1 files changed, 129 insertions, 0 deletions
diff --git a/src/test/common/histogram.cc b/src/test/common/histogram.cc
new file mode 100644
index 000000000..fbecc6722
--- /dev/null
+++ b/src/test/common/histogram.cc
@@ -0,0 +1,129 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 Inktank <info@inktank.com>
+ *
+ * LGPL-2.1 (see COPYING-LGPL2.1) or later
+ */
+
+#include <iostream>
+#include <gtest/gtest.h>
+
+#include "common/histogram.h"
+#include "include/stringify.h"
+
+TEST(Histogram, Basic) {
+  pow2_hist_t h;
+
+  h.add(0);
+  h.add(0);
+  h.add(0);
+  ASSERT_EQ(3, h.h[0]);
+  ASSERT_EQ(1u, h.h.size());
+
+  h.add(1);
+  ASSERT_EQ(3, h.h[0]);
+  ASSERT_EQ(1, h.h[1]);
+  ASSERT_EQ(2u, h.h.size());
+
+  h.add(2);
+  h.add(2);
+  ASSERT_EQ(3, h.h[0]);
+  ASSERT_EQ(1, h.h[1]);
+  ASSERT_EQ(2, h.h[2]);
+  ASSERT_EQ(3u, h.h.size());
+}
+
+TEST(Histogram, Set) {
+  pow2_hist_t h;
+  h.set_bin(0, 12);
+  h.set_bin(2, 12);
+  ASSERT_EQ(12, h.h[0]);
+  ASSERT_EQ(0, h.h[1]);
+  ASSERT_EQ(12, h.h[2]);
+  ASSERT_EQ(3u, h.h.size());
+}
+
+TEST(Histogram, Position) {
+  pow2_hist_t h;
+  uint64_t lb, ub;
+  h.add(0);
+  ASSERT_EQ(-1, h.get_position_micro(-20, &lb, &ub));
+}
+
+TEST(Histogram, Position1) {
+  pow2_hist_t h;
+  h.add(0);
+  uint64_t lb, ub;
+  h.get_position_micro(0, &lb, &ub);
+  ASSERT_EQ(0u, lb);
+  ASSERT_EQ(1000000u, ub);
+  h.add(0);
+  h.add(0);
+  h.add(0);
+  h.get_position_micro(0, &lb, &ub);
+  ASSERT_EQ(0u, lb);
+  ASSERT_EQ(1000000u, ub);
+}
+
+TEST(Histogram, Position2) {
+  pow2_hist_t h;
+  h.add(1);
+  h.add(1);
+  uint64_t lb, ub;
+  h.get_position_micro(0, &lb, &ub);
+  ASSERT_EQ(0u, lb);
+  ASSERT_EQ(0u, ub);
+  h.add(0);
+  h.get_position_micro(0, &lb, &ub);
+  ASSERT_EQ(0u, lb);
+  ASSERT_EQ(333333u, ub);
+  h.get_position_micro(1, &lb, &ub);
+  ASSERT_EQ(333333u, lb);
+  ASSERT_EQ(1000000u, ub);
+}
+
+TEST(Histogram, Position3) {
+  pow2_hist_t h;
+  h.h.resize(10, 0);
+  h.h[0] = 1;
+  h.h[5] = 1;
+  uint64_t lb, ub;
+  h.get_position_micro(4, &lb, &ub);
+  ASSERT_EQ(500000u, lb);
+  ASSERT_EQ(500000u, ub);
+}
+
+TEST(Histogram, Position4) {
+  pow2_hist_t h;
+  h.h.resize(10, 0);
+  h.h[0] = UINT_MAX;
+  h.h[5] = UINT_MAX;
+  uint64_t lb, ub;
+  h.get_position_micro(4, &lb, &ub);
+  ASSERT_EQ(0u, lb);
+  ASSERT_EQ(0u, ub);
+}
+
+TEST(Histogram, Decay) {
+  pow2_hist_t h;
+  h.set_bin(0, 123);
+  h.set_bin(3, 12);
+  h.set_bin(5, 1);
+  h.decay(1);
+  ASSERT_EQ(61, h.h[0]);
+  ASSERT_EQ(6, h.h[3]);
+  ASSERT_EQ(4u, h.h.size());
+}
+
+/*
+ * Local Variables:
+ * compile-command: "cd ../.. ; make -j4 &&
+ *   make unittest_histogram &&
+ *   valgrind --tool=memcheck --leak-check=full \
+ *      ./unittest_histogram
+ *   "
+ * End:
+ */