Difference between JVM and HotSpot?
What exactly is HotSpot and how does it relate to JVM and OpenJDK? Is it a library? What exactly does it do? Also, what is the difference between OpenJDK and HotSpot? 6 Answers 6
jvm-hotspot
Class JavaLaunchHelper is implemented in both … libinstrument.dylib. One of the two will be used. Which one is undefined
I upgraded to the latest Java 7u40 on MacOS X and started getting the following message on the console when launching my application using Eclipse. The app works fine but I would like to find out the cause of the problem and hopefully a fix for it. objc[10012]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.7.0_40.jdk/Contents/Home/bin/java … Read more
Real differences between “java -server” and “java -client”?
Is there any real practical difference between “java -server” and “java -client”? All I can find on Sun’s site is a vague “-server starts slower but should run faster”. What are the real differences? (Using JDK 1.6.0_07 currently.) 11 Answers 11
Does Java JIT cheat when running JDK code?
I was benchmarking some code, and I could not get it to run as fast as with java.math.BigInteger, even when using the exact same algorithm. So I copied java.math.BigInteger source into my own package and tried this: //import java.math.BigInteger; public class MultiplyTest { public static void main(String[] args) { Random r = new Random(1); long … Read more
How do I write a correct micro-benchmark in Java?
How do you write (and run) a correct micro-benchmark in Java? I’m looking for some code samples and comments illustrating various things to think about. Example: Should the benchmark measure time/iteration or iterations/time, and why? Related: Is stopwatch benchmarking acceptable? 1Best Answer 11 Tips about writing micro benchmarks from the creators of Java HotSpot: Rule … Read more
