license.bot | f003cfe | 2008-08-24 09:55:55 +0900 | [diff] [blame^] | 1 | // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 4 | |
| 5 | #ifndef BASE_PERFTTIMER_H__ |
| 6 | #define BASE_PERFTTIMER_H__ |
| 7 | |
| 8 | #include <string> |
| 9 | #include "base/basictypes.h" |
| 10 | #include "base/time.h" |
| 11 | |
| 12 | // ---------------------------------------------------------------------- |
| 13 | // Initializes and finalizes the perf log. These functions should be |
| 14 | // called at the beginning and end (respectively) of running all the |
| 15 | // performance tests. The init function returns true on success. |
| 16 | // ---------------------------------------------------------------------- |
| 17 | bool InitPerfLog(const char* log_file); |
| 18 | void FinalizePerfLog(); |
| 19 | |
| 20 | // ---------------------------------------------------------------------- |
| 21 | // LogPerfResult |
| 22 | // Writes to the perf result log the given 'value' resulting from the |
| 23 | // named 'test'. The units are to aid in reading the log by people. |
| 24 | // ---------------------------------------------------------------------- |
| 25 | void LogPerfResult(const char* test_name, double value, const char* units); |
| 26 | |
| 27 | // ---------------------------------------------------------------------- |
| 28 | // PerfTimer |
| 29 | // A simple wrapper around Now() |
| 30 | // ---------------------------------------------------------------------- |
| 31 | class PerfTimer { |
| 32 | public: |
| 33 | PerfTimer() { |
| 34 | begin_ = TimeTicks::Now(); |
| 35 | } |
| 36 | |
| 37 | // Returns the time elapsed since object construction |
| 38 | TimeDelta Elapsed() const { |
| 39 | return TimeTicks::Now() - begin_; |
| 40 | } |
| 41 | |
| 42 | private: |
| 43 | TimeTicks begin_; |
| 44 | }; |
| 45 | |
| 46 | // ---------------------------------------------------------------------- |
| 47 | // PerfTimeLogger |
| 48 | // Automates calling LogPerfResult for the common case where you want |
| 49 | // to measure the time that something took. Call Done() when the test |
| 50 | // is complete if you do extra work after the test or there are stack |
| 51 | // objects with potentially expensive constructors. Otherwise, this |
| 52 | // class with automatically log on destruction. |
| 53 | // ---------------------------------------------------------------------- |
| 54 | class PerfTimeLogger { |
| 55 | public: |
| 56 | explicit PerfTimeLogger(const char* test_name) |
| 57 | : logged_(false), |
| 58 | test_name_(test_name) { |
| 59 | } |
| 60 | |
| 61 | ~PerfTimeLogger() { |
| 62 | if (!logged_) |
| 63 | Done(); |
| 64 | } |
| 65 | |
| 66 | void Done() { |
| 67 | // we use a floating-point millisecond value because it is more |
| 68 | // intuitive than microseconds and we want more precision than |
| 69 | // integer milliseconds |
| 70 | LogPerfResult(test_name_.c_str(), timer_.Elapsed().InMillisecondsF(), "ms"); |
| 71 | logged_ = true; |
| 72 | } |
| 73 | |
| 74 | private: |
| 75 | bool logged_; |
| 76 | std::string test_name_; |
| 77 | PerfTimer timer_; |
| 78 | }; |
| 79 | |
| 80 | #endif // BASE_PERFTTIMER_H__ |
license.bot | f003cfe | 2008-08-24 09:55:55 +0900 | [diff] [blame^] | 81 | |