Disable or remove apc

Question

I installed APC on my ubuntu 11.04 linux and I want to make some performance benchmarks to see what's the speed improvement over PHP without APC but I don't know how to disable/remove the APC.

I tried to empty my apc.ini files but it didn't worked. Still after I load a page for the first time, the page will be stored in the cached and the second time I load the page, it loads much faster.

Here's a PHP file that I use to measure the time.

<?php 
    function getTime() 
        { 
        $a = explode (' ',microtime()); 
        return(double) $a[0] + $a[1]; 
        } 
    $Start = getTime(); 
    ?>
    <?php require_once("includes/connection.php");?>
    <?php require_once("includes/functions.php");?>
    <?php
        find_selected_page(true);   
    ?>
    <?php require_once("includes/header.php");?>

        <table id="structure">
            <tr>
                <td id="navigation">
                    <?php echo navigation_public($sel_subject,true);
                      //            $sel_page is sent as a GLOBAL   so that we can reuse is in the page area
                    ?>
                </td>
                <td id="page">
                    <?php

                        if($sel_page!=NULL)
                        {
                            echo "<h2>".htmlentities($sel_page['menu_name'])."</h2>";
                            echo "<p>".strip_tags(nl2br($sel_page['content']),"<b><br><p><a>")."</p>";
                        }
                        else if($sel_subject!=NULL) 
                        {
                            echo "<h2>".$sel_subject['menu_name']."</h2>";
                        }
                        else 
                        {
                            echo "<h2>Welcome to Widget Corp</h2>";
                        }
                    ?>
                </td>   
            </tr>   
        </table>    
        <?php 
    $End = getTime(); 
    echo "Time taken = ".number_format(($End - $Start),3)." secs"; 
    ?>
    <?php require("includes/footer.php");?>

Caesura

Removing the apc.ini file should be enough, have you restarted Apache after you cleared that file? – Institutive

I removed it's content. Not the file itself. And yes I restarted my apache using the sudo /etc/init.d/apache2 restart . – Caesura

Answer 1

Change :

extension=apc.so

By :

;extension=apc.so

In :

/etc/php5/apache2/conf.d/apc.ini

And restart Apache server :

apache2ctl graceful

Engrail

Sorry but it seems that the speed of my pages still improves. When I load apc.php in the browser it tells me "No cache info available. APC does not appear to be running." but when I load a page for the first time it takes 0.059 seconds and the second and third time and so on it takes about 0.010 seconds. – Caesura

Your methodology for measuring the performance of pages is wrong. You are measuring the time PHP takes to run the script - but opcode caches speed up the time taken to parse the script - the resulting data structure is the same and processed in the same way. If you want to measure the performance difference, then look at %D in apache log - or use firebug etc. – Elias

@DragosC. you must have another cache activated that's making this performance impovement. (most likely the cache by default in whatever system you are writing your web application). – Astrionics

Answer 2

You can enter the following command with root permission:

pecl uninstall apc

Regolith

Answer 3

apc.enabled can be set to 0 to disable APC from php.ini Than restart your web server or php-fpm.

Marismarisa

Answer 4

you can use following script then put it on 1st line of your php file,

apc_clear_cache();

Bissau

Answer 5

If you are running apache:

1. edit or create an .htaccess file in the root of your project

2. add this line to the file

   php_flag apc.cache_by_default Off

3. restart the server

Determination