Update the table of RAM vs number of renderers

- revised my guesstimate of 25 MB per renderer to 40MB, which I think is more appropiate for long lived tabs, since short lived tabs don't really matter here.
- the lower end (< 1GB) has less total renderers
- the middle has about the same
- the upper end (> 2GB) has more renderers
- added test to open 34 tabs.

Review URL: http://codereview.chromium.org/21484

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@10024 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 20 insertions, 5 deletions

diff --git a/chrome/browser/renderer_host/render_process_host.cc b/chrome/browser/renderer_host/render_process_host.cc
index 7a9ede0..ad44ac8 100644
--- a/chrome/browser/renderer_host/render_process_host.cc
+++ b/chrome/browser/renderer_host/render_process_host.cc
@@ -16,12 +16,27 @@ unsigned int GetMaxRendererProcessCount() {
   // amount of installed memory as reported by the OS. The table
   // values are calculated by assuming that you want the renderers to
   // use half of the installed ram and assuming that each tab uses
-  // ~25MB.
+  // ~40MB, however the curve is not linear but piecewise linear with
+  // interleaved slopes of 3 and 2.
+  // If you modify this table you need to adjust browser\browser_uitest.cc
+  // to match the expected number of processes.
+
   static const int kMaxRenderersByRamTier[] = {
-    4,                                  // less than 256MB
-    8,                                  // 256MB
-    12,                                 // 512MB
-    16,                                 // 768MB
+    3,                        // less than 256MB
+    6,                        //  256MB
+    9,                        //  512MB
+    12,                       //  768MB
+    14,                       // 1024MB
+    18,                       // 1280MB
+    20,                       // 1536MB
+    22,                       // 1792MB
+    24,                       // 2048MB
+    26,                       // 2304MB
+    29,                       // 2560MB
+    32,                       // 2816MB
+    35,                       // 3072MB
+    38,                       // 3328MB
+    40                        // 3584MB
   };
 
   static unsigned int max_count = 0;