Beispiel #1
0
 // The rate estimate is in blocks per second.
 void compute_desired(size_t count,
                      float inter_sweep_current,
                      float inter_sweep_estimate,
                      float intra_sweep_estimate) {
   // If the latest inter-sweep time is below our granularity
   // of measurement, we may call in here with
   // inter_sweep_current == 0. However, even for suitably small
   // but non-zero inter-sweep durations, we may not trust the accuracy
   // of accumulated data, since it has not been "integrated"
   // (read "low-pass-filtered") long enough, and would be
   // vulnerable to noisy glitches. In such cases, we
   // ignore the current sample and use currently available
   // historical estimates.
   assert(prev_sweep() + split_births() + coal_births()        // "Total Production Stock"
          >= split_deaths() + coal_deaths() + (ssize_t)count, // "Current stock + depletion"
          "Conservation Principle");
   if (inter_sweep_current > _threshold) {
     ssize_t demand = prev_sweep() - (ssize_t)count + split_births() + coal_births()
                      - split_deaths() - coal_deaths();
     assert(demand >= 0,
            err_msg("Demand (" SSIZE_FORMAT ") should be non-negative for "
                    PTR_FORMAT " (size=" SIZE_FORMAT ")",
                    demand, p2i(this), count));
     // Defensive: adjust for imprecision in event counting
     if (demand < 0) {
       demand = 0;
     }
     float old_rate = _demand_rate_estimate.padded_average();
     float rate = ((float)demand)/inter_sweep_current;
     _demand_rate_estimate.sample(rate);
     float new_rate = _demand_rate_estimate.padded_average();
     ssize_t old_desired = _desired;
     float delta_ise = (CMSExtrapolateSweep ? intra_sweep_estimate : 0.0);
     _desired = (ssize_t)(new_rate * (inter_sweep_estimate + delta_ise));
     if (PrintFLSStatistics > 1) {
       gclog_or_tty->print_cr("demand: " SSIZE_FORMAT ", old_rate: %f, current_rate: %f, "
                              "new_rate: %f, old_desired: " SSIZE_FORMAT ", new_desired: " SSIZE_FORMAT,
                               demand, old_rate, rate, new_rate, old_desired, _desired);
     }
   }
 }
void AdaptiveFreeList<FreeChunk>::print_on(outputStream* st, const char* c) const {
  if (c != NULL) {
    st->print("%16s", c);
  } else {
    st->print(SIZE_FORMAT_W(16), size());
  }
  st->print("\t"
           SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t"
           SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\t" SSIZE_FORMAT_W(14) "\n",
           bfr_surp(),             surplus(),             desired(),             prev_sweep(),           before_sweep(),
           count(),               coal_births(),          coal_deaths(),          split_births(),         split_deaths());
}