V8 Buildbot: Remove swarming staging builders/testers.

masters/master.client.v8/slaves.cfg

Index: masters/master.client.v8/slaves.cfg
diff --git a/masters/master.client.v8/slaves.cfg b/masters/master.client.v8/slaves.cfg
index 5f7f930a1fddb108437c653e8d807eb732ca7a48..814c62009ab0bfbeffd7b0dfa43d0c923a6e58ae 100644
--- a/masters/master.client.v8/slaves.cfg
+++ b/masters/master.client.v8/slaves.cfg
@@ -40,7 +40,6 @@ slaves = [
   {
     'master': 'V8',
     'builder': ['V8 Linux - builder',
-                'V8 Linux - swarming staging builder',
                 'V8 Linux - debug builder'],
     'hostname': 'vm362-m3',
     'os': 'linux',
@@ -191,7 +190,7 @@ slaves = [
   },
   {
     'master': 'V8',
-    'builder': ['V8 Linux64 - cfi', 'V8 Linux - swarming staging 3'],
+    'builder': ['V8 Linux64 - cfi', 'V8 Linux - swarming staging'],
     'hostname': 'slave80-c3',
     'os': 'linux',
     'version': 'precise',
@@ -396,66 +395,50 @@ for vm in [631, 632, 633]:
     'bits': '64',
   })
 
-for j in xrange(3):
-  slaves.append({
-    'master': 'V8',
-    'builder': ['V8 Linux - swarming staging 1',
-                'V8 Linux - swarming staging 2'],
-    'hostname': 'slave83-c3',
-    'os': 'linux',
-    'version': 'precise',
-    'bits': '64',
-    'subdir': str(j),
-  })
+def distribute_subdir_slaves(builders, hostnames):
+  """Distributes a list of builders to a list of hostnames with subdirs.
 
-# TODO(machenbach): Refactor usage of subdir slaves. Make it easier to
-# map builders to subdir slaves from a pool.
-slaves.append({
-  'master': 'V8',
-  'builder': ['V8 Arm'],
-  'hostname': 'slave83-c3',
-  'os': 'linux',
-  'version': 'precise',
-  'bits': '64',
-  'subdir': str(3),
-})
+  Each builder will be assigned to one (subdir) slave. The different hosts will
+  have an equal number (+/- 1) of subdir slaves.
 
-slaves.append({
-  'master': 'V8',
-  'builder': ['V8 Arm - debug'],
-  'hostname': 'slave83-c3',
-  'os': 'linux',
-  'version': 'precise',
-  'bits': '64',
-  'subdir': str(4),
-})
+  Example: Distributing builders [A, B, C, D, E] to slaves [X, Y] will result
+  in [AX0, BY0, CX1, DY1, EX2], where e.g. CX1 is builder C on host X with
+  subdir 1.
+  """
+  # Assuming lists are used to ensure determinism.
+  assert type(builders) == list
+  assert type(hostnames) == list
 
-slaves.append({
-  'master': 'V8',
-  'builder': ['V8 Arm GC Stress'],
-  'hostname': 'slave83-c3',
-  'os': 'linux',
-  'version': 'precise',
-  'bits': '64',
-  'subdir': str(5),
-})
+  # Assuming there are more or equal builders than hostnames.
+  assert len(builders) >= len(hostnames)
 
-slaves.append({
-  'master': 'V8',
-  'builder': ['V8 Win32'],
-  'hostname': 'slave83-c3',
-  'os': 'linux',
-  'version': 'precise',
-  'bits': '64',
-  'subdir': str(6),
-})
+  subdir_index = 0
+  hostname_index = 0
+  for builder in builders:
+    if hostname_index >= len(hostnames):
+      # All hostnames were used, rotate and advance the subdir index.
+      hostname_index = 0
+      subdir_index += 1
+    slaves.append({
+      'master': 'V8',
+      'builder': builder,
+      'hostname': hostnames[hostname_index],
+      'os': 'linux',
+      'version': 'precise',
+      'bits': '64',
+      'subdir': str(subdir_index),
+    })
+    hostname_index += 1
 
-slaves.append({
-  'master': 'V8',
-  'builder': ['V8 Win32 - debug'],
-  'hostname': 'slave83-c3',
-  'os': 'linux',
-  'version': 'precise',
-  'bits': '64',
-  'subdir': str(7),
-})
+distribute_subdir_slaves(
+  [
+    'V8 Arm',
+    'V8 Arm - debug',
+    'V8 Arm GC Stress',
+    'V8 Win32',
+    'V8 Win32 - debug',
+  ],
+  [
+    'slave83-c3',
+  ],
+)