| // Copyright 2018 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <fbl/string_printf.h> |
| #include <perftest/perftest.h> |
| #include <zircon/assert.h> |
| #include <zircon/syscalls.h> |
| |
| namespace { |
| |
| // Test sleeping for different lengths of time. |
| // |
| // This serves an example of a parameterized perf test. |
| // |
| // This can be useful for measuring the overhead of sleeping. It can also |
| // be used to measure the variation in actual sleep times. Checking for |
| // under-sleeps and over-sleeps can serve as a sanity check for the |
| // perftest framework. |
| // |
| // Ideally we would be able to test a continuous range of sleep times, |
| // which might reveal discontinuities in the actual sleep times. The |
| // perftest framework does not support this yet. |
| bool SleepTest(perftest::RepeatState* state, zx_duration_t delay_ns) { |
| while (state->KeepRunning()) { |
| ZX_ASSERT(zx_nanosleep(zx_deadline_after(delay_ns)) == ZX_OK); |
| } |
| return true; |
| } |
| |
| void RegisterTests() { |
| static const zx_duration_t kTimesNs[] = { |
| 0, 1, 10, 100, 1000, 10000, |
| }; |
| for (auto time_ns : kTimesNs) { |
| auto name = fbl::StringPrintf("Sleep/%lluns", static_cast<unsigned long long>(time_ns)); |
| perftest::RegisterTest(name.c_str(), SleepTest, time_ns); |
| } |
| } |
| PERFTEST_CTOR(RegisterTests) |
| |
| } // namespace |
