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https://issues.apache.org/jira/browse/IGNITE-23316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17898569#comment-17898569
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Vladislav Pyatkov commented on IGNITE-23316:
--------------------------------------------
Benchmark (clockOptimisationEnable) (clusterSize) (fsync)
Mode Cnt Score Error Units
SelectBenchmark.kvGet16 false 1 false
thrpt 20 342720.705 ± 28020.727 ops/s
SelectBenchmark.kvGet16 true 1 false
thrpt 20 355052.054 ± 36981.952 ops/s
SelectBenchmark.kvGet2 false 1 false
thrpt 20 115337.877 ± 21416.119 ops/s
SelectBenchmark.kvGet2 true 1 false
thrpt 20 209501.631 ± 11199.247 ops/s
SelectBenchmark.kvGet32 false 1 false
thrpt 20 371942.472 ± 33987.155 ops/s
SelectBenchmark.kvGet32 true 1 false
thrpt 20 446417.599 ± 44151.695 ops/s
SelectBenchmark.kvGet8 false 1 false
thrpt 20 247639.011 ± 22236.092 ops/s
SelectBenchmark.kvGet8 true 1 false
thrpt 20 278507.407 ± 31575.227 ops/s
SelectBenchmark.kvThinGet16 false 1 false
thrpt 20 28274.544 ± 2899.646 ops/s
SelectBenchmark.kvThinGet16 true 1 false
thrpt 20 28349.755 ± 1359.339 ops/s
SelectBenchmark.kvThinGet2 false 1 false
thrpt 20 2462.185 ± 214.741 ops/s
SelectBenchmark.kvThinGet2 true 1 false
thrpt 20 2410.425 ± 132.871 ops/s
SelectBenchmark.kvThinGet32 false 1 false
thrpt 20 39411.906 ± 1484.513 ops/s
SelectBenchmark.kvThinGet32 true 1 false
thrpt 20 43292.651 ± 2848.292 ops/s
SelectBenchmark.kvThinGet8 false 1 false
thrpt 20 17177.921 ± 649.470 ops/s
SelectBenchmark.kvThinGet8 true 1 false
thrpt 20 14915.538 ± 991.048 ops/s
> Hybrid Clock#update can be optimized in case where return value is not needed
> -----------------------------------------------------------------------------
>
> Key: IGNITE-23316
> URL: https://issues.apache.org/jira/browse/IGNITE-23316
> Project: Ignite
> Issue Type: Improvement
> Reporter: Vladislav Pyatkov
> Assignee: Vladislav Pyatkov
> Priority: Major
> Labels: ignite-3
> Time Spent: 10m
> Remaining Estimate: 0h
>
> h3. Motivation
> Thread-safe update is an expensive operation, and we ought to avoid it in
> cases where it is not needed. The stack below shows the usage update
> operation where the result value in not used:
> {code}
> if (response instanceof TimestampAware) {
> clock.update(((TimestampAware) response).timestamp());
> }
> {code}
> {noformat}
> hybridClock:update-:java.lang.Exception:
> at
> org.apache.ignite.internal.util.IgniteUtils.dumpStack(IgniteUtils.java:682)
> at
> org.apache.ignite.internal.hlc.HybridClockImpl.update(HybridClockImpl.java:119)
> at
> org.apache.ignite.internal.replicator.ReplicaService.lambda$sendToReplica$7(ReplicaService.java:164)
> at
> java.base/java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:859)
> at
> java.base/java.util.concurrent.CompletableFuture.uniWhenCompleteStage(CompletableFuture.java:883)
> at
> java.base/java.util.concurrent.CompletableFuture.whenComplete(CompletableFuture.java:2257)
> at
> org.apache.ignite.internal.replicator.ReplicaService.sendToReplica(ReplicaService.java:144)
> at
> org.apache.ignite.internal.replicator.ReplicaService.invoke(ReplicaService.java:275)
> at
> org.apache.ignite.internal.table.distributed.storage.InternalTableImpl.lambda$evaluateReadOnlyPrimaryNode$19(InternalTableImpl.java:772)
> at
> java.base/java.util.concurrent.CompletableFuture.uniComposeStage(CompletableFuture.java:1106)
> at
> java.base/java.util.concurrent.CompletableFuture.thenCompose(CompletableFuture.java:2241)
> at
> org.apache.ignite.internal.table.distributed.storage.InternalTableImpl.evaluateReadOnlyPrimaryNode(InternalTableImpl.java:763)
> at
> org.apache.ignite.internal.table.distributed.storage.InternalTableImpl.get(InternalTableImpl.java:859)
> at
> org.apache.ignite.internal.table.KeyValueBinaryViewImpl.lambda$getAsync$1(KeyValueBinaryViewImpl.java:120)
> at
> org.apache.ignite.internal.table.AbstractTableView.lambda$withSchemaSync$2(AbstractTableView.java:143)
> at
> java.base/java.util.concurrent.CompletableFuture.uniComposeStage(CompletableFuture.java:1106)
> at
> java.base/java.util.concurrent.CompletableFuture.thenCompose(CompletableFuture.java:2241)
> at
> org.apache.ignite.internal.table.AbstractTableView.withSchemaSync(AbstractTableView.java:143)
> at
> org.apache.ignite.internal.table.AbstractTableView.withSchemaSync(AbstractTableView.java:134)
> at
> org.apache.ignite.internal.table.AbstractTableView.doOperation(AbstractTableView.java:112)
> at
> org.apache.ignite.internal.table.KeyValueBinaryViewImpl.getAsync(KeyValueBinaryViewImpl.java:117)
> at
> org.apache.ignite.internal.table.KeyValueBinaryViewImpl.get(KeyValueBinaryViewImpl.java:104)
> at
> org.apache.ignite.internal.table.KeyValueBinaryViewImpl.get(KeyValueBinaryViewImpl.java:74)
> at
> org.apache.ignite.internal.table.PublicApiThreadingKeyValueView.lambda$get$0(PublicApiThreadingKeyValueView.java:57)
> at
> org.apache.ignite.internal.thread.PublicApiThreading.executeWithRole(PublicApiThreading.java:144)
> at
> org.apache.ignite.internal.thread.PublicApiThreading.execUserSyncOperation(PublicApiThreading.java:102)
> at
> org.apache.ignite.internal.table.PublicApiThreadingViewBase.executeSyncOp(PublicApiThreadingViewBase.java:107)
> at
> org.apache.ignite.internal.table.PublicApiThreadingKeyValueView.get(PublicApiThreadingKeyValueView.java:57)
> at
> org.apache.ignite.internal.restart.RestartProofKeyValueView.lambda$get$0(RestartProofKeyValueView.java:58)
> at
> org.apache.ignite.internal.restart.RestartProofApiObject.lambda$attached$0(RestartProofApiObject.java:46)
> at
> org.apache.ignite.internal.restart.IgniteAttachmentLock.attached(IgniteAttachmentLock.java:59)
> at
> org.apache.ignite.internal.restart.RestartProofApiObject.attached(RestartProofApiObject.java:46)
> at
> org.apache.ignite.internal.restart.RestartProofKeyValueView.get(RestartProofKeyValueView.java:58)
> at
> org.apache.ignite.internal.benchmark.SelectBenchmark.kvGet(SelectBenchmark.java:175)
> at
> org.apache.ignite.internal.benchmark.jmh_generated.SelectBenchmark_kvGet_jmhTest.kvGet_avgt_jmhStub(SelectBenchmark_kvGet_jmhTest.java:238)
> at
> org.apache.ignite.internal.benchmark.jmh_generated.SelectBenchmark_kvGet_jmhTest.kvGet_AverageTime(SelectBenchmark_kvGet_jmhTest.java:177)
> at jdk.internal.reflect.GeneratedMethodAccessor17.invoke(Unknown Source)
> at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:566)
> at
> org.openjdk.jmh.runner.BenchmarkHandler$BenchmarkTask.call(BenchmarkHandler.java:527)
> at
> org.openjdk.jmh.runner.BenchmarkHandler$BenchmarkTask.call(BenchmarkHandler.java:504)
> at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> at
> java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
> at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> at java.base/java.lang.Thread.run(Thread.java:829)
> {noformat}
> h3. Implementation notes
> My proposal of the fast update operation:
> {code}
> public void fastUpdate(HybridTimestamp requestTime) {
> long requestTimeLong = requestTime.longValue();
> while (true) {
> long now = currentTime();
> if (requestTimeLong <= now) {
> return;
> }
> // Read the latest time after accessing UTC time to reduce
> contention.
> long oldLatestTime = this.latestTime;
> if (requestTimeLong <= oldLatestTime) {
> return;
> }
> if (LATEST_TIME.compareAndSet(this, oldLatestTime,
> requestTimeLong)) {
> notifyUpdateListeners(requestTimeLong);
> return;
> }
> }
> }
> {code}
> h3. Definition of done
> Replace all HybridClock#update's to the fastUpdate where the result value is
> not used.
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