Reviewers: Yang,
Description:
Add flag for printing the time it took to deserialize the snapshot.
BUG=
Please review this at https://codereview.chromium.org/25695002/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files (+15, -1 lines):
M src/flag-definitions.h
M src/snapshot-common.cc
Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index
f4df2b950d508292d0d18fd30594768e030bda9c..76471715d3b001c7efb69ccd806ec5682fb277fe
100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -595,6 +595,11 @@ DEFINE_int(hash_seed,
"Fixed seed to use to hash property keys (0 means random)"
"(with snapshots this option cannot override the baked-in
seed)")
+// snapshot-common.cc
+DEFINE_bool(profile_deserialization,
+ false,
+ "Print the time it takes to deserialize the snapshot.")
+
// v8.cc
DEFINE_bool(preemption, false,
"activate a 100ms timer that switches between V8 threads")
Index: src/snapshot-common.cc
diff --git a/src/snapshot-common.cc b/src/snapshot-common.cc
index
96034e352bc33ebbe8cc1c3b6e5d41667a81f107..4bdf63ceddbf1e1a5670564a7653b50c92d0b5ac
100644
--- a/src/snapshot-common.cc
+++ b/src/snapshot-common.cc
@@ -102,10 +102,19 @@ bool Snapshot::Initialize(const char* snapshot_file) {
DeleteArray(str);
return success;
} else if (size_ > 0) {
+ ElapsedTimer timer;
+ if (FLAG_profile_deserialization) {
+ timer.Start();
+ }
SnapshotByteSource source(raw_data_, raw_size_);
Deserializer deserializer(&source);
ReserveSpaceForLinkedInSnapshot(&deserializer);
- return V8::Initialize(&deserializer);
+ bool success = V8::Initialize(&deserializer);
+ if (FLAG_profile_deserialization) {
+ double ms = timer.Elapsed().InMillisecondsF();
+ PrintF("[Snapshot loading and deserialization took %0.3f ms]\n", ms);
+ }
+ return success;
}
return false;
}
--
--
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