note 105541 added to function.strncmp
| From: | dharknessatgmaildotcom at osu1 dot php dot net | Date: | Thu, 25 Aug 2011 20:23:37 +0000 |
| Subject: | note 105541 added to function.strncmp | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-182737@lists.php.net to get a copy of this message | ||
@bobvin - When I run your script as written I get the results you summarized. Stranger, strpos()
with "xyz" is faster than with "abc". This is backwards from my expectation
since "xyz" will require scanning the whole string. I see the same thing for
"123": it's faster than both. Perhaps strpos() is scanning from the end of the
string?
However, if I reverse the loops so that strpos() is timed after strncmp() , strncmp() is faster than
"abc" for strpos() and nearly identical to it for "xyz" and "123".
Also, "abc" with strpos() is 30% slower than "xyz" and "123".
In short, performing micro-benchmarks is always tricky and rarely repeatable. I see significant
variations when running this script multiple times.
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Server IP: 69.147.83.197
Probable Submitter: 75.147.140.118
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Manual Page -- http://www.php.net/manual/en/function.strncmp.php
Edit -- https://master.php.net/note/edit/105541
Del: integrated -- https://master.php.net/note/delete/105541/integrated
Del: useless -- https://master.php.net/note/delete/105541/useless
Del: bad code -- https://master.php.net/note/delete/105541/bad+code
Del: spam -- https://master.php.net/note/delete/105541/spam
Del: non-english -- https://master.php.net/note/delete/105541/non-english
Del: in docs -- https://master.php.net/note/delete/105541/in+docs
Del: other reasons-- https://master.php.net/note/delete/105541
Reject -- https://master.php.net/note/reject/105541
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