search? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-08-22 16:55 +0100
Re: How to optimize this search? Bonita Montero <Bonita.Montero@gmail.com> - 2022-08-22 18:14 +0200
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-22 09:15 -0700
Re: How to optimize this search? Bonita Montero <Bonita.Montero@gmail.com> - 2022-08-22 18:28 +0200
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-22 09:34 -0700
Re: How to optimize this search? Bonita Montero <Bonita.Montero@gmail.com> - 2022-08-22 18:35 +0200
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-22 09:45 -0700
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Re: How to optimize this search? bart c <bart4858@gmail.com> - 2022-08-22 10:20 -0700
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Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-23 10:07 -0700
Re: How to optimize this search? bart c <bart4858@gmail.com> - 2022-08-23 11:28 -0700
Re: How to optimize this search? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-08-23 12:17 -0700
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-23 13:16 -0700
Re: How to optimize this search? bart c <bart4858@gmail.com> - 2022-08-23 13:18 -0700
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-23 13:23 -0700
Re: How to optimize this search? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-08-23 13:40 -0700
Re: How to optimize this search? bart c <bart4858@gmail.com> - 2022-08-23 16:26 -0700
Re: How to optimize this search? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-08-23 16:50 -0700
Re: How to optimize this search? bart c <bart4858@gmail.com> - 2022-08-23 17:26 -0700
Re: How to optimize this search? antispam@math.uni.wroc.pl - 2022-08-23 23:54 +0000
Re: How to optimize this search? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-08-23 17:16 -0700
Re: How to optimize this search? David Brown <david.brown@hesbynett.no> - 2022-08-24 09:43 +0200
Re: How to optimize this search? bart c <bart4858@gmail.com> - 2022-08-24 04:03 -0700
Re: How to optimize this search? antispam@math.uni.wroc.pl - 2022-08-24 14:15 +0000
Re: How to optimize this search? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-08-24 13:28 +0100
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-24 06:25 -0700
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-24 06:50 -0700
Re: How to optimize this search? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-08-24 15:19 +0100
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-24 09:46 -0700
Re: How to optimize this search? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-08-24 20:40 +0100
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-24 10:08 -0700
Re: How to optimize this search? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-08-24 20:42 +0100
Re: How to optimize this search? bart c <bart4858@gmail.com> - 2022-08-24 07:31 -0700
Re: How to optimize this search? Anton Shepelev <anton.txt@gmail.com> - 2022-08-25 01:04 +0300
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-24 16:43 -0700
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-24 16:54 -0700
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-24 17:08 -0700
Re: How to optimize this search? Anton Shepelev <anton.txt@gmail.com> - 2022-08-26 01:47 +0300
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-26 05:40 -0700
Re: How to optimize this search? Thiago Adams <thiago.adams@gmail.com> - 2022-08-26 06:29 -0700
Re: How to optimize this search? scott@slp53.sl.home (Scott Lurndal) - 2022-08-26 14:05 +0000
Re: How to optimize this search? bart c <bart4858@gmail.com> - 2022-08-24 06:45 -0700
Re: How to optimize this search? bart c <bart4858@gmail.com> - 2022-08-24 13:01 -0700
Re: How to optimize this search? Anton Shepelev <anton.txt@gmail.com> - 2022-08-25 01:17 +0300
Re: How to optimize this search? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-08-24 23:38 +0100
Re: How to optimize this search? Anton Shepelev <anton.txt@g{oogle}mail.com> - 2022-08-25 11:29 +0300
Re: How to optimize this search? Anton Shepelev <anton.txt@g{oogle}mail.com> - 2022-08-25 11:33 +0300
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