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In get_pages(), cache queries to individual cache buckets instead of storing them in one cached array. Also, store post IDs instead of full objects. This reduces overall memory usage as well as the size of the cache buckets. Use incrementor style passive cache invalidation.

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Props nprasath002
see #23167


git-svn-id: https://develop.svn.wordpress.org/trunk@23300 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Ryan Boren
2013-01-15 17:32:35 +00:00
parent 84827c87dc
commit bb70f60264
1 changed files with 23 additions and 10 deletions
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33
wp-includes/post.php
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@@ -3649,15 +3649,18 @@ function get_pages($args = '') {
if ( array_diff( $post_status, get_post_stati() ) )
return $pages;
$cache = array();
// $args can be whatever, only use the args defined in defaults to compute the key
$key = md5( serialize( compact(array_keys($defaults)) ) );
if ( $cache = wp_cache_get( 'get_pages', 'posts' ) ) {
if ( is_array($cache) && isset( $cache[ $key ] ) && is_array( $cache[ $key ] ) ) {
// Convert to WP_Post instances
$pages = array_map( 'get_post', $cache[ $key ] );
$pages = apply_filters( 'get_pages', $pages, $r );
return $pages;
}
$last_changed = wp_cache_get( 'last_changed', 'posts' );
if ( ! $last_changed )
$last_changed = wp_cache_set( 'last_changed', 1, 'posts' );
$cache_key = "get_pages:$key:$last_changed";
if ( $cache = wp_cache_get( $cache_key, 'posts' ) ) {
// Convert to WP_Post instances
$pages = array_map( 'get_post', $cache );
$pages = apply_filters('get_pages', $pages, $r);
return $pages;
}
if ( !is_array($cache) )
@@ -3827,8 +3830,11 @@ function get_pages($args = '') {
}
}
$cache[ $key ] = $pages;
wp_cache_set( 'get_pages', $cache, 'posts' );
$page_structure = array();
foreach ( $pages as $page )
$page_structure[] = $page->ID;
wp_cache_set( $cache_key, $page_structure, 'posts' );
// Convert to WP_Post instances
$pages = array_map( 'get_post', $pages );
@@ -4663,6 +4669,13 @@ function clean_post_cache( $post ) {
wp_cache_delete( 'all_page_ids', 'posts' );
do_action( 'clean_page_cache', $post->ID );
}
if ( function_exists( 'wp_cache_incr' ) ) {
wp_cache_incr( 'last_changed', 1, 'posts' );
} else {
$last_changed = wp_cache_get( 'last_changed', 'posts' );
wp_cache_set( 'last_changed', $last_changed + 1, 'posts' );
}
}
/**