Geek Answers Handbook

Is CURL slower than fread during a streaming file? how to speed up curl

I am trying to make a script to download part of a file. Just do a test with CURL and fread, I understand that CURL is slower during the threading process than fread. What for? How to speed up curl for a streaming file? I do not like to use fread, fopen, because I need a limited time in the streaming process.

Here is my sample code.

$start = microtime(true);
$f = fopen('http://news.softpedia.com/images/news2/Debian-Turns-15-2.jpeg','r');
$response = fread($f, 3); echo $response.'<br>';
$response = fread($f, 3); echo $response.'<br>';
$response = fread($f, 3); echo $response.'<br>';
$response = fread($f, 3); echo $response.'<br>';
$response = fread($f, 3); echo $response.'<br>';

$stop = round(microtime(true) - $start, 5);
echo "{$stop}s";
exit();

Fread / Fopen It only takes 1.1 s

$start = microtime(true);
$curl = curl_init('http://news.softpedia.com/images/news2/Debian-Turns-15-2.jpeg');
curl_setopt($curl, CURLOPT_BINARYTRANSFER, 1);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

curl_setopt($curl, CURLOPT_RANGE, "0-2");
$response = curl_exec($curl);echo $response.'<br>';

curl_setopt($curl, CURLOPT_RANGE, "3-5");
$response = curl_exec($curl);echo $response.'<br>';

curl_setopt($curl, CURLOPT_RANGE, "6-8");
$response = curl_exec($curl);echo $response.'<br>';

curl_setopt($curl, CURLOPT_RANGE, "9-11");
$response = curl_exec($curl);echo $response.'<br>';

curl_setopt($curl, CURLOPT_RANGE, "12-14");
$response = curl_exec($curl);echo $response.'<br>';
curl_close($curl);

$stop = round(microtime(true) - $start, 5);
echo "{$stop}s";
exit();

the curl took about 2.5 s. if I take another step to upload more of the file. curl will take longer.

Why is twisting slower? and what solution is this?

+4
source share
5 answers

, HTTP-. curl_exec HTTP-.

+3

, .

fopen/fread HTTP- .

, curl HTTP-, (. ).

, fopen/fread

$start = microtime(true);
$f = fopen('http://news.softpedia.com/images/news2/Debian-Turns-15-2.jpeg','r');
$response = fread($f, 3); echo $response.'<br>';
fclose($f)
$f = fopen('http://news.softpedia.com/images/news2/Debian-Turns-15-2.jpeg','r');
fseek($f, 3);
$response = fread($f, 3); echo $response.'<br>';
fclose($f)
$f = fopen('http://news.softpedia.com/images/news2/Debian-Turns-15-2.jpeg','r');
fseek($f, 6);
$response = fread($f, 3); echo $response.'<br>';
fclose($f)
$f = fopen('http://news.softpedia.com/images/news2/Debian-Turns-15-2.jpeg','r');
fseek($f, 9);
$response = fread($f, 3); echo $response.'<br>';
fclose($f)
$f = fopen('http://news.softpedia.com/images/news2/Debian-Turns-15-2.jpeg','r');
fseek($f, 12);
$response = fread($f, 3); echo $response.'<br>';
fclose($f)
$stop = round(microtime(true) - $start, 5);
echo "{$stop}s";
exit();

:

+2

curl_getinfo, , .

, DNS curl. IP- URL- ?

EDIT:, you can set CURLOPT_DNS_USE_GLOBAL_CACHEto true and set CURLOPT_DNS_CACHE_TIMEOUTto a longer value (for example, 1 hour) - it defaults to 2 minutes.

Src: http://php.net/manual/en/function.curl-setopt.php

+1
source

Try setting the title Keep-Alivebefore the first curl_exec, for example 300 seconds like this:

$headers = array("Keep-Alive: 300");
curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
0
source

You can try the following solution:

curl_setopt($curl, CURLOPT_RANGE, "0-2, 3-5, 6-8, 9-11, 12-14");
$response = curl_exec($curl);echo $response.'<br>';
curl_close($curl);
$stop = round(microtime(true) - $start, 5);
echo "{$stop}s";
exit();
0
source

More articles:


All Articles