phpfastcache: performance regression with v6

Configuration:

PhpFastCache version: 6.0.1 / 5.0.16 PHP version: 7.0 Operating system: Linux / Windows

Issue description:

I’ve updated a project to phpfastcache v6 and noticed a perfomance regression. The project is running on windows using the wincache driver with php 7.0. The perfomance regression compared to 5.0.16 is between 15%-25%.

I’ve created a test case, which I’ve ran under Linux as well using the files backend. The numbers are comparable. v5.0.16: first run with empty cache: 14.666780948639 second run with full cache: 0.75569796562195

v6.0.1: first run with empty cache: 17.629030942917 second run with full cache: 1.1219041347504

The code I used writes 100.000 entries and then reads them again from the cache:

<?php

require_once('vendor/autoload.php');

use \phpFastCache\CacheManager;

$cache = CacheManager::getInstance('files');
$cycles = 100000;

function compute_str($arg) {
    $str = __FUNCTION__ . '-' . $arg . '-' . 'michael@test.example.com';
    $key = str_replace(array('{', '}', '(', ')', '/', '\\', '@', ':'), '_', $str);
    return $key;
}

function compute_md5($arg) {
    $str = __FUNCTION__ . '-' . $arg . '-' . 'michael@test.example.com';
    $key = md5($str);
    return $key;
}

function compute_sha1($arg) {
    $str = __FUNCTION__ . '-' . $arg . '-' . 'michael@test.example.com';
    $key = sha1($str);
    return $key;
}


function compute($arg) {
    return compute_sha1($arg);
}

$before = microtime(true);
for ($i=0; $i<$cycles; $i++) {
    $key = compute($i);
    $cachedNum = $cache->getItem($key);
    if (is_null($cachedNum->get())) {
        $cachedNum->set($i*$i);
        $cache->save($cachedNum);
    } else {
        $num = $cachedNum->get();
        if ($num != $i*$i) {
            print ("Something went wrong: " . $i . " -> " . $num);
        }
    }
}
$after = microtime(true);
$duration = $after - $before;
print ('first run with empty cache: ' . $duration . "\n");

$before = microtime(true);
for ($i=0; $i<$cycles; $i++) {
    $key = compute($i);
    $cachedNum = $cache->getItem($key);
    if (is_null($cachedNum->get())) {
        $cachedNum->set($i*$i);
        $cache->save($cachedNum);
    } else {
        $num = $cachedNum->get();
        if ($num != $i*$i) {
            print ("Something went wrong: " . $i . " -> " . $num);
        }
    }
}
$after = microtime(true );
$duration = $after - $before;
print ('second run with full cache: ' . $duration . "\n");

$cache->clear();