jvm

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JVM non-deterministic elapsed times

A single threaded program running a loop of 500 million iterations takes usually about 400 ms and occasionally about 1200 ms on a 2.8 GHz linux computer.This is observed in a program that does nothing[详细]

2023-04-13 09:06 分类：问答
Making sure JVM does not optimize [duplicate]

This question already has answers here: Closed 11 years ago. Possible Duplicate: how to make sure no jvm and compiler optimization occures[详细]

2023-04-13 04:23 分类：问答
Add JVM options in Tomcat

How can I add jvm(Java virtual machine) options in Apache Tomcat 6? Is there a administration console in tomcat? I tried http://localhost:8080/admin but I could not get anything out of it.[详细]

2023-04-12 23:44 分类：问答
Implementing file upload progress in JS

How can javascript know file upload progress?Is there some kind of standard communication method between the browser and the server that tracks progr开发者_如何学运维ess and sends progress status back[详细]

2023-04-12 10:46 分类：问答
force inline in java [duplicate]

This question already has answers here: Inlining in Java (8 answers开发者_开发百科) Closed 3 years ago.[详细]

2023-04-12 08:54 分类：问答
How to force the JVM to clear all WeakReferences / keys of a WeakHashMap

Is there a way to force the jvm that it should clear all WeakReferences (or all keys of a WeakHashMap) if they aren\'t referenced by regular references anymore?[详细]

2023-04-12 08:30 分类：问答
Is there a jvm argument that causes the jvm to create an hprof file when the jvm starts up

One of our testers keeps getting a small hprof file created on his windows environment when he starts our application.[详细]

2023-04-12 07:57 分类：问答
scala speed when using get() method on hash tables? (are temporary Option() objects generated?)

I am converting some code to Scala.It\'s code that sits in an inner loop with very large amounts of data so it needs to be fast, and it involves looking up keys in a hash table and computing probabili[详细]

2023-04-12 04:36 分类：问答
Why does the JVM not wait for daemon threads spawned by user application?

\"The virtual machine terminates if the last non-daemon thread has finished.\" My question is, What happens to the daemon threads 开发者_如何学Cspawned by the application? Why does the JVM not wait fo[详细]

2023-04-12 02:09 分类：问答
Is the JVM a compiler or an interpreter?

I have a v开发者_如何学编程ery basic question about JVM: is it a compiler or an interpreter? If it is an interpreter, then what about JIT compiler that exist inside the JVM?[详细]

2023-04-11 18:19 分类：问答