ibessonov commented on code in PR #5637:
URL: https://github.com/apache/ignite-3/pull/5637#discussion_r2044510876
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modules/page-memory/src/main/java/org/apache/ignite/internal/pagememory/persistence/throttling/SpeedBasedMemoryConsumptionThrottlingStrategy.java:
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@@ -496,5 +506,35 @@ void reset() {
void finish() {
cpWriteSpeed.closeInterval();
threadIds.clear();
+
+ updateWriteVsFsyncCoefficient();
+ }
+
+ private void updateWriteVsFsyncCoefficient() {
+ CheckpointProgress progress = cpProgress.get();
+ assert progress != null;
+
+ if (progress.currentCheckpointPagesCount() == 0) {
+ return;
+ }
+
+ long pagesWriteTimeMillis = progress.getPagesWriteTimeMillis();
+ long fsyncTimeMillis = progress.getFsyncTimeMillis();
+
+ double coefficient = ((double) pagesWriteTimeMillis) /
(pagesWriteTimeMillis + fsyncTimeMillis);
+ if (isNaN(coefficient)) {
+ return;
+ }
+
+ double newCoefficient = writeVsFsyncCoefficient * 0.85 + coefficient *
0.15;
+
+ // Put it within reasonable bounds just in case.
Review Comment:
Too afraid of some weird artifacts. I think that 0.9 upper bound can be
ignored, but the lower bound is mandatory, otherwise we'll get huge stalls on
malfunctioning or otherwise strangely behaving storages (that often result in
huge fsync durations)
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