[go-nuts] Go locking and channels much slower than Java equivalent, program spends most of time in sync.(*Mutex).Lock() and sync.(*Mutex).Unlock()

[Sokolov Yura]

Try this:

    func (store *Store) addToStore(destination map[string]*Distribution, key 
string, value int64) {
       store.lock.Lock()
       distribution, exists := destination[key]
       if !exists {
          store.lock.Unlock()
          distribution = NewDistribution()
          distribution.addSample(value)
          store.lock.Lock()
          distr, ex := destination[key]
          if !ex {
              destination[key] = distribution
              store.lock.Unlock()
              return
          }
          distribution = distr
       }
       distribution.addSample(value)
       store.lock.Unlock()
    }

So, lock around allocation eliminated. (and no defer :-) )

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