jmh Questions
1
Solved
I have a microbenchmark that shows very strange results:
@BenchmarkMode(Mode.Throughput)
@Fork(1)
@State(Scope.Thread)
@Warmup(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS, batchSize = 1...
Irretrievable asked 2/6, 2017 at 17:14
0
Throughput mode gives me 21 ops/ms. So, I'd thought on average one op takes 1/21 ms. Average mode however gives me the score of 0.937 ms/op. How to interpret the results?
Throughput mode:
Result ...
Gussy asked 9/5, 2017 at 10:55
1
I'm working on a maven project. The scenario is something like below...
class Test {
public void applyAll() {
....................
....................
Collection<Migratable> applicable...
Exocrine asked 6/4, 2017 at 9:37
2
Solved
I was just migrating a module from the old java dates to the new java.time API, and noticed a huge drop in performance. It boiled down to parsing of dates with timezone (I parse millions of them at...
Southdown asked 19/12, 2015 at 19:21
2
Solved
I've seen a lot of threads here that compare and try to answer which is faster: newInstance or new operator.
Looking at the source code, it would seem that newInstance should be much slower, I mea...
Gigantism asked 14/3, 2017 at 12:55
2
Solved
I've set up a JMH benchmark to measure what would be faster Arrays.fill with null, System.arraycopy from a null array, zeroying a DirectByteBuffer or zeroying an unsafe memory block trying to answe...
Vasiliki asked 17/2, 2017 at 13:27
3
Solved
I'm playing with jmh and in the section about looping they said that
You might notice the larger the repetitions count, the lower the
"perceived" cost of the operation being measured. Up to th...
Lingenfelter asked 28/10, 2016 at 12:36
1
Solved
My current setup:
public void launchBenchmark() throws Exception {
Options opt = new OptionsBuilder()
.include(this.getClass().getName())
.mode(Mode.Throughput) //Calculate number of operation...
Monogenetic asked 17/10, 2016 at 8:16
1
Solved
I'm running a jmh benchmark, but the invocations in each trial are occurring in serial. How can I make the invocations run concurrently?
Here's a summary of my code:
@State(Scope.Benchmark)
publ...
Carmody asked 22/9, 2016 at 16:32
1
I'm new to micro bench-marking in general. When I execute the JMH task in my project I get "ERROR: Unable to find the resource: /META-INF/BenchmarkList", I believe is created by jmh-generator-annpr...
Metallize asked 3/8, 2016 at 22:26
1
Solved
I am working on a Maven project and I wish to use jmh to benchmark my code. I want to organize my project so that it contains the source code, unit tests, and benchmarks. There seems to be a way in...
Freesia asked 10/8, 2016 at 18:24
2
Solved
While playing with jmh I came across a weird thing I cannot explain.
@BenchmarkMode(Mode.SingleShotTime)
@Measurement(iterations = 10, batchSize = Integer.MAX_VALUE)
@Warmup(iterations = 5, batchS...
1
Solved
While I was testing the read performance of a direct java.nio.ByteBuffer I noticed that the absolute read is on average 2x times faster than the relative read. Also if I compare the source code of ...
Denning asked 4/9, 2016 at 18:9
4
Solved
I wrote a JMH benchmark involving 2 methods: M1 and M2. M1 invokes M2 but for some reason, JMH claims that M1 is faster than M2.
Here is the benchmark source-code:
import java.util.concurrent.TimeU...
Idou asked 31/7, 2016 at 18:6
3
I'm currently performance hunting. In order to measure the throughput, and to enforce that we don't regress, I'm using the wonderful JMH.
When I come across something that is slow though, I want t...
Moniliform asked 23/4, 2016 at 5:25
1
Solved
I'm trying to understand why it is wise to use Blackhole.consumeCPU()?
Something I found about Blackhole.consumeCPU() on Google
Sometimes when we run run a benchmark across multiple threads we als...
Eternalize asked 29/3, 2016 at 15:23
2
Solved
I have some JMH benchmarks that I'm trying to analyze. I want to enable GC logging to see how much garbage is being generated, but I can't figure out how to pass JVM arguments. I know JMH runs benc...
1
I'm using JMH benchmark in my project.
I have method 1 and method 2 annotated with @Benchmark.
I want the order to be: method1, method2, mehod1, method2... and so on...
Which means: I wand that me...
2
Solved
This post on javapapers.com shows how to run a JMH benchmark in Maven by typing mvn exec:exec. Running JMH within Maven is pretty handy, since you can easily run it from an Eclipse Run Configuratio...
1
Solved
What's the difference between setting Mode.Sample and Mode.SingleShot together with measurementIterations set to large number? Is it effectively the same or is there some quantitive difference betw...
2
Solved
I have written a benchmark for get and remove of HashMap as below:
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
public class HashMapBenchmark {
@State(Scope.Benchmark)
...
Political asked 20/1, 2016 at 12:31
1
Solved
I tried to create benchmarks with JMH and all tutorials i found refer to @GenerateMicroBenchmark.
But i cannot find it in jmh-core:1.11.3.
If it was removed, what is its replacement and what is t...
Gassaway asked 17/1, 2016 at 13:22
1
Solved
I'm trying to create the benchmark that modifies the collection.
The problem is that I don't know how to initialize data for each invocation.
Assume that Test.DATA is a collection that contains 20...
2
Solved
I have a class that constructs some complicated data (imagine a large XML or JSON structure - that sort of thing). Constructing it takes time. So I want to construct it once, and then use that same...
1
Solved
So I ran a JMH Benchmark over a few methods and got response like this:
I am not able to understand what exactly the Score and Error values signify.
Is there some reference documentation availa...
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