Annotation Type Benchmark
-
@Target(METHOD) @Retention(RUNTIME) public @interface Benchmark
Benchmark
annotates the benchmark method.JMH will produce the generated benchmark code for this method during compilation, register this method as the benchmark in the benchmark list, read out the default values from the annotations, and generally prepare the environment for the benchmark to run.
Benchmarks may use annotations to control different things in their operations. See
org.openjdk.jmh.annotations
package for available annotations, read their Javadocs, and/or look through JMH samples for their canonical uses. As the rule of thumb, most annotations may be placed either at theBenchmark
method, or at the enclosing class, to be inherited by allBenchmark
methods in the class.Benchmark
demarcates the benchmark payload, and JMH treats it specifically as the wrapper which contains the benchmark code. In order to run the benchmark reliably, JMH enforces a few stringent properties for these wrapper methods, including, but not limited to:- Method should be public
- Arguments may only include either
State
classes, which JMH will inject while calling the method (seeState
for more details), or JMH infrastructure classes, likeControl
, orBlackhole
- Method can only be synchronized if a relevant
State
is placed on the enclosing class.
If you want to benchmark methods that break these properties, you have to write them out as distinct methods and call them from
Benchmark
method.Benchmark method may declare Exceptions and Throwables to throw. Any exception actually raised and thrown will be treated as benchmark failure.