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Request #73433 could posix_fadvice be added?
Submitted: 2016-10-31 19:04 UTC Modified: 2017-03-17 22:43 UTC
From: divinity76 at gmail dot com Assigned: pollita (profile)
Status: Assigned Package: POSIX related
PHP Version: Next Minor Version OS: unix*
Private report: No CVE-ID: None
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 [2016-10-31 19:04 UTC] divinity76 at gmail dot com
Description:
------------
a php script doing file opretaions might benefit from posix_fadvice, could that be added? 

additional note: it might be worth looking into adding posix_fadvice calls to file_put_contents / file_get_contents , namely POSIX_FADV_SEQUENTIAL,  because those always are.

Test script:
---------------
<?php
$fp=fopen('bigfile','rb');
// tell the kernel that i'm probably only going to access this data once,
// so it's probably a waste to add this to the filesystem cache
posix_fadvice($fp,0,0,POSIX_FADV_NOREUSE); 

// tell the kernel that i'm probably going to read from byte 12345 to 123456789 sequentially, so optimize for that
posix_fadvice($fp,12345,123456789,POSIX_FADV_SEQUENTIAL); 
fseek($fp,12345);
$content=fread($fp,123456789-12345);
fclose($content);

// aka file_get_contents('bigfile',false,NULL,12345,123456789-12345);


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 [2017-03-17 22:43 UTC] pollita@php.net
-Status: Open +Status: Assigned -Assigned To: +Assigned To: pollita
 [2017-03-17 22:43 UTC] pollita@php.net
This sounds like a good idea.
 
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