core: tune performance (#73)

- Avoid using recursive function in critical path.
- Do not write through when using levelDB. Things put to
   levelDB would be safe from panic even we didn't force
   to write through every time.
- Dump count of confirmed blocks proposed by self.
- Avoid allocating variables in loop.
- Return length of acking node set, we only need that
   when total ordering.
- Fix potential bug: make sure win records updated when
   acking height vectors of candidates are changed.
- Keep dirty validators in slice.
- Add cache for objects to ease the pressure to garbage
   collector.
- Cache global acking status when total ordering.
- Add method to recycle blocks.
- Marshal JSON should be called once for each broadcast.
- Make updateWinRecord called in parallel.
- Log average / deviation of latencies when simulation
   finished.

1 files changed, 1 insertions, 1 deletions

diff --git a/simulation/app.go b/simulation/app.go
index c7a7ccf..635b071 100644
--- a/simulation/app.go
+++ b/simulation/app.go
@@ -106,7 +106,7 @@ func (a *simApp) TotalOrderingDeliver(blockHashes common.Hashes, early bool) {
 	}
 	a.Outputs = blocks
 	a.Early = early
-	fmt.Println("OUTPUT", a.ValidatorID, a.Early, a.Outputs)
+	//fmt.Println("OUTPUT", a.ValidatorID, a.Early, a.Outputs)
 
 	confirmLatency := []time.Duration{}