Add a fairly pants TRUNCATE vs DELETE benchmark...

diff --git a/maintenance/benchmarks/bench_delete_truncate.php b/maintenance/benchmarks/bench_delete_truncate.php
new file mode 100644 (file)
index 0000000..3a09e14
--- /dev/null
+++ b/maintenance/benchmarks/bench_delete_truncate.php
@@ -0,0 +1,78 @@
+<?php
+
+require_once( dirname( __FILE__ ) . '/Benchmarker.php' );
+
+class BenchmarkPurge extends Benchmarker {
+
+       public function __construct() {
+               parent::__construct();
+               $this->mDescription = "Benchmarks SQL DELETE vs SQL TRUNCATE.";
+       }
+
+       public function execute() {
+               $dbw = wfGetDB( DB_MASTER );
+
+               $test = $dbw->tableName( 'test' );
+               $dbw->doQuery( "CREATE TABLE IF NOT EXISTS /*_*/$test (
+  test_id int unsigned NOT NULL PRIMARY KEY AUTO_INCREMENT,
+  text varbinary(255) NOT NULL
+);" );
+
+               $this->insertData( $dbw );
+
+               $start = wfTime();
+
+               $this->delete( $dbw );
+
+               $end = wfTime();
+
+               echo "Delete: " . $end - $start;
+               echo "\r\n";
+
+               $this->insertData( $dbw );
+
+               $start = wfTime();
+
+               $this->truncate( $dbw );
+
+               $end = wfTime();
+
+               echo "Truncate: " . $end - $start;
+               echo "\r\n";
+
+               $dbw->dropTable( 'test' );
+       }
+
+       /**
+        * @param  $dbw DatabaseBase
+        * @return void
+        */
+       private function insertData( $dbw ) {
+               $range = range( 0, 1024 );
+               $data = array();
+               foreach( $range as $r ) {
+                       $data[] = array( 'text' => $r );
+               }
+               $dbw->insert( 'test', $data, __METHOD__ );
+       }
+
+       /**
+        * @param  $dbw DatabaseBase
+        * @return void
+        */
+       private function delete( $dbw ) {
+               $dbw->delete( 'text', '*', __METHOD__ );
+       }
+
+       /**
+        * @param  $dbw DatabaseBase
+        * @return void
+        */
+       private function truncate( $dbw ) {
+               $test = $dbw->tableName( 'test' );
+               $dbw->doQuery( "TRUNCATE TABLE $test" );
+       }
+}
+
+$maintClass = "BenchmarkPurge";
+require_once( RUN_MAINTENANCE_IF_MAIN );
\ No newline at end of file