1 files changed, 77 insertions, 0 deletions
diff --git a/src/seastar/tests/perf/future_util_perf.cc b/src/seastar/tests/perf/future_util_perf.cc
new file mode 100644
index 000000000..a439628ad
--- /dev/null
+++ b/src/seastar/tests/perf/future_util_perf.cc
@@ -0,0 +1,77 @@
+/*
+ * This file is open source software, licensed to you under the terms
+ * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
+ * distributed with this work for additional information regarding copyright
+ * ownership.  You may not use this file except in compliance with the License.
+ *
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+ * Copyright (C) 2018 ScyllaDB Ltd.
+ */
+
+#include <boost/range.hpp>
+#include <boost/range/irange.hpp>
+
+#include <seastar/testing/perf_tests.hh>
+#include <seastar/core/loop.hh>
+#include <seastar/util/later.hh>
+
+struct parallel_for_each {
+    std::vector<int> empty_range;
+    std::vector<int> range;
+    int value;
+
+    parallel_for_each()
+        : empty_range()
+        , range(boost::copy_range<std::vector<int>>(boost::irange(1, 100)))
+    { }
+};
+
+PERF_TEST_F(parallel_for_each, empty)
+{
+    return seastar::parallel_for_each(empty_range, [] (int) -> future<> {
+        abort();
+    });
+}
+
+[[gnu::noinline]]
+future<> immediate(int v, int& vs)
+{
+    vs += v;
+    return make_ready_future<>();
+}
+
+PERF_TEST_F(parallel_for_each, immediate)
+{
+    return seastar::parallel_for_each(range, [this] (int v) {
+        return immediate(v, value);
+    }).then([this] {
+        perf_tests::do_not_optimize(value);
+    });
+}
+
+[[gnu::noinline]]
+future<> suspend(int v, int& vs)
+{
+    vs += v;
+    return later();
+}
+
+PERF_TEST_F(parallel_for_each, suspend)
+{
+    return seastar::parallel_for_each(range, [this] (int v) {
+        return suspend(v, value);
+    }).then([this] {
+        perf_tests::do_not_optimize(value);
+    });
+}