1 files changed, 64 insertions, 0 deletions
diff --git a/emulator/qtools/hist_trace.cpp b/emulator/qtools/hist_trace.cpp
new file mode 100644
index 0000000..d2c6a90
--- /dev/null
+++ b/emulator/qtools/hist_trace.cpp
@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include "trace_reader.h"
+
+static const int kMaxHistEntries = 256;
+static const int kMaxHistEntries2 = kMaxHistEntries /  2;
+int hist[kMaxHistEntries];
+int underflow, overflow;
+
+int main(int argc, char **argv) {
+  if (argc != 2) {
+    fprintf(stderr, "Usage: %s trace_file\n", argv[0]);
+    exit(1);
+  }
+
+  char *trace_filename = argv[1];
+  TraceReaderBase *trace = new TraceReaderBase;
+  trace->Open(trace_filename);
+
+  uint64_t prev_bb_num = 0;
+  uint64_t prev_time = 0;
+  int total = 0;
+  
+  while (1) {
+    BBEvent event;
+
+    if (trace->ReadBB(&event))
+      break;
+    int bb_diff = event.bb_num - prev_bb_num;
+    //int time_diff = event.time - prev_time;
+    //printf("bb_num: %llu prev: %llu, diff: %d\n",
+    // event.bb_num, prev_bb_num, bb_diff);
+    prev_bb_num = event.bb_num;
+    prev_time = event.time;
+
+    bb_diff += kMaxHistEntries2;
+    if (bb_diff < 0)
+      underflow += 1;
+    else if (bb_diff >= kMaxHistEntries)
+      overflow += 1;
+    else
+      hist[bb_diff] += 1;
+    total += 1;
+  }
+
+  int sum = 0;
+  double sum_per = 0;
+  double per = 0;
+  for (int ii = 0; ii < kMaxHistEntries; ++ii) {
+    if (hist[ii] == 0)
+      continue;
+    per = 100.0 * hist[ii] / total;
+    sum += hist[ii];
+    sum_per = 100.0 * sum / total;
+    printf(" %4d: %6d %6.2f %6.2f\n", ii - kMaxHistEntries2, hist[ii], per, sum_per);
+  }
+  per = 100.0 * underflow / total;
+  printf("under: %6d %6.2f\n", underflow, per);
+  per = 100.0 * overflow / total;
+  printf("over:  %6d %6.2f\n", overflow, per);
+  printf("total: %6d\n", total);
+  return 0;
+}