jmh Questions
1
I do investigation about best performance of multithreading increment. I checked implementation based on synchronize, AtomicInteger and custom implementation like in AtomicInteger, but with p...
1
Solved
I have a JMH multi-thread test:
@State(Scope.Benchmark)
@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@Fork(value = 1, jvmArgsAppend = { "-Xmx512m", "-server", "-XX:+Aggre...
Serpent asked 11/10, 2015 at 13:4
1
Solved
I'm playing around with JMH ( http://openjdk.java.net/projects/code-tools/jmh/ ) and I just stumbled on a strange result.
I'm benchmarking ways to make a shallow copy of an array and I can observe...
Lucie asked 29/9, 2015 at 2:45
1
Solved
The JavaDoc of annotation @OperationsPerInvocation in the Java Microbenchmarking Harness (JMH) states:
value public abstract int value
Returns: Number of operations per single Benchmark call. Defa...
Cogitative asked 11/9, 2015 at 15:40
3
I'm trying to write a method like this:
static boolean fitsInDouble(long x) {
// return true if x can be represented
// as a numerically-equivalent double
}
And I'm trying to find the most eff...
Marketa asked 5/9, 2015 at 8:30
0
In short, my question is: why the JMH benchmarking results can be stable within fork, but differ significantly between forks.
I observed this in many benchmakrs (usually involving processing of th...
Gennygeno asked 17/8, 2015 at 9:53
1
Solved
So I'm trying to play a bit with microbenchmarks, have chosen JMH, have read some articles. How JMH measures execution of methods below system's timer granularity?
A more detailed explanation:
Th...
1
Solved
Everyone who tries to utilize JMH framework to create some meaningful tests will come across JMH sample tests
(http://hg.openjdk.java.net/code-tools/jmh/file/tip/jmh-samples/src/main/java/org/openj...
Presidentship asked 31/7, 2015 at 16:48
1
Since the beginning of CPUs it has been general knowledge that the integer division instruction is expensive. I went to see how bad it is today, on CPUs which have the luxury of billions of transis...
1
Solved
I am using Java 8 streams to iterate over a list with sublists. The outer list size varies between 100 to 1000 (different test runs) and the inner list size is always 5.
There are 2 benchmark runs...
Fifine asked 6/6, 2015 at 21:24
2
Solved
We are working on a latency sensitive application and have been microbenchmarking all kinds of methods (using jmh). After microbenchmarking a lookup method and being satisfied with the results, I i...
Branch asked 6/4, 2015 at 14:1
1
Solved
Scala
code:
@annotation.tailrec
private def fastLoop(n: Int, a: Long = 0, b: Long = 1): Long =
if (n > 1) fastLoop(n - 1, b, a + b) else b
bytecode:
private long fastLoop(int, long, lon...
Halleyhalli asked 27/3, 2015 at 20:15
1
Solved
It is well known that using a loop inside your JMH benchmark is not a good idea because it will be optimized by the JIT compiler and should therefore be avoided. Is there a way to feed my JMH bench...
2
I'm comparing 2 ways to filter lists, with and without using streams. It turns out that the method without using streams is faster for a list of 10,000 items. I'm interested in understanding why is...
Extrusive asked 6/2, 2015 at 0:53
1
Solved
I've just created a Maven project using this command:
$ mvn archetype:generate \
-DinteractiveMode=false \
-DarchetypeGroupId=org.openjdk.jmh \
-DarchetypeArtifactId=jmh-java-benchmark-archetyp...
1
Solved
JMH seems like it does most caliper features as well or better than caliper, but I couldn't figure out how to measure allocation rate, which is in general useful to be able to look at in a microben...
Inandin asked 2/12, 2014 at 23:2
1
Solved
I've decided to measure incrementation with different locking strategies and using JMH for this purpose.
I'm using JMH for checking throughput and average time as well as simple custom test for che...
Marrymars asked 18/11, 2014 at 13:45
1
Solved
I have chanced upon an instance of exceedingly erratic performance profile of a very simple map/reduce operation on primitive arrays. Here is my jmh benchmark code:
@OutputTimeUnit(TimeUnit.NANOSE...
1
Solved
I am using the JMH benchmarking framework (http://openjdk.java.net/projects/code-tools/jmh/) to run benchmarks on my code. My understanding is that JMH forks the JVM multiple times during benchmark...
Eugenioeugenius asked 29/8, 2014 at 16:55
1
Solved
I don't understand the score attribute from the JMH results? I don't find anything on the web about it, too.
Can anyone tell me, what it is about? As far as I understand is a higher score better t...
Meddlesome asked 24/7, 2014 at 8:38
1
Solved
Can someone explain why JMH saying that returning 1 is faster than returning 0 ?
Here is the benchmark code.
import org.openjdk.jmh.annotations.*;
import java.util.concurrent.TimeUnit;
@State(S...
Manslaughter asked 22/7, 2014 at 10:29
1
Solved
I am using http://openjdk.java.net/projects/code-tools/jmh/ for benchmarking and i get a result like:
Benchmark Mode Samples Score Score error Units
o.a.f.c.j.b.TestClass.test1 avgt 5 2372870,600...
Gurkha asked 13/7, 2014 at 14:8
1
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My ultimate goal is to create a comprehensive set of benchmarks for several Java primitive collection libraries using the standard Java collections as a baseline. In the past I have used the loopin...
Ditch asked 30/6, 2014 at 18:52
4
Solved
I use JMH to specify the complexity of the operation. If you've never worked with JMH, don't worry. JMH will just launch the estimateOperation method multiple times and then get the average time.
...
Adventist asked 15/6, 2014 at 20:15
2
Solved
While investigating for a little debate w.r.t. using "" + n and Integer.toString(int) to convert an integer primitive to a string I wrote this JMH microbenchmark:
@Fork(1)
@OutputTimeUnit(TimeUnit...
Chamberlin asked 20/5, 2014 at 10:13
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