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Merge branch 'pratik/otel-phase10-workload-validation' into pratik/otel-sync-diagnostics

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Pratik Mankawde
2026-07-28 19:14:41 +01:00
parent 78411c674d 6182b15a9a
commit 018ee5558e
12 changed files with 431 additions and 92 deletions
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15
include/xrpl/nodestore/WriteStats.h
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@@ -25,7 +25,7 @@ namespace xrpl::node_store {
* |
* concurrentWriters = queue length here
* insertTotalUs / insertCount = time in the whole system (W)
* depthSum / insertCount = mean depth (L)
* depthSum / depthSamples = mean depth (L)
*
* @note All fields except @ref concurrentWriters are cumulative for the
* life of the backend, so a reader must difference successive
@@ -38,7 +38,7 @@ namespace xrpl::node_store {
* if (auto const s = backend->getWriteStats(); s && s->insertCount)
* {
* double const meanUs = double(s->insertTotalUs) / s->insertCount;
* double const meanDepth = double(s->depthSum) / s->insertCount;
* double const meanDepth = double(s->depthSum) / s->depthSamples;
* double const serviceUs = meanUs / meanDepth; // Little's Law
* }
* @endcode
@@ -73,9 +73,18 @@ struct WriteStats
/**
* Summed writer depth observed at each insert. Divided by
* @ref insertCount this gives mean depth.
* @ref depthSamples this gives mean depth.
*/
std::uint64_t depthSum = 0;
/**
* Number of depth samples summed into @ref depthSum.
*
* Divide @ref depthSum by this, not by @ref insertCount: a sample is
* taken when an insert starts, while insertCount only rises when one
* finishes, so the two populations differ while inserts are in flight.
*/
std::uint64_t depthSamples = 0;
};
} // namespace xrpl::node_store