{
                GC.ProfileStats stats = GC.profileStats;
                if (stats.numCollections != lastGCStats_.numCollections) {
                    GC.Stats sts = GC.stats;
                    writeLog("GC run %s, %s  %s/%s bytes used".format(stats.numCollections, stats.totalCollectionTime - lastGCStats_.totalCollectionTime, sts.usedSize, sts.usedSize + sts.freeSize));

                    lastGCStats_ = stats;
                }
            }