-
Notifications
You must be signed in to change notification settings - Fork 6.4k
/
Copy pathperf_context_test.cc
1180 lines (1007 loc) · 38.4 KB
/
perf_context_test.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// 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).
//
#include "rocksdb/perf_context.h"
#include <algorithm>
#include <iostream>
#include <thread>
#include <vector>
#include "monitoring/histogram.h"
#include "monitoring/instrumented_mutex.h"
#include "monitoring/perf_context_imp.h"
#include "monitoring/thread_status_util.h"
#include "port/port.h"
#include "rocksdb/db.h"
#include "rocksdb/memtablerep.h"
#include "rocksdb/slice_transform.h"
#include "rocksdb/system_clock.h"
#include "test_util/testharness.h"
#include "util/stop_watch.h"
#include "util/string_util.h"
#include "utilities/merge_operators.h"
bool FLAGS_random_key = false;
bool FLAGS_use_set_based_memetable = false;
int FLAGS_total_keys = 100;
int FLAGS_write_buffer_size = 1000000000;
int FLAGS_max_write_buffer_number = 8;
int FLAGS_min_write_buffer_number_to_merge = 7;
bool FLAGS_verbose = false;
// Path to the database on file system
const std::string kDbName =
ROCKSDB_NAMESPACE::test::PerThreadDBPath("perf_context_test");
namespace ROCKSDB_NAMESPACE {
std::shared_ptr<DB> OpenDb(bool read_only = false) {
DB* db;
Options options;
options.create_if_missing = true;
options.max_open_files = -1;
options.write_buffer_size = FLAGS_write_buffer_size;
options.max_write_buffer_number = FLAGS_max_write_buffer_number;
options.min_write_buffer_number_to_merge =
FLAGS_min_write_buffer_number_to_merge;
if (FLAGS_use_set_based_memetable) {
options.prefix_extractor.reset(
ROCKSDB_NAMESPACE::NewFixedPrefixTransform(0));
options.memtable_factory.reset(NewHashSkipListRepFactory());
}
Status s;
if (!read_only) {
s = DB::Open(options, kDbName, &db);
} else {
s = DB::OpenForReadOnly(options, kDbName, &db);
}
EXPECT_OK(s);
return std::shared_ptr<DB>(db);
}
class PerfContextTest : public testing::Test {};
TEST_F(PerfContextTest, SeekIntoDeletion) {
ASSERT_OK(DestroyDB(kDbName, Options()));
auto db = OpenDb();
WriteOptions write_options;
ReadOptions read_options;
for (int i = 0; i < FLAGS_total_keys; ++i) {
std::string key = "k" + std::to_string(i);
std::string value = "v" + std::to_string(i);
ASSERT_OK(db->Put(write_options, key, value));
}
for (int i = 0; i < FLAGS_total_keys - 1; ++i) {
std::string key = "k" + std::to_string(i);
ASSERT_OK(db->Delete(write_options, key));
}
HistogramImpl hist_get;
HistogramImpl hist_get_time;
for (int i = 0; i < FLAGS_total_keys - 1; ++i) {
std::string key = "k" + std::to_string(i);
std::string value;
get_perf_context()->Reset();
StopWatchNano timer(SystemClock::Default().get());
timer.Start();
auto status = db->Get(read_options, key, &value);
auto elapsed_nanos = timer.ElapsedNanos();
ASSERT_TRUE(status.IsNotFound());
hist_get.Add(get_perf_context()->user_key_comparison_count);
hist_get_time.Add(elapsed_nanos);
}
if (FLAGS_verbose) {
std::cout << "Get user key comparison: \n"
<< hist_get.ToString() << "Get time: \n"
<< hist_get_time.ToString();
}
{
HistogramImpl hist_seek_to_first;
std::unique_ptr<Iterator> iter(db->NewIterator(read_options));
get_perf_context()->Reset();
StopWatchNano timer(SystemClock::Default().get(), true);
iter->SeekToFirst();
hist_seek_to_first.Add(get_perf_context()->user_key_comparison_count);
auto elapsed_nanos = timer.ElapsedNanos();
if (FLAGS_verbose) {
std::cout << "SeekToFirst user key comparison: \n"
<< hist_seek_to_first.ToString() << "ikey skipped: "
<< get_perf_context()->internal_key_skipped_count << "\n"
<< "idelete skipped: "
<< get_perf_context()->internal_delete_skipped_count << "\n"
<< "elapsed: " << elapsed_nanos << "\n";
}
}
HistogramImpl hist_seek;
for (int i = 0; i < FLAGS_total_keys; ++i) {
std::unique_ptr<Iterator> iter(db->NewIterator(read_options));
std::string key = "k" + std::to_string(i);
get_perf_context()->Reset();
StopWatchNano timer(SystemClock::Default().get(), true);
iter->Seek(key);
auto elapsed_nanos = timer.ElapsedNanos();
hist_seek.Add(get_perf_context()->user_key_comparison_count);
if (FLAGS_verbose) {
std::cout << "seek cmp: " << get_perf_context()->user_key_comparison_count
<< " ikey skipped "
<< get_perf_context()->internal_key_skipped_count
<< " idelete skipped "
<< get_perf_context()->internal_delete_skipped_count
<< " elapsed: " << elapsed_nanos << "ns\n";
}
get_perf_context()->Reset();
ASSERT_TRUE(iter->Valid());
StopWatchNano timer2(SystemClock::Default().get(), true);
iter->Next();
ASSERT_OK(iter->status());
auto elapsed_nanos2 = timer2.ElapsedNanos();
if (FLAGS_verbose) {
std::cout << "next cmp: " << get_perf_context()->user_key_comparison_count
<< "elapsed: " << elapsed_nanos2 << "ns\n";
}
}
if (FLAGS_verbose) {
std::cout << "Seek user key comparison: \n" << hist_seek.ToString();
}
}
TEST_F(PerfContextTest, StopWatchNanoOverhead) {
// profile the timer cost by itself!
const int kTotalIterations = 1000000;
std::vector<uint64_t> timings(kTotalIterations);
StopWatchNano timer(SystemClock::Default().get(), true);
for (auto& timing : timings) {
timing = timer.ElapsedNanos(true /* reset */);
}
HistogramImpl histogram;
for (const auto timing : timings) {
histogram.Add(timing);
}
if (FLAGS_verbose) {
std::cout << histogram.ToString();
}
}
TEST_F(PerfContextTest, StopWatchOverhead) {
// profile the timer cost by itself!
const int kTotalIterations = 1000000;
uint64_t elapsed = 0;
std::vector<uint64_t> timings(kTotalIterations);
StopWatch timer(SystemClock::Default().get(), nullptr, 0,
Histograms::HISTOGRAM_ENUM_MAX, &elapsed);
for (auto& timing : timings) {
timing = elapsed;
}
HistogramImpl histogram;
uint64_t prev_timing = 0;
for (const auto timing : timings) {
histogram.Add(timing - prev_timing);
prev_timing = timing;
}
if (FLAGS_verbose) {
std::cout << histogram.ToString();
}
}
void ProfileQueries(bool enabled_time = false) {
ASSERT_OK(DestroyDB(kDbName, Options())); // Start this test with a fresh DB
auto db = OpenDb();
WriteOptions write_options;
ReadOptions read_options;
HistogramImpl hist_put;
HistogramImpl hist_get;
HistogramImpl hist_get_snapshot;
HistogramImpl hist_get_memtable;
HistogramImpl hist_get_files;
HistogramImpl hist_get_post_process;
HistogramImpl hist_num_memtable_checked;
HistogramImpl hist_mget;
HistogramImpl hist_mget_snapshot;
HistogramImpl hist_mget_memtable;
HistogramImpl hist_mget_files;
HistogramImpl hist_mget_post_process;
HistogramImpl hist_mget_num_memtable_checked;
HistogramImpl hist_write_pre_post;
HistogramImpl hist_write_wal_time;
HistogramImpl hist_write_memtable_time;
HistogramImpl hist_write_delay_time;
HistogramImpl hist_write_thread_wait_nanos;
HistogramImpl hist_write_scheduling_time;
uint64_t total_db_mutex_nanos = 0;
if (FLAGS_verbose) {
std::cout << "Inserting " << FLAGS_total_keys << " key/value pairs\n...\n";
}
std::vector<int> keys;
const int kFlushFlag = -1;
for (int i = 0; i < FLAGS_total_keys; ++i) {
keys.push_back(i);
if (i == FLAGS_total_keys / 2) {
// Issuing a flush in the middle.
keys.push_back(kFlushFlag);
}
}
if (FLAGS_random_key) {
RandomShuffle(std::begin(keys), std::end(keys));
}
#ifndef NDEBUG
ThreadStatusUtil::TEST_SetStateDelay(ThreadStatus::STATE_MUTEX_WAIT, 1U);
#endif
int num_mutex_waited = 0;
for (const int i : keys) {
if (i == kFlushFlag) {
FlushOptions fo;
ASSERT_OK(db->Flush(fo));
continue;
}
std::string key = "k" + std::to_string(i);
std::string value = "v" + std::to_string(i);
std::vector<std::string> values;
get_perf_context()->Reset();
ASSERT_OK(db->Put(write_options, key, value));
if (++num_mutex_waited > 3) {
#ifndef NDEBUG
ThreadStatusUtil::TEST_SetStateDelay(ThreadStatus::STATE_MUTEX_WAIT, 0U);
#endif
}
hist_write_pre_post.Add(
get_perf_context()->write_pre_and_post_process_time);
hist_write_wal_time.Add(get_perf_context()->write_wal_time);
hist_write_memtable_time.Add(get_perf_context()->write_memtable_time);
hist_write_delay_time.Add(get_perf_context()->write_delay_time);
hist_write_thread_wait_nanos.Add(
get_perf_context()->write_thread_wait_nanos);
hist_write_scheduling_time.Add(
get_perf_context()->write_scheduling_flushes_compactions_time);
hist_put.Add(get_perf_context()->user_key_comparison_count);
total_db_mutex_nanos += get_perf_context()->db_mutex_lock_nanos;
}
#ifndef NDEBUG
ThreadStatusUtil::TEST_SetStateDelay(ThreadStatus::STATE_MUTEX_WAIT, 0U);
#endif
for (const int i : keys) {
if (i == kFlushFlag) {
continue;
}
std::string key = "k" + std::to_string(i);
std::string expected_value = "v" + std::to_string(i);
std::string value;
std::vector<Slice> multiget_keys = {Slice(key)};
std::vector<std::string> values;
get_perf_context()->Reset();
ASSERT_OK(db->Get(read_options, key, &value));
ASSERT_EQ(expected_value, value);
hist_get_snapshot.Add(get_perf_context()->get_snapshot_time);
hist_get_memtable.Add(get_perf_context()->get_from_memtable_time);
hist_get_files.Add(get_perf_context()->get_from_output_files_time);
hist_num_memtable_checked.Add(get_perf_context()->get_from_memtable_count);
hist_get_post_process.Add(get_perf_context()->get_post_process_time);
hist_get.Add(get_perf_context()->user_key_comparison_count);
get_perf_context()->Reset();
auto statuses = db->MultiGet(read_options, multiget_keys, &values);
for (const auto& s : statuses) {
ASSERT_OK(s);
}
hist_mget_snapshot.Add(get_perf_context()->get_snapshot_time);
hist_mget_memtable.Add(get_perf_context()->get_from_memtable_time);
hist_mget_files.Add(get_perf_context()->get_from_output_files_time);
hist_mget_num_memtable_checked.Add(
get_perf_context()->get_from_memtable_count);
hist_mget_post_process.Add(get_perf_context()->get_post_process_time);
hist_mget.Add(get_perf_context()->user_key_comparison_count);
}
if (FLAGS_verbose) {
std::cout << "Put user key comparison: \n"
<< hist_put.ToString() << "Get user key comparison: \n"
<< hist_get.ToString() << "MultiGet user key comparison: \n"
<< hist_get.ToString();
std::cout << "Put(): Pre and Post Process Time: \n"
<< hist_write_pre_post.ToString() << " Writing WAL time: \n"
<< hist_write_wal_time.ToString() << "\n"
<< " Writing Mem Table time: \n"
<< hist_write_memtable_time.ToString() << "\n"
<< " Write Delay: \n"
<< hist_write_delay_time.ToString() << "\n"
<< " Waiting for Batch time: \n"
<< hist_write_thread_wait_nanos.ToString() << "\n"
<< " Scheduling Flushes and Compactions Time: \n"
<< hist_write_scheduling_time.ToString() << "\n"
<< " Total DB mutex nanos: \n"
<< total_db_mutex_nanos << "\n";
std::cout << "Get(): Time to get snapshot: \n"
<< hist_get_snapshot.ToString()
<< " Time to get value from memtables: \n"
<< hist_get_memtable.ToString() << "\n"
<< " Time to get value from output files: \n"
<< hist_get_files.ToString() << "\n"
<< " Number of memtables checked: \n"
<< hist_num_memtable_checked.ToString() << "\n"
<< " Time to post process: \n"
<< hist_get_post_process.ToString() << "\n";
std::cout << "MultiGet(): Time to get snapshot: \n"
<< hist_mget_snapshot.ToString()
<< " Time to get value from memtables: \n"
<< hist_mget_memtable.ToString() << "\n"
<< " Time to get value from output files: \n"
<< hist_mget_files.ToString() << "\n"
<< " Number of memtables checked: \n"
<< hist_mget_num_memtable_checked.ToString() << "\n"
<< " Time to post process: \n"
<< hist_mget_post_process.ToString() << "\n";
}
if (enabled_time) {
ASSERT_GT(hist_get.Average(), 0);
ASSERT_GT(hist_get_snapshot.Average(), 0);
ASSERT_GT(hist_get_memtable.Average(), 0);
ASSERT_GT(hist_get_files.Average(), 0);
ASSERT_GT(hist_get_post_process.Average(), 0);
ASSERT_GT(hist_num_memtable_checked.Average(), 0);
ASSERT_GT(hist_mget.Average(), 0);
ASSERT_GT(hist_mget_snapshot.Average(), 0);
ASSERT_GT(hist_mget_memtable.Average(), 0);
ASSERT_GT(hist_mget_files.Average(), 0);
ASSERT_GT(hist_mget_post_process.Average(), 0);
ASSERT_GT(hist_mget_num_memtable_checked.Average(), 0);
EXPECT_GT(hist_write_pre_post.Average(), 0);
EXPECT_GT(hist_write_wal_time.Average(), 0);
EXPECT_GT(hist_write_memtable_time.Average(), 0);
EXPECT_EQ(hist_write_delay_time.Average(), 0);
EXPECT_EQ(hist_write_thread_wait_nanos.Average(), 0);
EXPECT_GT(hist_write_scheduling_time.Average(), 0);
#ifndef NDEBUG
ASSERT_LT(total_db_mutex_nanos, 100U);
#endif
}
db.reset();
db = OpenDb(true);
hist_get.Clear();
hist_get_snapshot.Clear();
hist_get_memtable.Clear();
hist_get_files.Clear();
hist_get_post_process.Clear();
hist_num_memtable_checked.Clear();
hist_mget.Clear();
hist_mget_snapshot.Clear();
hist_mget_memtable.Clear();
hist_mget_files.Clear();
hist_mget_post_process.Clear();
hist_mget_num_memtable_checked.Clear();
for (const int i : keys) {
if (i == kFlushFlag) {
continue;
}
std::string key = "k" + std::to_string(i);
std::string expected_value = "v" + std::to_string(i);
std::string value;
std::vector<Slice> multiget_keys = {Slice(key)};
std::vector<std::string> values;
get_perf_context()->Reset();
ASSERT_OK(db->Get(read_options, key, &value));
ASSERT_EQ(expected_value, value);
hist_get_snapshot.Add(get_perf_context()->get_snapshot_time);
hist_get_memtable.Add(get_perf_context()->get_from_memtable_time);
hist_get_files.Add(get_perf_context()->get_from_output_files_time);
hist_num_memtable_checked.Add(get_perf_context()->get_from_memtable_count);
hist_get_post_process.Add(get_perf_context()->get_post_process_time);
hist_get.Add(get_perf_context()->user_key_comparison_count);
get_perf_context()->Reset();
auto statuses = db->MultiGet(read_options, multiget_keys, &values);
for (const auto& s : statuses) {
ASSERT_OK(s);
}
hist_mget_snapshot.Add(get_perf_context()->get_snapshot_time);
hist_mget_memtable.Add(get_perf_context()->get_from_memtable_time);
hist_mget_files.Add(get_perf_context()->get_from_output_files_time);
hist_mget_num_memtable_checked.Add(
get_perf_context()->get_from_memtable_count);
hist_mget_post_process.Add(get_perf_context()->get_post_process_time);
hist_mget.Add(get_perf_context()->user_key_comparison_count);
}
if (FLAGS_verbose) {
std::cout << "ReadOnly Get user key comparison: \n"
<< hist_get.ToString()
<< "ReadOnly MultiGet user key comparison: \n"
<< hist_mget.ToString();
std::cout << "ReadOnly Get(): Time to get snapshot: \n"
<< hist_get_snapshot.ToString()
<< " Time to get value from memtables: \n"
<< hist_get_memtable.ToString() << "\n"
<< " Time to get value from output files: \n"
<< hist_get_files.ToString() << "\n"
<< " Number of memtables checked: \n"
<< hist_num_memtable_checked.ToString() << "\n"
<< " Time to post process: \n"
<< hist_get_post_process.ToString() << "\n";
std::cout << "ReadOnly MultiGet(): Time to get snapshot: \n"
<< hist_mget_snapshot.ToString()
<< " Time to get value from memtables: \n"
<< hist_mget_memtable.ToString() << "\n"
<< " Time to get value from output files: \n"
<< hist_mget_files.ToString() << "\n"
<< " Number of memtables checked: \n"
<< hist_mget_num_memtable_checked.ToString() << "\n"
<< " Time to post process: \n"
<< hist_mget_post_process.ToString() << "\n";
}
if (enabled_time) {
ASSERT_GT(hist_get.Average(), 0);
ASSERT_GT(hist_get_memtable.Average(), 0);
ASSERT_GT(hist_get_files.Average(), 0);
ASSERT_GT(hist_num_memtable_checked.Average(), 0);
// In read-only mode Get(), no super version operation is needed
ASSERT_EQ(hist_get_post_process.Average(), 0);
ASSERT_GT(hist_get_snapshot.Average(), 0);
ASSERT_GT(hist_mget.Average(), 0);
ASSERT_GT(hist_mget_snapshot.Average(), 0);
ASSERT_GT(hist_mget_memtable.Average(), 0);
ASSERT_GT(hist_mget_files.Average(), 0);
ASSERT_GT(hist_mget_post_process.Average(), 0);
ASSERT_GT(hist_mget_num_memtable_checked.Average(), 0);
}
}
TEST_F(PerfContextTest, KeyComparisonCount) {
SetPerfLevel(kEnableCount);
ProfileQueries();
SetPerfLevel(kDisable);
ProfileQueries();
SetPerfLevel(kEnableTime);
ProfileQueries(true);
}
// make perf_context_test
// export ROCKSDB_TESTS=PerfContextTest.SeekKeyComparison
// For one memtable:
// ./perf_context_test --write_buffer_size=500000 --total_keys=10000
// For two memtables:
// ./perf_context_test --write_buffer_size=250000 --total_keys=10000
// Specify --random_key=1 to shuffle the key before insertion
// Results show that, for sequential insertion, worst-case Seek Key comparison
// is close to the total number of keys (linear), when there is only one
// memtable. When there are two memtables, even the avg Seek Key comparison
// starts to become linear to the input size.
TEST_F(PerfContextTest, SeekKeyComparison) {
ASSERT_OK(DestroyDB(kDbName, Options()));
auto db = OpenDb();
WriteOptions write_options;
ReadOptions read_options;
if (FLAGS_verbose) {
std::cout << "Inserting " << FLAGS_total_keys << " key/value pairs\n...\n";
}
std::vector<int> keys;
for (int i = 0; i < FLAGS_total_keys; ++i) {
keys.push_back(i);
}
if (FLAGS_random_key) {
RandomShuffle(std::begin(keys), std::end(keys));
}
HistogramImpl hist_put_time;
HistogramImpl hist_wal_time;
HistogramImpl hist_time_diff;
SetPerfLevel(kEnableTime);
StopWatchNano timer(SystemClock::Default().get());
for (const int i : keys) {
std::string key = "k" + std::to_string(i);
std::string value = "v" + std::to_string(i);
get_perf_context()->Reset();
timer.Start();
ASSERT_OK(db->Put(write_options, key, value));
auto put_time = timer.ElapsedNanos();
hist_put_time.Add(put_time);
hist_wal_time.Add(get_perf_context()->write_wal_time);
hist_time_diff.Add(put_time - get_perf_context()->write_wal_time);
}
if (FLAGS_verbose) {
std::cout << "Put time:\n"
<< hist_put_time.ToString() << "WAL time:\n"
<< hist_wal_time.ToString() << "time diff:\n"
<< hist_time_diff.ToString();
}
HistogramImpl hist_seek;
HistogramImpl hist_next;
for (int i = 0; i < FLAGS_total_keys; ++i) {
std::string key = "k" + std::to_string(i);
std::string value = "v" + std::to_string(i);
std::unique_ptr<Iterator> iter(db->NewIterator(read_options));
get_perf_context()->Reset();
iter->Seek(key);
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(iter->value().ToString(), value);
hist_seek.Add(get_perf_context()->user_key_comparison_count);
}
std::unique_ptr<Iterator> iter(db->NewIterator(read_options));
for (iter->SeekToFirst(); iter->Valid();) {
get_perf_context()->Reset();
iter->Next();
hist_next.Add(get_perf_context()->user_key_comparison_count);
}
ASSERT_OK(iter->status());
if (FLAGS_verbose) {
std::cout << "Seek:\n"
<< hist_seek.ToString() << "Next:\n"
<< hist_next.ToString();
}
}
TEST_F(PerfContextTest, DBMutexLockCounter) {
int stats_code[] = {0, static_cast<int>(DB_MUTEX_WAIT_MICROS)};
for (PerfLevel perf_level_test :
{PerfLevel::kEnableTimeExceptForMutex, PerfLevel::kEnableTime}) {
for (int c = 0; c < 2; ++c) {
InstrumentedMutex mutex(nullptr, SystemClock::Default().get(),
stats_code[c]);
mutex.Lock();
ROCKSDB_NAMESPACE::port::Thread child_thread([&] {
SetPerfLevel(perf_level_test);
get_perf_context()->Reset();
ASSERT_EQ(get_perf_context()->db_mutex_lock_nanos, 0);
mutex.Lock();
mutex.Unlock();
if (perf_level_test == PerfLevel::kEnableTimeExceptForMutex ||
stats_code[c] != DB_MUTEX_WAIT_MICROS) {
ASSERT_EQ(get_perf_context()->db_mutex_lock_nanos, 0);
} else {
// increment the counter only when it's a DB Mutex
ASSERT_GT(get_perf_context()->db_mutex_lock_nanos, 0);
}
});
SystemClock::Default()->SleepForMicroseconds(100);
mutex.Unlock();
child_thread.join();
}
}
}
TEST_F(PerfContextTest, FalseDBMutexWait) {
SetPerfLevel(kEnableTime);
int stats_code[] = {0, static_cast<int>(DB_MUTEX_WAIT_MICROS)};
for (int c = 0; c < 2; ++c) {
InstrumentedMutex mutex(nullptr, SystemClock::Default().get(),
stats_code[c]);
InstrumentedCondVar lock(&mutex);
get_perf_context()->Reset();
mutex.Lock();
lock.TimedWait(100);
mutex.Unlock();
if (stats_code[c] == static_cast<int>(DB_MUTEX_WAIT_MICROS)) {
// increment the counter only when it's a DB Mutex
ASSERT_GT(get_perf_context()->db_condition_wait_nanos, 0);
} else {
ASSERT_EQ(get_perf_context()->db_condition_wait_nanos, 0);
}
}
}
TEST_F(PerfContextTest, ToString) {
get_perf_context()->Reset();
get_perf_context()->block_read_count = 12345;
std::string zero_included = get_perf_context()->ToString();
ASSERT_NE(std::string::npos, zero_included.find("= 0"));
ASSERT_NE(std::string::npos, zero_included.find("= 12345"));
std::string zero_excluded = get_perf_context()->ToString(true);
ASSERT_EQ(std::string::npos, zero_excluded.find("= 0"));
ASSERT_NE(std::string::npos, zero_excluded.find("= 12345"));
}
TEST_F(PerfContextTest, MergeOperatorTime) {
ASSERT_OK(DestroyDB(kDbName, Options()));
DB* db;
Options options;
options.create_if_missing = true;
options.merge_operator = MergeOperators::CreateStringAppendOperator();
Status s = DB::Open(options, kDbName, &db);
EXPECT_OK(s);
std::string val;
ASSERT_OK(db->Merge(WriteOptions(), "k1", "val1"));
ASSERT_OK(db->Merge(WriteOptions(), "k1", "val2"));
ASSERT_OK(db->Merge(WriteOptions(), "k1", "val3"));
ASSERT_OK(db->Merge(WriteOptions(), "k1", "val4"));
SetPerfLevel(kEnableTime);
get_perf_context()->Reset();
ASSERT_OK(db->Get(ReadOptions(), "k1", &val));
#ifdef OS_SOLARIS
for (int i = 0; i < 100; i++) {
ASSERT_OK(db->Get(ReadOptions(), "k1", &val));
}
#endif
EXPECT_GT(get_perf_context()->merge_operator_time_nanos, 0);
ASSERT_OK(db->Flush(FlushOptions()));
get_perf_context()->Reset();
ASSERT_OK(db->Get(ReadOptions(), "k1", &val));
#ifdef OS_SOLARIS
for (int i = 0; i < 100; i++) {
ASSERT_OK(db->Get(ReadOptions(), "k1", &val));
}
#endif
EXPECT_GT(get_perf_context()->merge_operator_time_nanos, 0);
ASSERT_OK(db->CompactRange(CompactRangeOptions(), nullptr, nullptr));
get_perf_context()->Reset();
ASSERT_OK(db->Get(ReadOptions(), "k1", &val));
#ifdef OS_SOLARIS
for (int i = 0; i < 100; i++) {
ASSERT_OK(db->Get(ReadOptions(), "k1", &val));
}
#endif
EXPECT_GT(get_perf_context()->merge_operator_time_nanos, 0);
delete db;
}
TEST_F(PerfContextTest, CopyAndMove) {
// Assignment operator
{
get_perf_context()->Reset();
get_perf_context()->EnablePerLevelPerfContext();
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_useful, 1, 5);
ASSERT_EQ(
1,
(*(get_perf_context()->level_to_perf_context))[5].bloom_filter_useful);
PerfContext perf_context_assign;
perf_context_assign = *get_perf_context();
ASSERT_EQ(
1,
(*(perf_context_assign.level_to_perf_context))[5].bloom_filter_useful);
get_perf_context()->ClearPerLevelPerfContext();
get_perf_context()->Reset();
ASSERT_EQ(
1,
(*(perf_context_assign.level_to_perf_context))[5].bloom_filter_useful);
perf_context_assign.ClearPerLevelPerfContext();
perf_context_assign.Reset();
}
// Copy constructor
{
get_perf_context()->Reset();
get_perf_context()->EnablePerLevelPerfContext();
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_useful, 1, 5);
ASSERT_EQ(
1,
(*(get_perf_context()->level_to_perf_context))[5].bloom_filter_useful);
PerfContext perf_context_copy(*get_perf_context());
ASSERT_EQ(
1, (*(perf_context_copy.level_to_perf_context))[5].bloom_filter_useful);
get_perf_context()->ClearPerLevelPerfContext();
get_perf_context()->Reset();
ASSERT_EQ(
1, (*(perf_context_copy.level_to_perf_context))[5].bloom_filter_useful);
perf_context_copy.ClearPerLevelPerfContext();
perf_context_copy.Reset();
}
// Move constructor
{
get_perf_context()->Reset();
get_perf_context()->EnablePerLevelPerfContext();
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_useful, 1, 5);
ASSERT_EQ(
1,
(*(get_perf_context()->level_to_perf_context))[5].bloom_filter_useful);
PerfContext perf_context_move = std::move(*get_perf_context());
ASSERT_EQ(
1, (*(perf_context_move.level_to_perf_context))[5].bloom_filter_useful);
get_perf_context()->ClearPerLevelPerfContext();
get_perf_context()->Reset();
ASSERT_EQ(
1, (*(perf_context_move.level_to_perf_context))[5].bloom_filter_useful);
perf_context_move.ClearPerLevelPerfContext();
perf_context_move.Reset();
}
}
TEST_F(PerfContextTest, PerfContextDisableEnable) {
get_perf_context()->Reset();
get_perf_context()->EnablePerLevelPerfContext();
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_full_positive, 1, 0);
get_perf_context()->DisablePerLevelPerfContext();
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_useful, 1, 5);
get_perf_context()->EnablePerLevelPerfContext();
PERF_COUNTER_BY_LEVEL_ADD(block_cache_hit_count, 1, 0);
get_perf_context()->DisablePerLevelPerfContext();
PerfContext perf_context_copy(*get_perf_context());
ASSERT_EQ(1, (*(perf_context_copy.level_to_perf_context))[0]
.bloom_filter_full_positive);
// this was set when per level perf context is disabled, should not be copied
ASSERT_NE(
1, (*(perf_context_copy.level_to_perf_context))[5].bloom_filter_useful);
ASSERT_EQ(
1, (*(perf_context_copy.level_to_perf_context))[0].block_cache_hit_count);
perf_context_copy.ClearPerLevelPerfContext();
perf_context_copy.Reset();
get_perf_context()->ClearPerLevelPerfContext();
get_perf_context()->Reset();
}
TEST_F(PerfContextTest, PerfContextByLevelGetSet) {
get_perf_context()->Reset();
get_perf_context()->EnablePerLevelPerfContext();
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_full_positive, 1, 0);
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_useful, 1, 5);
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_useful, 1, 7);
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_useful, 1, 7);
PERF_COUNTER_BY_LEVEL_ADD(bloom_filter_full_true_positive, 1, 2);
PERF_COUNTER_BY_LEVEL_ADD(block_cache_hit_count, 1, 0);
PERF_COUNTER_BY_LEVEL_ADD(block_cache_hit_count, 5, 2);
PERF_COUNTER_BY_LEVEL_ADD(block_cache_miss_count, 2, 3);
PERF_COUNTER_BY_LEVEL_ADD(block_cache_miss_count, 4, 1);
ASSERT_EQ(
0, (*(get_perf_context()->level_to_perf_context))[0].bloom_filter_useful);
ASSERT_EQ(
1, (*(get_perf_context()->level_to_perf_context))[5].bloom_filter_useful);
ASSERT_EQ(
2, (*(get_perf_context()->level_to_perf_context))[7].bloom_filter_useful);
ASSERT_EQ(1, (*(get_perf_context()->level_to_perf_context))[0]
.bloom_filter_full_positive);
ASSERT_EQ(1, (*(get_perf_context()->level_to_perf_context))[2]
.bloom_filter_full_true_positive);
ASSERT_EQ(
1,
(*(get_perf_context()->level_to_perf_context))[0].block_cache_hit_count);
ASSERT_EQ(
5,
(*(get_perf_context()->level_to_perf_context))[2].block_cache_hit_count);
ASSERT_EQ(
2,
(*(get_perf_context()->level_to_perf_context))[3].block_cache_miss_count);
ASSERT_EQ(
4,
(*(get_perf_context()->level_to_perf_context))[1].block_cache_miss_count);
std::string zero_excluded = get_perf_context()->ToString(true);
ASSERT_NE(std::string::npos,
zero_excluded.find("bloom_filter_useful = 1@level5, 2@level7"));
ASSERT_NE(std::string::npos,
zero_excluded.find("bloom_filter_full_positive = 1@level0"));
ASSERT_NE(std::string::npos,
zero_excluded.find("bloom_filter_full_true_positive = 1@level2"));
ASSERT_NE(std::string::npos,
zero_excluded.find("block_cache_hit_count = 1@level0, 5@level2"));
ASSERT_NE(std::string::npos,
zero_excluded.find("block_cache_miss_count = 4@level1, 2@level3"));
}
TEST_F(PerfContextTest, CPUTimer) {
if (SystemClock::Default()->CPUNanos() == 0) {
ROCKSDB_GTEST_SKIP("Target without CPUNanos support");
return;
}
ASSERT_OK(DestroyDB(kDbName, Options()));
auto db = OpenDb();
WriteOptions write_options;
ReadOptions read_options;
SetPerfLevel(PerfLevel::kEnableTimeAndCPUTimeExceptForMutex);
std::string max_str = "0";
for (int i = 0; i < FLAGS_total_keys; ++i) {
std::string i_str = std::to_string(i);
std::string key = "k" + i_str;
std::string value = "v" + i_str;
max_str = max_str > i_str ? max_str : i_str;
ASSERT_OK(db->Put(write_options, key, value));
}
std::string last_key = "k" + max_str;
std::string last_value = "v" + max_str;
{
// Get
get_perf_context()->Reset();
std::string value;
ASSERT_OK(db->Get(read_options, "k0", &value));
ASSERT_EQ(value, "v0");
if (FLAGS_verbose) {
std::cout << "Get CPU time nanos: " << get_perf_context()->get_cpu_nanos
<< "ns\n";
}
// Iter
std::unique_ptr<Iterator> iter(db->NewIterator(read_options));
// Seek
get_perf_context()->Reset();
iter->Seek(last_key);
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(last_value, iter->value().ToString());
if (FLAGS_verbose) {
std::cout << "Iter Seek CPU time nanos: "
<< get_perf_context()->iter_seek_cpu_nanos << "ns\n";
}
// SeekForPrev
get_perf_context()->Reset();
iter->SeekForPrev(last_key);
ASSERT_TRUE(iter->Valid());
if (FLAGS_verbose) {
std::cout << "Iter SeekForPrev CPU time nanos: "
<< get_perf_context()->iter_seek_cpu_nanos << "ns\n";
}
// SeekToLast
get_perf_context()->Reset();
iter->SeekToLast();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ(last_value, iter->value().ToString());
if (FLAGS_verbose) {
std::cout << "Iter SeekToLast CPU time nanos: "
<< get_perf_context()->iter_seek_cpu_nanos << "ns\n";
}
// SeekToFirst
get_perf_context()->Reset();
iter->SeekToFirst();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("v0", iter->value().ToString());
if (FLAGS_verbose) {
std::cout << "Iter SeekToFirst CPU time nanos: "
<< get_perf_context()->iter_seek_cpu_nanos << "ns\n";
}
// Next
get_perf_context()->Reset();
iter->Next();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("v1", iter->value().ToString());
if (FLAGS_verbose) {
std::cout << "Iter Next CPU time nanos: "
<< get_perf_context()->iter_next_cpu_nanos << "ns\n";
}
// Prev
get_perf_context()->Reset();
iter->Prev();
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("v0", iter->value().ToString());
if (FLAGS_verbose) {
std::cout << "Iter Prev CPU time nanos: "
<< get_perf_context()->iter_prev_cpu_nanos << "ns\n";
}
// monotonically increasing
get_perf_context()->Reset();
uint64_t count = get_perf_context()->iter_seek_cpu_nanos;
uint64_t before_count = count;
for (int i = 0; i < FLAGS_total_keys; ++i) {
iter->Seek("k" + std::to_string(i));
ASSERT_TRUE(iter->Valid());
ASSERT_EQ("v" + std::to_string(i), iter->value().ToString());
auto next_count = get_perf_context()->iter_seek_cpu_nanos;
ASSERT_GE(next_count, count);
count = next_count;
}
ASSERT_GT(count, before_count);
// iterator creation/destruction; multiple iterators
{
std::unique_ptr<Iterator> iter2(db->NewIterator(read_options));
ASSERT_EQ(count, get_perf_context()->iter_seek_cpu_nanos);
iter2->Seek(last_key);
ASSERT_TRUE(iter2->Valid());
ASSERT_EQ(last_value, iter2->value().ToString());
ASSERT_GT(get_perf_context()->iter_seek_cpu_nanos, count);
count = get_perf_context()->iter_seek_cpu_nanos;
}
ASSERT_EQ(count, get_perf_context()->iter_seek_cpu_nanos);
}
}
TEST_F(PerfContextTest, MergeOperandCount) {
ASSERT_OK(DestroyDB(kDbName, Options()));
DB* db = nullptr;
Options options;
options.create_if_missing = true;
options.merge_operator = MergeOperators::CreateStringAppendOperator();
ASSERT_OK(DB::Open(options, kDbName, &db));
std::unique_ptr<DB> db_guard(db);
constexpr size_t num_keys = 3;
const std::string key_prefix("key");
const std::string value_prefix("value");
std::vector<std::string> keys;
keys.reserve(num_keys);
for (size_t i = 0; i < num_keys; ++i) {
keys.emplace_back(key_prefix + std::to_string(i));
}
// Write three keys with one Put each followed by 1, 2, and 3
// Merge operations respectively.
constexpr size_t total_merges = num_keys * (num_keys + 1) / 2;
std::vector<ManagedSnapshot> snapshots;
snapshots.reserve(total_merges);