forked from facebook/rocksdb
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Add useful idioms to Random API (OneInOpt, PercentTrue) (facebook#6154)
Summary: And clean up related code, especially in stress test. (More clean up of db_stress_test_base.cc coming after this.) Pull Request resolved: facebook#6154 Test Plan: make check, make blackbox_crash_test for a bit Differential Revision: D18938180 Pulled By: pdillinger fbshipit-source-id: 524d27621b8dbb25f6dff40f1081e7c00630357e
- Loading branch information
1 parent
6d54eb3
commit 58d46d1
Showing
9 changed files
with
159 additions
and
35 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| // Copyright (c) 2011-present, Facebook, Inc. All rights reserved. | ||
| // This source code is licensed under both the GPLv2 (found in the | ||
| // COPYING file in the root directory) and Apache 2.0 License | ||
| // (found in the LICENSE.Apache file in the root directory). | ||
| // | ||
| // Copyright (c) 2012 The LevelDB Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. See the AUTHORS file for names of contributors. | ||
|
|
||
| #include <cstring> | ||
| #include <vector> | ||
|
|
||
| #include "test_util/testharness.h" | ||
| #include "util/random.h" | ||
|
|
||
| using rocksdb::Random; | ||
|
|
||
| TEST(RandomTest, Uniform) { | ||
| const int average = 20; | ||
| for (uint32_t seed : {0, 1, 2, 37, 4096}) { | ||
| Random r(seed); | ||
| for (int range : {1, 2, 8, 12, 100}) { | ||
| std::vector<int> counts(range, 0); | ||
|
|
||
| for (int i = 0; i < range * average; ++i) { | ||
| ++counts.at(r.Uniform(range)); | ||
| } | ||
| int max_variance = static_cast<int>(std::sqrt(range) * 2 + 4); | ||
| for (int i = 0; i < range; ++i) { | ||
| EXPECT_GE(counts[i], std::max(1, average - max_variance)); | ||
| EXPECT_LE(counts[i], average + max_variance + 1); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| TEST(RandomTest, OneIn) { | ||
| Random r(42); | ||
| for (int range : {1, 2, 8, 12, 100, 1234}) { | ||
| const int average = 100; | ||
| int count = 0; | ||
| for (int i = 0; i < average * range; ++i) { | ||
| if (r.OneIn(range)) { | ||
| ++count; | ||
| } | ||
| } | ||
| if (range == 1) { | ||
| EXPECT_EQ(count, average); | ||
| } else { | ||
| int max_variance = static_cast<int>(std::sqrt(average) * 1.5); | ||
| EXPECT_GE(count, average - max_variance); | ||
| EXPECT_LE(count, average + max_variance); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| TEST(RandomTest, OneInOpt) { | ||
| Random r(42); | ||
| for (int range : {-12, 0, 1, 2, 8, 12, 100, 1234}) { | ||
| const int average = 100; | ||
| int count = 0; | ||
| for (int i = 0; i < average * range; ++i) { | ||
| if (r.OneInOpt(range)) { | ||
| ++count; | ||
| } | ||
| } | ||
| if (range < 1) { | ||
| EXPECT_EQ(count, 0); | ||
| } else if (range == 1) { | ||
| EXPECT_EQ(count, average); | ||
| } else { | ||
| int max_variance = static_cast<int>(std::sqrt(average) * 1.5); | ||
| EXPECT_GE(count, average - max_variance); | ||
| EXPECT_LE(count, average + max_variance); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| TEST(RandomTest, PercentTrue) { | ||
| Random r(42); | ||
| for (int pct : {-12, 0, 1, 2, 10, 50, 90, 98, 99, 100, 1234}) { | ||
| const int samples = 10000; | ||
|
|
||
| int count = 0; | ||
| for (int i = 0; i < samples; ++i) { | ||
| if (r.PercentTrue(pct)) { | ||
| ++count; | ||
| } | ||
| } | ||
| if (pct <= 0) { | ||
| EXPECT_EQ(count, 0); | ||
| } else if (pct >= 100) { | ||
| EXPECT_EQ(count, samples); | ||
| } else { | ||
| int est = (count * 100 + (samples / 2)) / samples; | ||
| EXPECT_EQ(est, pct); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| int main(int argc, char** argv) { | ||
| ::testing::InitGoogleTest(&argc, argv); | ||
|
|
||
| return RUN_ALL_TESTS(); | ||
| } |