Raise FD limit on Mac for simple cache backend performance.

content/browser/browser_main_loop.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/browser_main_loop.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 493 matching lines @@
   // requirement for gconf.
   g_type_init();
 #endif  // !GLIB_CHECK_VERSION(2, 35, 0)
 
   SetUpGLibLogHandler();
 #endif  // defined(USE_GLIB)
 
   if (parts_)
     parts_->PreEarlyInitialization();
 
-#if defined(OS_MACOSX)
-  // We use quite a few file descriptors for our IPC, and the default limit on
-  // the Mac is low (256), so bump it up.
-  base::SetFdLimit(1024);
-#elif defined(OS_LINUX)
+#if defined(OS_MACOSX) || defined(OS_LINUX)
+  // We use quite a few file descriptors for our IPC as well as disk the disk
+  // cache,and the default limit on the Mac is low (256), so bump it up.
+
   // Same for Linux. The default various per distro, but it is 1024 on Fedora.
   // Low soft limits combined with liberal use of file descriptors means power
   // users can easily hit this limit with many open tabs. Bump up the limit to
   // an arbitrarily high number. See https://crbug.com/539567
   base::SetFdLimit(8192);
-#endif  // default(OS_MACOSX)
+#endif  // defined(OS_MACOSX) || defined(OS_LINUX)
 
 #if defined(OS_WIN)
   net::EnsureWinsockInit();
 #endif
 
 #if defined(USE_NSS_CERTS)
   // We want to be sure to init NSPR on the main thread.
   crypto::EnsureNSPRInit();
 #endif
 
@@ skipping 1034 matching lines @@
     scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner =
         audio_thread_->task_runner();
     audio_manager_ = media::AudioManager::Create(std::move(audio_task_runner),
                                                  std::move(worker_task_runner),
                                                  MediaInternals::GetInstance());
   }
   CHECK(audio_manager_);
 }
 
 }  // namespace content