Why I am getting weird benchmark results between 0.99 and 100 percentile
Sarath Babu
sarath.chalasani46 at gmail.com
Thu May 6 05:18:09 UTC 2021
Hi Team,
When I run the JMH benchmark results using simpletime mode getting weird
benchmark results between 0.99 and 100 percentile, could you please provide
me a reasons behind.
*Results* :
Benchmark Mode
Cnt Score Error Units
CacheTest.measureCacheGet sample
152939771 0.050 ± 0.001 ms/op
CacheTest.measureCacheGet:measureCacheGet·p0.00 sample
0.001 ms/op
CacheTest.measureCacheGet:measureCacheGet·p0.50 sample
0.001 ms/op
CacheTest.measureCacheGet:measureCacheGet·p0.90 sample
0.002 ms/op
CacheTest.measureCacheGet:measureCacheGet·p0.95 sample
0.003 ms/op
CacheTest.measureCacheGet:measureCacheGet·p0.99 sample
0.003 ms/op
CacheTest.measureCacheGet:measureCacheGet·p0.999 sample
0.006 ms/op
CacheTest.measureCacheGet:measureCacheGet·p0.9999 sample
136.839 ms/op
CacheTest.measureCacheGet:measureCacheGet·p1.00 sample
4487.905 ms/op
*Code snippet:*
@Benchmark
@BenchmarkMode({ Mode.*SampleTime* })
@OutputTimeUnit(TimeUnit.*MILLISECONDS*)
@Warmup(iterations = 3)
@Measurement(iterations = 10)
*public* *void* measureCacheGet(CachePut cPut, RandomNumberBelowLakh rNum)
*throws* InterruptedException {
cPut.cache.get(rNum.key);
}
@State(Scope.*Thread*)
*public* *static* *class* RandomNumberBelowLakh {
*public* *long* key;
@Setup(Level.*Invocation*)
*public* *void* doSetup() {
key = getRandomNumber();
}
@TearDown(Level.*Invocation*)
*public* *void* doTearDown() {
key=0;
}
*public* *long* getRandomNumber() {
*return* (*long*) ((Math.*random*() * (100000 - 1)) + 1);
}
}
@State(Scope.*Benchmark*)
*public* *static* *class* CachePut {
*public* CacheManagerImpl impl;
*public* Cache cache;
@Setup
*public* *void* setup() {
impl = *new* CacheManagerImpl();
cache = impl.getCache("account");
cachePutAccountObjects();
}
*public* *void* cachePutAccountObjects() {
*for* (*long* i = 1; i <= 100000; i++) {
cache.put(i, AccountUtil.*getAccount*(i));
}
}
@TearDown
*public* *void* doTearDown() {
impl = *null*;
cache = *null*;
}
}
Thanks and Regards
C.Sarathbabu
Cont No: 9652511597
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