-
Notifications
You must be signed in to change notification settings - Fork 184
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Submillisecond temporal disambiguation of random labels.
- Loading branch information
1 parent
faa42b9
commit c15e17a
Showing
5 changed files
with
240 additions
and
27 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
138 changes: 138 additions & 0 deletions
138
tiledb/common/random/test/unit_random_label_generator.cc
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 +1,138 @@ | ||
| /** | ||
| * @file tiledb/common/random/test/unit_random_label_generator.cc | ||
| * | ||
| * @section LICENSE | ||
| * | ||
| * The MIT License | ||
| * | ||
| * @copyright Copyright (c) 2024 TileDB, Inc. | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to deal | ||
| * in the Software without restriction, including without limitation the rights | ||
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| * copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| * THE SOFTWARE. | ||
| * | ||
| * Tests for the random label generator. | ||
| */ | ||
|
|
||
| #include <test/support/tdb_catch.h> | ||
| #include "../random_label.h" | ||
|
|
||
| using namespace tiledb::common; | ||
| using namespace tiledb::sm; | ||
|
|
||
| size_t generate_labels(std::vector<std::string>& labels) { | ||
| size_t labels_size = labels.size(); | ||
| auto now = utils::time::timestamp_now_ms(); | ||
| size_t idx = 0; | ||
| while ((utils::time::timestamp_now_ms()) < now + 100 && idx < labels_size) { | ||
| labels[idx++] = random_label(); | ||
| } | ||
|
|
||
| return idx; | ||
| } | ||
|
|
||
| void validate_labels(std::vector<std::string>& labels, size_t num_labels) { | ||
| // Given the label randomness and the fact that we're racing the processor, | ||
| // the best we can do here (for now) is assert that there's 10 ordered groups. | ||
| // In this manner, groups are defined as sharing the first 4 bytes. | ||
| uint64_t num_groups = 0; | ||
| uint64_t this_group = 0; | ||
| for (size_t i = 1; i < num_labels; i++) { | ||
| bool match = true; | ||
| for (size_t j = 0; j < 4; j++) { | ||
| if (labels[i - 1][j] != labels[i][j]) { | ||
| match = false; | ||
| break; | ||
| } | ||
| } | ||
| if (!match) { | ||
| if (this_group > 10) { | ||
| num_groups += 1; | ||
| } | ||
| this_group = 0; | ||
| continue; | ||
| } | ||
|
|
||
| // We share a prefix so assert that they're ordered. | ||
| REQUIRE(labels[i] > labels[i - 1]); | ||
| this_group += 1; | ||
| } | ||
|
|
||
| REQUIRE(num_groups > 10); | ||
| } | ||
|
|
||
| TEST_CASE( | ||
| "RandomLabelGenerator: serial generation", | ||
| "[RandomLabelGenerator][serial]") { | ||
| // Generate a random label to validate initialization. | ||
| auto label = random_label(); | ||
| REQUIRE(label.size() == 32); | ||
|
|
||
| // Test one million strings. Let's assume the buffer overflow check works. | ||
| std::vector<std::string> labels{1000000}; | ||
| auto num_labels = generate_labels(labels); | ||
| validate_labels(labels, num_labels); | ||
| } | ||
|
|
||
| TEST_CASE( | ||
| "RandomLabelGenerator: parallel generation", | ||
| "[RandomLabelGenerator][parallel]") { | ||
| const unsigned nthreads = 20; | ||
| std::vector<std::thread> threads; | ||
| std::vector<std::vector<std::string>> labels{nthreads}; | ||
| size_t num_labels[nthreads]; | ||
|
|
||
| // Pre-allocate our buffers so we're getting as much contention as possible | ||
| for (size_t i = 0; i < nthreads; i++) { | ||
| labels[i].resize(1000000); | ||
| } | ||
|
|
||
| // Generate labels simultaneously in multiple threads. | ||
| for (size_t i = 0; i < nthreads; i++) { | ||
| auto num_ptr = &num_labels[i]; | ||
| auto vec_ptr = &labels[i]; | ||
| threads.emplace_back([num_ptr, vec_ptr]() { | ||
| auto num = generate_labels(*vec_ptr); | ||
| *num_ptr = num; | ||
| }); | ||
| } | ||
|
|
||
| // Wait for all of our threads to finish. | ||
| for (auto& t : threads) { | ||
| t.join(); | ||
| } | ||
|
|
||
| // Check that we've generated the correct number of random labels. | ||
| std::unordered_set<std::string> label_set; | ||
| size_t total_labels = 0; | ||
| for (size_t i = 0; i < nthreads; i++) { | ||
| total_labels += num_labels[i]; | ||
| for (size_t j = 0; j < num_labels[i]; j++) { | ||
| label_set.insert(labels[i][j]); | ||
| } | ||
| } | ||
| REQUIRE(label_set.size() == total_labels); | ||
|
|
||
| // Sort and validate the parallel threads as if they were serially generated. | ||
| std::vector<std::string> all_labels{total_labels}; | ||
| size_t idx = 0; | ||
| for (auto label : label_set) { | ||
| all_labels[idx++] = label; | ||
| } | ||
| std::sort(all_labels.begin(), all_labels.end()); | ||
| validate_labels(all_labels, total_labels); | ||
| } |