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More performance improvements to metadata lazyloading.

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Comment and term meta lazyloading for `WP_Query` loops, introduced in 4.4,
depended on filter callback methods belonging to `WP_Query` objects. This meant
storing `WP_Query` objects in the `$wp_filter` global (via `add_filter()`),
requiring that PHP retain the objects in memory, even when the local variables
would typically be expunged during normal garbage collection. In cases where a
large number of `WP_Query` objects were instantiated on a single pageload,
and/or where the contents of the `WP_Query` objects were quite large, serious
performance issues could result.

We skirt this problem by moving metadata lazyloading out of `WP_Query`. The
new `WP_Metadata_Lazyloader` class acts as a lazyload queue. Query instances
register items whose metadata should be lazyloaded - such as post terms, or
comments - and a `WP_Metadata_Lazyloader` method will intercept comment and
term meta requests to perform the cache priming. Since `WP_Metadata_Lazyloader`
instances are far smaller than `WP_Query` (containing only object IDs), and
clean up after themselves far better than the previous `WP_Query` methods (bp
only running their callbacks a single time for a given set of queued objects),
the resource use is decreased dramatically.

See [36525] for an earlier step in this direction.

Props lpawlik, stevegrunwell, boonebgorges.
Fixes #35816.

git-svn-id: https://develop.svn.wordpress.org/trunk@36566 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Boone Gorges
2016-02-17 22:57:33 +00:00
parent c7936b8785
commit 28fad09b61
8 changed files with 267 additions and 185 deletions
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tests/phpunit/tests/term/meta.php
+5 -90
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@@ -134,107 +134,22 @@ class Tests_Term_Meta extends WP_UnitTestCase {
// First request will hit the database.
$num_queries = $wpdb->num_queries;
$this->assertSame( 'bar', get_term_meta( $terms[0], 'foo', true ) );
$this->assertSame( $num_queries + 1, $wpdb->num_queries );
$num_queries++;
$this->assertSame( $num_queries, $wpdb->num_queries );
// Second and third requests should be in cache.
$this->assertSame( 'bar', get_term_meta( $terms[1], 'foo', true ) );
$this->assertSame( 'bar', get_term_meta( $terms[2], 'foo', true ) );
$this->assertSame( $num_queries + 1, $wpdb->num_queries );
$this->assertSame( $num_queries, $wpdb->num_queries );
// Querying a term not primed should result in a hit.
$num_queries++;
$this->assertSame( 'bar', get_term_meta( $orphan_term, 'foo', true ) );
$this->assertSame( $num_queries + 2, $wpdb->num_queries );
$this->assertSame( $num_queries, $wpdb->num_queries );
}
}
}
/**
* @ticket 34073
*/
public function test_term_meta_should_be_lazy_loaded_only_for_the_queries_in_which_the_term_has_posts() {
global $wpdb;
$posts = self::factory()->post->create_many( 3, array( 'post_status' => 'publish' ) );
register_taxonomy( 'wptests_tax', 'post' );
$terms = self::factory()->term->create_many( 6, array( 'taxonomy' => 'wptests_tax' ) );
wp_set_object_terms( $posts[0], array( $terms[0], $terms[1] ), 'wptests_tax' );
wp_set_object_terms( $posts[1], array( $terms[2], $terms[3] ), 'wptests_tax' );
wp_set_object_terms( $posts[2], array( $terms[0], $terms[4], $terms[5] ), 'wptests_tax' );
foreach ( $terms as $t ) {
add_term_meta( $t, 'foo', 'bar' );
}
$q0 = new WP_Query( array( 'p' => $posts[0], 'cache_results' => true ) );
$q1 = new WP_Query( array( 'p' => $posts[1], 'cache_results' => true ) );
$q2 = new WP_Query( array( 'p' => $posts[2], 'cache_results' => true ) );
/*
* $terms[0] belongs to both $posts[0] and $posts[2], so `get_term_meta( $terms[0] )` should prime
* the cache for term matched by $q0 and $q2.
*/
// First request will hit the database.
$num_queries = $wpdb->num_queries;
// Prime caches.
$this->assertSame( 'bar', get_term_meta( $terms[0], 'foo', true ) );
// Two queries: one for $q0 and one for $q2.
$num_queries += 2;
$this->assertSame( $num_queries, $wpdb->num_queries );
// Next requests should be in cache.
$this->assertSame( 'bar', get_term_meta( $terms[1], 'foo', true ) );
$this->assertSame( 'bar', get_term_meta( $terms[4], 'foo', true ) );
$this->assertSame( 'bar', get_term_meta( $terms[5], 'foo', true ) );
$this->assertSame( $num_queries, $wpdb->num_queries );
// Querying for $terms[2] will prime $terms[3] as well.
$this->assertSame( 'bar', get_term_meta( $terms[2], 'foo', true ) );
$num_queries++;
$this->assertSame( $num_queries, $wpdb->num_queries );
$this->assertSame( 'bar', get_term_meta( $terms[3], 'foo', true ) );
$this->assertSame( $num_queries, $wpdb->num_queries );
}
public function test_adding_term_meta_should_bust_get_terms_cache() {
$terms = self::factory()->term->create_many( 2, array( 'taxonomy' => 'wptests_tax' ) );
add_term_meta( $terms[0], 'foo', 'bar' );
// Prime cache.
$found = get_terms( 'wptests_tax', array(
'hide_empty' => false,
'fields' => 'ids',
'meta_query' => array(
array(
'key' => 'foo',
'value' => 'bar',
),
),
) );
$this->assertEqualSets( array( $terms[0] ), $found );
add_term_meta( $terms[1], 'foo', 'bar' );
$found = get_terms( 'wptests_tax', array(
'hide_empty' => false,
'fields' => 'ids',
'meta_query' => array(
array(
'key' => 'foo',
'value' => 'bar',
),
),
) );
$this->assertEqualSets( array( $terms[0], $terms[1] ), $found );
}
public function test_updating_term_meta_should_bust_get_terms_cache() {
$terms = self::factory()->term->create_many( 2, array( 'taxonomy' => 'wptests_tax' ) );