From: Radoslaw Zarzynski <rzarzyns@redhat.com>
Date: Fri, 7 Sep 2018 21:20:02 +0000 (+0200)
Subject: tests, common: introduce bufferlist::apennd benchmark.
X-Git-Tag: v14.0.1~55^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=d809316ce36bb1a36ccc71be8fdf56460478d1e3;p=ceph.git

tests, common: introduce bufferlist::apennd benchmark.

Signed-off-by: Radoslaw Zarzynski <rzarzyns@redhat.com>
---

diff --git a/src/test/bufferlist.cc b/src/test/bufferlist.cc
index e1d51df8278d..baca6a469f1b 100644
--- a/src/test/bufferlist.cc
+++ b/src/test/bufferlist.cc
@@ -872,7 +872,7 @@ TEST(BufferPtr, append_bench) {
       bufferptr bp(buflen);
       bp.set_length(0);
       for (int64_t j=0; j<buflen; j += s) {
-	bp.append(src, s);
+	bp.append(src + j, s);
       }
     }
     utime_t end = ceph_clock_now();
@@ -1498,6 +1498,48 @@ TEST(BufferList, BenchAlloc) {
   bench_bufferlist_alloc(4, 100000, 16);
 }
 
+TEST(BufferList, append_bench_with_size_hint) {
+  std::array<char, 1048576> src = { 0, };
+
+  for (size_t step = 4; step <= 16384; step *= 4) {
+    const utime_t start = ceph_clock_now();
+
+    constexpr size_t rounds = 4000;
+    for (size_t r = 0; r < rounds; ++r) {
+      ceph::bufferlist bl(std::size(src));
+      for (auto iter = std::begin(src);
+	   iter != std::end(src);
+	   iter = std::next(iter, step)) {
+	bl.append(&*iter, step);
+      }
+    }
+    cout << rounds << " fills of buffer len " << src.size()
+	 << " with " << step << " byte appends in "
+	 << (ceph_clock_now() - start) << std::endl;
+  }
+}
+
+TEST(BufferList, append_bench) {
+  std::array<char, 1048576> src = { 0, };
+
+  for (size_t step = 4; step <= 16384; step *= 4) {
+    const utime_t start = ceph_clock_now();
+
+    constexpr size_t rounds = 4000;
+    for (size_t r = 0; r < rounds; ++r) {
+      ceph::bufferlist bl;
+      for (auto iter = std::begin(src);
+	   iter != std::end(src);
+	   iter = std::next(iter, step)) {
+	bl.append(&*iter, step);
+      }
+    }
+    cout << rounds << " fills of buffer len " << src.size()
+	 << " with " << step << " byte appends in "
+	 << (ceph_clock_now() - start) << std::endl;
+  }
+}
+
 TEST(BufferList, operator_equal) {
   //
   // list& operator= (const list& other)