Object Cache Hit Rate in the Admin Bar
Shows administrators the object cache hit rate, hits and misses for the current page in the admin bar, to check whether Redis or Memcached is actually helping.
Opens WPIDE on
Code
// Added just before the bar renders, so most of the page's cache calls are counted.
add_action( 'wp_before_admin_bar_render', function () {
global $wp_object_cache, $wp_admin_bar;
if ( ! current_user_can( 'manage_options' ) || ! is_object( $wp_object_cache ) || ! $wp_admin_bar ) {
return;
}
$hits = isset( $wp_object_cache->cache_hits ) ? (int) $wp_object_cache->cache_hits : 0;
$misses = isset( $wp_object_cache->cache_misses ) ? (int) $wp_object_cache->cache_misses : 0;
$total = $hits + $misses;
$rate = $total ? round( $hits / $total * 100, 1 ) : 0;
$wp_admin_bar->add_node( array(
'id' => 'wpide-object-cache',
'parent' => 'top-secondary',
'title' => esc_html( sprintf( 'Cache %s%% %s', $rate, wp_using_ext_object_cache() ? '(persistent)' : '(runtime)' ) ),
'meta' => array( 'title' => sprintf( '%d hits, %d misses', $hits, $misses ) ),
) );
} );Notes
Without a persistent object cache the numbers only cover the current request.
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