Add --print-benchmarking-metrics to the VM for Golem.

runtime/vm/isolate.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/text_buffer.h"
@@ skipping 1164 matching lines @@
     if (event != NULL) {
       event->Instant("Runnable");
       event->Complete();
     }
   }
   if (FLAG_support_service && Service::isolate_stream.enabled()) {
     ServiceEvent runnableEvent(this, ServiceEvent::kIsolateRunnable);
     Service::HandleEvent(&runnableEvent);
   }
 #endif  // !PRODUCT
+  if (FLAG_print_benchmarking_metrics) {
+    // is_service_isolate not set yet.
+    if (!ServiceIsolate::NameEquals(name())) {
+      int64_t uptime = OS::GetCurrentTimeMicros() - start_time();

[sortie, 2016/12/14 19:09:52]

This interval seems to be measure in wall seconds (subject to time changes, leap
second smearing, etc.) rather than monotonic time.

[rmacnak, 2016/12/16 19:10:22]

Fixed this in another CL.

+      OS::Print("MakeRunnable(Latency): %" Pd64 " us.\n", uptime);

[Cutch, 2016/12/14 18:34:36]

Please use the metric support in metrics.h instead of rolling your own.

+      {
+        StartIsolateScope scope(this);
+        heap()->CollectAllGarbage();
+      }
+      int64_t heap_size = (heap()->UsedInWords(Heap::kNew) * kWordSize) +
+                          (heap()->UsedInWords(Heap::kOld) * kWordSize);
+      OS::Print("MakeRunnable(HeapSize): %" Pd64 " B.\n", heap_size);
+    }
+  }
   return true;
 }
 
 
 bool Isolate::VerifyPauseCapability(const Object& capability) const {
   return !capability.IsNull() && capability.IsCapability() &&
          (pause_capability() == Capability::Cast(capability).Id());
 }
 
 
@@ skipping 1747 matching lines @@
 void IsolateSpawnState::DecrementSpawnCount() {
   ASSERT(spawn_count_monitor_ != NULL);
   ASSERT(spawn_count_ != NULL);
   MonitorLocker ml(spawn_count_monitor_);
   ASSERT(*spawn_count_ > 0);
   *spawn_count_ = *spawn_count_ - 1;
   ml.Notify();
 }
 
 }  // namespace dart