Adriano Machado created CAMEL-26475:
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Summary: camel-management - one nanoTime per node for the
processor statistics
Key: CAMEL-26475
URL: https://issues.apache.org/jira/browse/CAMEL-26475
Project: Camel
Issue Type: Sub-task
Reporter: Adriano Machado
Assignee: Adriano Machado
Fix For: 4.24.0
Item \(c\) of the JMX statistics section of CAMEL\-25132. With the default
statistics level, each node reads {{nanoTime}} twice. Measured on JDK 21 Linux,
single threaded, on a 10 node route that does nothing: 545k exchanges per
second, 690k without {{nanoTime}}, and 695k without {{nanoTime}} and without
the {{StopWatch}} allocation, so the cost is the clock reads and not the
allocation.
A prototype that reuses the end time of the previous node as the start of the
next node reached 603k \(\+10.6%\), about 175 ns per exchange on that route.
The saving per exchange is fixed, so it is small on a route that does real
work. It costs 8 bytes on every exchange, also without JMX, and an addition to
{{ExchangeExtension}}. This will be a draft pull request so that the tradeoff
can be decided in review.
A reused time must never be stale: a route reads a fresh time, and a failure or
a node without statistics clears it.
_Claude Code on behalf of Adriano Machado \(@ammachado\)_
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