performance of the new output api

From: Date: Wed, 02 Jun 2010 19:37:14 +0000
Subject: performance of the new output api
Groups: php.internals 
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JFYI & SCNR,

I produced some synthetic numbers of the performance comparing the
new output control layer with the old one -- actually because I
expected the new code to be less efficient than the one we had.

I didn't have the chance to do this until now, because comparing
php-unicode with php-5.x would have been even more useless ;)

Anyway, running the script listed at the end of this message gave
me quite surprising results, and still leaves me suspicious:

Running in trunk with std-output-api:
mike@waldrapp:~/tmp/php-trunk-old-output$ ./sapi/cli/php ~/tmp/ob_bench.php
Running 50000 times with a 16383 bytes long string ('   ...')

     0 -  0.000s:        0.6 /       0.6 MB
 10000 -  0.172s:      168.3 /     178.2 MB
 20000 -  0.340s:      335.9 /     355.5 MB
 30000 -  0.506s:      503.5 /     532.8 MB
 40000 -  0.671s:      671.2 /     710.2 MB
 50000 -  0.836s:      838.8 /     887.5 MB


Cleaning up 25001 output handlers
Done, total time:  1.362s, peak mem: 838.8 / 887.5 MB


Running in current trunk with new-output-api:
mike@waldrapp:~/build/php-trunk-debug$ ./sapi/cli/php ~/tmp/ob_bench.php
Running 50000 times with a 16383 bytes long string ('   ...')

     0 -  0.000s:        0.6 /       0.6 MB
 10000 -  0.104s:       69.0 /      71.7 MB
 20000 -  0.204s:      137.4 /     142.7 MB
 30000 -  0.304s:      205.8 /     213.7 MB
 40000 -  0.405s:      274.2 /     284.7 MB
 50000 -  0.506s:      342.5 /     355.7 MB


Cleaning up 25001 output handlers
Done, total time:  0.740s, peak mem: 342.6 / 355.7 MB


Now the script:
<?php
ini_set("memory_limit", "2G");

function mib($b) {

    return $b ? number_format($b/1024/1204, 1, ".", "'") : "?";

}

function mgu($r, $p = false) {

    return mib($p ? memory_get_peak_usage($r) :  memory_get_usage($r));

}

function obs($i) {

    global $start;
    fprintf(STDERR, "> %6d - %6.3fs: %10s /%10s MB\n",
        $i,
        microtime(true)-$start,
        mgu(false), mgu(true)
    );

}

$loop = @$argv[1] ?: 50000;
$data = @$argv[2] ?: str_repeat(" ", 0x3fff);

fprintf(STDERR, "Running %d times with a %d bytes long string ('%s...')\n",

    $loop,
    strlen($data),
    substr($data, 0, 3)

);

$start = microtime(true);
for ($i = 0; $i < $loop; ++$i) {

    ob_start();
    echo $data;



    if (!($i % 10000)) {
        obs($i);
    }



    if ($i % 2) {
        ob_flush();
    } elseif ($i) {
        ob_end_clean();
    }

}
obs($i);

fprintf(STDERR, "\nCleaning up %d output handlers\n",

    ob_get_level()

);
while(ob_get_level())

    ob_end_clean();


fprintf(STDERR, "Done, total time: %6.3fs, peak mem: %s / %s MB\n",

    microtime(true)-$start,
    mgu(false, true), mgu(true, true)

);



Cheers,
Mike

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