Drupal/cache

clean memcache
http://stackoverflow.com/questions/3724838/will-restarting-apache-clear-my-memcache-contents
=====================================
telnet localhost 11211
flush_all
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http://stackoverflow.com/questions/8164376/how-to-cache-a-php-generated-xml-file-in-drupal

/**
 * Implement hook_menu()
 * to define path for our xml file.
 */
function mymodule_menu() {
    $items = array();
    $items['map.xml'] = array(
        'title' => 'Map xml',
        'page callback' => 'map_get_xml',
        'access arguments' => TRUE,
        'type' => MENU_CALLBACK
    );
    return $items;
}

/**
 * Your custom function for xml file.
 */
function map_get_xml() {
    $cache = cache_get('your-cache-id');
    $xml = $cache->data;

    if (!$xml) {
        $xml = ... // perform your code to generate your XML

        cache_set('your-cache-id', $xml);
    }

    drupal_set_header("Content-Type:text/xml");
    print $xml;
    exit();
}

==========================================

<?php
function MY_MODULE_cron() {

 $content = MY_MODULE_xml();
 file_put_contents($_SERVER['DOCUMENT_ROOT'] . file_directory_path() . '/MY_FILE.XML', $content);

}

function MY_MODULE_xml() {

$page_content = '<?xml version="1.0" encoding="UTF-8"?>
...';

return $page_content;

}

?>