diff --git a/base/PerfOptions.php b/base/PerfOptions.php
index f0ce292..426d57c 100644
--- a/base/PerfOptions.php
+++ b/base/PerfOptions.php
@@ -568,6 +568,7 @@ private function getTargetDefinitions(
       'drupal8-no-cache' => () ==> new Drupal8NoCacheTarget($this),
       'mediawiki' => () ==> new MediaWikiTarget($this),
       'mediawiki-mlp' => () ==> new MediaWikiMLPTarget($this),
+      'mediawiki-mem' => () ==> new MediaWikiMemTarget($this),
       'laravel4-hello-world' => () ==> new Laravel4Target($this),
       'laravel5-hello-world' => () ==> new Laravel5Target($this),
       'sugarcrm-login-page' => () ==> new SugarCRMLoginPageTarget($this),
diff --git a/targets/mediawiki/MediaWikiMemTarget.php b/targets/mediawiki/MediaWikiMemTarget.php
new file mode 100644
index 0000000..29573b6
--- /dev/null
+++ b/targets/mediawiki/MediaWikiMemTarget.php
@@ -0,0 +1,90 @@
+<?hh
+/*
+ *  Copyright (c) 2014-present, Facebook, Inc.
+ *  All rights reserved.
+ *
+ *  This source code is licensed under the MIT license found in the
+ *  LICENSE file in the root directory of this source tree.
+ *
+ */
+
+final class MediaWikiMemTarget extends PerfTarget {
+
+  const MEDIAWIKI_VERSION = 'mediawiki-1.28.0';
+
+  public function __construct(private PerfOptions $options) {}
+
+  protected function getSanityCheckString(): string {
+    return 'Obama';
+  }
+
+  private function replaceInFile(string $fileName, string $search, string $replace) {
+    $file = $this->getSourceRoot().'/'.$fileName;
+    $file_contents = file_get_contents($file);
+    $file_contents = str_replace($search, $replace, $file_contents);
+    file_put_contents($file, $file_contents);
+  }
+
+  public function install(): void {
+    $src_dir = $this->options->srcDir;
+    if ($src_dir) {
+      Utils::CopyDirContents($src_dir, $this->getSourceRoot());
+    } else {
+      Utils::ExtractTar(
+         __DIR__.'/'.self::MEDIAWIKI_VERSION.'.tar.gz',
+        $this->options->tempDir,
+      );
+    }
+    (new DatabaseInstaller($this->options))
+      ->setDatabaseName('mw_bench')
+      ->setDumpFile(__DIR__.'/mw_bench.sql.gz')
+      ->installDatabase();
+
+    // Put it inside the source root so that if we're generating PHP files and
+    // we're in repo-auth mode, the generated files end up in the repo
+    $cache_dir = $this->getSourceRoot().'/mw-cache';
+    mkdir($cache_dir);
+    copy(__DIR__.'/LocalSettings.php', $this->getSourceRoot().'/LocalSettings.php');
+
+    $this->replaceInFile('LocalSettings.php', '__DB_HOST__', $this->options->dbHost);
+
+    file_put_contents(
+      $this->getSourceRoot().'/LocalSettings.php',
+      '$wgCacheDirectory="'.$cache_dir.'";'."\n",
+      FILE_APPEND,
+    );
+    if ($this->options->useMemcached) {
+      copy(__DIR__.'/Memcached.php', $this->getSourceRoot().'/Memcached.php');
+      $this->replaceInFile('Memcached.php', '__MEMCACHED_HOST__', 'localhost');
+      $this->replaceInFile('Memcached.php', '__MEMCACHED_PORT__', (string) $this->options->memcachedPort);
+      file_put_contents(
+        $this->getSourceRoot().'/LocalSettings.php',
+        'require_once "'.$this->getSourceRoot().'/Memcached.php";'."\n",
+        FILE_APPEND,
+      );
+    }
+    copy(__DIR__.'/mem_mlp.php', $this->getSourceRoot().'/mem_mlp.php');
+    copy(__DIR__.'/lambdachase.php', $this->getSourceRoot().'/lambdachase.php');
+  }
+
+  <<__Override>>
+  public function postInstall(): void {
+    Utils::RunCommand(
+      Vector {
+        PHP_BINARY,
+        $this->getSourceRoot().'/maintenance/rebuildLocalisationCache.php',
+        '--lang=en',
+      },
+    );
+  }
+
+  <<__Override>>
+  public function getSourceRoot(): string {
+    return $this->options->tempDir.'/'.self::MEDIAWIKI_VERSION;
+  }
+
+  <<__Override>>
+  public function supportsMemcached(): bool {
+    return true;
+  }
+}
diff --git a/targets/mediawiki/MediaWikiMemTarget.urls b/targets/mediawiki/MediaWikiMemTarget.urls
new file mode 100644
index 0000000..a106931
--- /dev/null
+++ b/targets/mediawiki/MediaWikiMemTarget.urls
@@ -0,0 +1,140 @@
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page&printable=yes
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Talk:Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Talk:Main_Page&action=edit
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Special:UserLogin
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=HHVM
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Talk:Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Special:UserLogin
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Talk:Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=HHVM&action=history
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page&action=history
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=HHVM
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=HHVM
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page&action=edit
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Special:UserLogin
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Special:RecentChanges
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=HHVM
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page&printable=yes
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Talk:Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Special:UserLogin
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Special:RecentChanges
+http://__HTTP_HOST__:__HTTP_PORT__/mem_mlp.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=HHVM
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/lambdachase.php
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Talk:Main_Page
+http://__HTTP_HOST__:__HTTP_PORT__/index.php?title=Special:UserLogin
diff --git a/targets/mediawiki/lambdachase.php b/targets/mediawiki/lambdachase.php
new file mode 100644
index 0000000..83fe824
--- /dev/null
+++ b/targets/mediawiki/lambdachase.php
@@ -0,0 +1,56 @@
+<?hh // strict
+class Lambdas {
+  const NUM_LAMBDAS = 20000;
+
+
+  public static function getLambdas(): dict<string, mixed> {
+    $m = dict[];
+    for ($i = 0; $i < self::NUM_LAMBDAS-1; $i++) {
+      $key = "lambda".\strval($i);
+      $next = "lambda".\strval($i+1);
+      $m[$key] = self::lambda($next);
+      $m["num".\strval($i)] = vec[$i];
+    }
+    $key = "lambda".\strval(self::NUM_LAMBDAS - 1);
+    $next = "lambda0";
+    $m[$key] = self::lambda($next);
+    return $m;
+  }
+
+  public static function lambda(string $s): (function (string): string) {
+    return function(string $x): string use ($s) { return $s; };
+  }
+
+}
+
+class LambdaChase {
+  const CHASE_COUNT = 40000;
+
+  public function helloWorld(): string {
+    return 'Hello, world!';
+  }
+
+  public function go(): int {
+    $count = 0;
+    $next_f = "lambda0";
+    $lambdas = Lambdas::getLambdas();
+    for ($i = 1; $i < LambdaChase::CHASE_COUNT; ++$i) {
+      $f = $lambdas[$next_f];
+      $next_f = $f($next_f);
+      $f = $lambdas[$next_f];
+      $next_f = $f($next_f);
+      $f = $lambdas[$next_f];
+      $next_f = $f($next_f);
+      $count += 3;
+    }
+    return $count;
+  }
+}
+
+<<__EntryPoint>>
+async function main(): Awaitable<void> {
+  $chase = new LambdaChase();
+  printf("%s\n", $chase->helloWorld());
+  printf("%d\n", $chase->go());
+  exit(0);
+}
diff --git a/targets/mediawiki/mem_mlp.php b/targets/mediawiki/mem_mlp.php
new file mode 100644
index 0000000..1390e40
--- /dev/null
+++ b/targets/mediawiki/mem_mlp.php
@@ -0,0 +1,71 @@
+<?hh // strict
+
+ini_set('memory_limit', '1024M');
+
+
+class MemMLPChase {
+  const ARRAY_LENGTH = 1 << 22;
+
+  async public function mlp(array $bigArray, int $hits): Awaitable<string> {
+    $val1 = 'index1';
+    $val2 = 'index2';
+    $val3 = 'index3';
+    $val4 = 'index4';
+
+    $hits_per_lane = $hits/5;
+    for ($i = 0; $i < $hits_per_lane; $i++) {
+      $val1 = $bigArray[$val1];
+      $val2 = $bigArray[$val2];
+      $val3 = $bigArray[$val3];
+      $val4 = $bigArray[$val4];
+
+    }
+    return $val1.$val2.$val3.$val4;
+  }
+
+}
+
+
+<<__EntryPoint>>
+async function main(): Awaitable<void> {
+  $hits = 1 * 4 * 5 * 6 * 7 * 8 * 9 * 6;
+  $arrayIdx = rand(1, 30);
+  $arrayName = "big-array-".\strval($arrayIdx);
+  printf("%s\n",$arrayName);
+  $bigArray = \apc_fetch($arrayName);
+  if (!$bigArray) {
+    $tagName = "array-tag-".\strval($arrayIdx);
+    $arrayTag = \apc_fetch($tagName);
+    if ($arrayTag) {
+      exit(0);
+    } else {
+      $backoffTime = 1000 * rand(1, 1000);
+      usleep($backoffTime);
+      $arrayTag = \apc_fetch($tagName);
+      if ($arrayTag) {
+        exit(0);
+      }
+    }
+    \apc_add($tagName, $arrayName);
+    $a = [];
+    for ($i = 0; $i < MemMLPChase::ARRAY_LENGTH-1; $i++) {
+      $i_next = $i+1;
+      $a['index'.\strval($i)] = 'index'.\strval($i_next);
+    }
+    $keys = \array_keys($a);
+    \shuffle(&$keys);
+    foreach ($keys as $key) {
+      $bigArray[$key] = $a[$key];
+    }
+    $bigArray['index'.\strval(MemMLPChase::ARRAY_LENGTH-1)] = 'index0';
+    \apc_add($arrayName, $bigArray);
+  }
+
+  $chase = new MemMLPChase();
+  $count = await $chase->mlp(
+	$bigArray,
+	$hits,
+  );
+  printf("%s\n",$count);
+  exit(0);
+}
diff --git a/targets/mediawiki/mlp.php b/targets/mediawiki/mlp.php
index ca2404d..fb7a40b 100644
--- a/targets/mediawiki/mlp.php
+++ b/targets/mediawiki/mlp.php
@@ -41,10 +41,10 @@ class MLPChase {
     $bigArray['index'.\strval(MLPChase::ARRAY_LENGTH-1)] = 'index0';
     \apc_add("my-array", $bigArray);
   }
-  
+
   $chase = new MLPChase();
   $count = await $chase->mlp(
-	$bigArray, 
+	$bigArray,
 	$hits,
   );
   printf("%s\n",$count);