Have a "fast" ie-windows bot and a slower ie-windows bot.

utils/compiler/buildbot.py

Index: utils/compiler/buildbot.py
===================================================================
--- utils/compiler/buildbot.py	(revision 9412)
+++ utils/compiler/buildbot.py	(working copy)
@@ -181,10 +181,16 @@
   os.chdir(DART_PATH)
 
   if system.startswith('win') and runtime == 'ie':
+    # We don't do proper sharding on the IE bots, since the runtime is
+    # long for both. We have a "fast bot" and a "slow bot" that run specific
+    # tests instead.
+    for i in flags:
+      if i.startswith('--shard='):
+        bot_num = i.split('=')[1]
     # There should not be more than one InternetExplorerDriver instance
     # running at a time. For details, see
     # http://code.google.com/p/selenium/wiki/InternetExplorerDriver.
-    flags = flags + ['-j1']
+    flags = filter(lambda(item): not item.startswith('--shard'), flags) + ['-j1']

[ricow1, 2012/07/05 11:10:39]

you might also want to remove --shards to not have any confusion.

[Emily Fortuna, 2012/07/05 12:01:28]

this will remove both --shard= and --shards=

[ricow1, 2012/07/05 12:04:49]

oh, .startswith, sorry

 
   if system == 'linux' and runtime == 'chrome':
     # TODO(ngeoffray): We should install selenium on the buildbot.
@@ -199,12 +205,24 @@
       # that run the browser tests to cut down on the cycle time.
       TestStep("dart2js_unit", mode, system, 'none', 'vm', ['dart2js'], flags)
 
-    # Run the default set of test suites.
-    TestStep("dart2js", mode, system, 'dart2js', runtime, [], flags)
+    if not (system.startswith('win') and runtime == 'ie'):
+      # Run the default set of test suites.
+      TestStep("dart2js", mode, system, 'dart2js', runtime, [], flags)
 
-    # TODO(kasperl): Consider running peg and css tests too.
-    extras = ['dart2js_extra', 'dart2js_native']
-    TestStep("dart2js_extra", mode, system, 'dart2js', runtime, extras, flags)
+      # TODO(kasperl): Consider running peg and css tests too.
+      extras = ['dart2js_extra', 'dart2js_native']
+      TestStep("dart2js_extra", mode, system, 'dart2js', runtime, extras, flags)
+    else:
+      if bot_num == '1':
+        TestStep("dart2js", mode, system, 'dart2js', runtime, ['html'], flags)
+      else:
+        TestStep("dart2js", mode, system, 'dart2js', runtime, ['dartc',
+            'samples', 'standalone', 'corelib', 'co19', 'language', 'isolate',
+            'vm', 'json', 'benchmark_smoke', 'dartdoc', 'utils', 'pub', 'lib'],

[Emily Fortuna, 2012/07/05 10:18:02]

alternatively, instead of explicitly listing all of these (which is annoying
because we'd have to remember to add new "default tests" here too, is to just
send the empty list, in which case it will run all the tests (including the
'html' tests again)

+            flags)
+        extras = ['dart2js_extra', 'dart2js_native']
+        TestStep("dart2js_extra", mode, system, 'dart2js', runtime, extras,
+            flags)
 
   elif compiler == 'frog':
     TestStep("frog", mode, system, compiler, runtime, [], flags)