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* Latency test implementation in LedgerApiBenchTool changelog_begin changelog_end * Addressed review comments |
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ledger-api-bench-tool
The ledger-api-bench-tool is a tool for measuring performance of a ledger.
It allows to run multiple concurrent streams reading transactions from a ledger and provides performance statistics
for such streams.
Please note that the ledger-api-bench-tool does not provide a load source for the ledger.
Running
Run using bazel run:
bazel run -- //ledger/ledger-api-bench-tool --help
or using a fat jar:
bazel build //ledger/ledger-api-bench-tool:ledger-api-bench-tool_deploy.jar
java -jar bazel-bin/ledger/ledger-api-bench-tool/ledger-api-bench-tool_deploy.jar --help
Metrics
CountRateMetric
Number of elements processed per second.
Unit: [elem/s]
periodic value = (number of elements in the last period) / (period duration)
final value = (total number of elements processed) / (total duration)
TotalCountMetric
Total number of processed elements.
Unit: [-]
periodic value = (number of elements processed so far)
final value = (total number of elements processed)
SizeMetric
Amount of data processed per second.
Unit: [MB/s]
periodic value = (number of megabytes processed in the last period) / (period duration)
final value = (total number of megabytes processed) / (total duration)
DelayMetric
Record time delay of a stream element is defined as follows:
record time delay = (current time) - (record time of a processed element)
The delay metric measures mean delay of elements processed in a period of time.
Unit: [s]
periodic value = (mean record time delay of elements processed in a period of time)
final value = N/A
Note that in case of running the ledger-api-bench-tool against a ledger with live data, the delay metric
is expected to converge to 0s which is equivalent to being up-to-date with the most recent data.
ConsumptionSpeedMetric
Describe the ratio between a time span covered by record times of processed elements to the period duration.
Unit: [-]
Additional definitions:
previous latest record time = (record time of the latest element from periods before the current period)
latest record time = (record time of the latest element in the current period OR undefined in case of a period without a single element)
periodic value =
if (latest record time != undefined) ((latest record time) - (previous latest record time)) / (period duration)
else 0.0
final value = N/A