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java Programming Glossary: hotspotHow is the java memory pool divided? http://stackoverflow.com/questions/1262328/how-is-the-java-memory-pool-divided into read only and read write areas. Code Cache The HotSpot Java VM also includes a code cache containing memory that is..
Real differences between “java -server” and “java -client”? http://stackoverflow.com/questions/198577/real-differences-between-java-server-and-java-client share improve this question This is really linked to HotSpot and the default option values Java HotSpot VM Options which.. linked to HotSpot and the default option values Java HotSpot VM Options which differ between client and server configuration... configuration. From Chapter 2 of the whitepaper The Java HotSpot Performance Engine Architecture The JDK includes two flavors..
Why did java have the reputation of being slow? [closed] http://stackoverflow.com/questions/2163411/why-did-java-have-the-reputation-of-being-slow free and in some cases faster than large method code. The HotSpot compiler uses execution information to optimize method calls..
Can't run JUnit 4 test case in Eclipse Android project http://stackoverflow.com/questions/2172152/cant-run-junit-4-test-case-in-eclipse-android-project # # JRE version 6.0_17 b04 # Java VM Java HotSpot TM Client VM 14.3 b01 mixed mode windows x86 # An error report..
java.lang.UnsupportedClassVersionError: Bad version number in .class file? http://stackoverflow.com/questions/2466828/java-lang-unsupportedclassversionerror-bad-version-number-in-class-file Environment Standard Edition build 1.5.0_18 b02 Java HotSpot TM Server VM build 1.5.0_18 b02 mixed mode and check in Eclipse..
Java SE 6 vs. JRE 1.6 vs. JDK 1.6 - What do these mean? http://stackoverflow.com/questions/250517/java-se-6-vs-jre-1-6-vs-jdk-1-6-what-do-these-mean SE Runtime Environment version build 1.6.0_07 b06 and the HotSpot version on mine that's build 10.0 b23 mixed mode . I suspect.. b23 mixed mode . I suspect the 11.0 you are seeing is the HotSpot version. Update HotSpot is or used to be now they seem to use.. the 11.0 you are seeing is the HotSpot version. Update HotSpot is or used to be now they seem to use it to mean the whole VM..
http://stackoverflow.com/questions/299068/how-slow-are-java-exceptions is what slows it down. My testing using Java 1.6.0_07 Java HotSpot 10.0 on 32 bit Linux indicates that exception handling is no..
Do Java arrays have a maximum size? http://stackoverflow.com/questions/3038392/do-java-arrays-have-a-maximum-size answer even though it's very easy to test. In a recent HotSpot VM the correct answer is Integer.MAX_VALUE 5 . Once you go beyond..
Does use of final keyword in Java improve the performance? http://stackoverflow.com/questions/4279420/does-use-of-final-keyword-in-java-improve-the-performance improve this question Usually not. For virtual methods HotSpot keeps track of whether the method has actually been overridden.. optimizations. Of course this is assuming you're using HotSpot but it's by far the most common JVM so... To my mind you should..
How do I write a correct micro-benchmark in Java? http://stackoverflow.com/questions/504103/how-do-i-write-a-correct-micro-benchmark-in-java about writing micro benchmarks from the creators of Java HotSpot Rule 0 Read a reputable paper on JVMs and micro benchmarking...
http://stackoverflow.com/questions/6093537/for-loop-optimization Java TM SE Runtime Environment build 1.6.0_22 b04 Java HotSpot TM Client VM build 17.1 b03 mixed mode sharing So if you need..
How do I detect which kind of JRE is installed — 32bit vs. 64bit http://stackoverflow.com/questions/807263/how-do-i-detect-which-kind-of-jre-is-installed-32bit-vs-64bit 1.6.0_05 java.vm.info mixed mode java.vm.name Java HotSpot TM 64 Bit Server VM java.vm.specification.name Java Virtual..
Max amount of memory per java process in windows? http://stackoverflow.com/questions/987219/max-amount-of-memory-per-java-process-in-windows Java TM SE Runtime Environment build 1.6.0_02 b06 Java HotSpot TM Client VM build 1.6.0_02 b06 mixed mode java Xms1470m Xmx1470m..
Tracking down a memory leak / garbage-collection issue in Java. http://stackoverflow.com/questions/1071631/tracking-down-a-memory-leak-garbage-collection-issue-in-java directly to the production box and resolving proven hotspots doesnt seem to be working I am left with the voodoo of tuning.. Collection blind. What I have tried Profiling and fixing hotspots. Using STW Parallel and CMS garbage collectors. Running with.. JVM tuning reference http java.sun.com javase technologies hotspot gc gc_tuning_6.html but can't really find anything explaining..
How to add checkbox to JTree node to manage multiselection? http://stackoverflow.com/questions/12870908/how-to-add-checkbox-to-jtree-node-to-manage-multiselection selectionModel private JTree tree new JTree int hotspot new JCheckBox .getPreferredSize .width public CheckTreeManager.. null return if me.getX 1.2 tree.getPathBounds path .x hotspot System.out.println me.getX 1.2 tree.getPathBounds path .x hotspot.. System.out.println me.getX 1.2 tree.getPathBounds path .x hotspot return boolean selected selectionModel.isPathSelected path..
What is an “internal address” in Java? http://stackoverflow.com/questions/13860194/what-is-an-internal-address-in-java obsoleted by the properties of modern garbage collectors. hotspot src share vm runtime synchronizer.hpp hashCode generation Possibilities..
Read Java JVM startup parameters (eg -Xmx) http://stackoverflow.com/questions/1518213/read-java-jvm-startup-parameters-eg-xmx checked into source control. java configuration jvm jvm hotspot share improve this question Try import java.lang.management.ManagementFactory..
Real differences between “java -server” and “java -client”? http://stackoverflow.com/questions/198577/real-differences-between-java-server-and-java-client differences Using JDK 1.6.0_07 currently. java jvm jvm hotspot share improve this question This is really linked to HotSpot.. improve startup time but for a different reason than the hotspot options being packaged differently with a much smaller kernel...
http://stackoverflow.com/questions/2026093/is-jvm-open-source-code java jvm share improve this question have a look at hotspot http openjdk.java.net groups hotspot share improve this answer..
Eclipse - no Java (JRE) / (JDK) … no virtual machine http://stackoverflow.com/questions/2030434/eclipse-no-java-jre-jdk-no-virtual-machine with the lastest JRE possible to benefit from the latest hotspot evolutions . You can reference that exact JRE path in your eclipse.ini..
Where to find source code for java.lang native methods? http://stackoverflow.com/questions/2292629/where-to-find-source-code-for-java-lang-native-methods Some methods such as Object.hashCode may be implemented by hotspot instead or in addition to through JNI Java. JDK6 is freely licensed..
http://stackoverflow.com/questions/3023226/android-2-2-wifi-hotspot-api 2.2 wifi hotspot API What is the API call I need to make in Android 2.2 Froyo.. call I need to make in Android 2.2 Froyo to create a Wifi hotspot as seen in the Tethering and Portable Hotspot settings item.. Portable Hotspot settings item . java android wifi jvm hotspot share improve this question You can call private boolean..
How do I write a correct micro-benchmark in Java? http://stackoverflow.com/questions/504103/how-do-i-write-a-correct-micro-benchmark-in-java benchmarking acceptable java jvm benchmarking jvm hotspot micro benchmark share improve this question Tips about writing..
Android application Wi-Fi device - AP connectivity http://stackoverflow.com/questions/5233068/android-application-wi-fi-device-ap-connectivity access point java android network programming wifi jvm hotspot share improve this question You could read the proc net..
What is Boilerplate code , Hot code and Hot spots? http://stackoverflow.com/questions/7916985/what-is-boilerplate-code-hot-code-and-hot-spots are no opportunities to speed up a program that are not a hotspot or a bottleneck. Speedup opportunities can be more diffuse than.. I detected what the problem was right OK so where's the hotspot and where's the bottleneck Clearly there's a hotspot in the.. the hotspot and where's the bottleneck Clearly there's a hotspot in the indexing operator function but is that where the problem..
Read Java JVM startup parameters (eg -Xmx) http://stackoverflow.com/questions/1518213/read-java-jvm-startup-parameters-eg-xmx A Collection of JVM Options and Charles Nutter's Favorite Hotspot JVM Flags . Both of these resources list and describe some all..
Garbage Collection and Threads http://stackoverflow.com/questions/2085544/garbage-collection-and-threads garbage collectors is not easy. Though in the case of the Hotspot GC's you can look at the source code ... EDIT in response to..
Are there inline functions in java? http://stackoverflow.com/questions/2096361/are-there-inline-functions-in-java to inline. It can be aggressive in inlining and the Hotspot JVM actually can inline non final methods. The java compilers..
How are Java Thread priorities translated to an OS thread priority? http://stackoverflow.com/questions/297804/how-are-java-thread-priorities-translated-to-an-os-thread-priority same native priority level. Here's the list based on the Hotspot code in OpenJDK 6 Solaris 1 0 2 32 3 64 4 96 5 10 127 Of note..
http://stackoverflow.com/questions/3023226/android-2-2-wifi-hotspot-api a Wifi hotspot as seen in the Tethering and Portable Hotspot settings item . java android wifi jvm hotspot share improve..
Why does the JVM still not support tail-call optimization? http://stackoverflow.com/questions/3616483/why-does-the-jvm-still-not-support-tail-call-optimization SDKs and the results were surprising. Running on Sun's Hotspot JVM for version 1.3 reveals that Hotspot doesn't perform the.. Running on Sun's Hotspot JVM for version 1.3 reveals that Hotspot doesn't perform the transformation. At default settings the..
http://stackoverflow.com/questions/4031242/how-much-memory-is-allocated-for-one-integer-object-in-java-how-to-find-out-thi Oracle engineer In the case of a Java Integer on a 32 bit Hotspot JVM the 32 bit payload a Integer.value field is accompanied..
If == compares references in Java, why does it evaluate to true with these Strings? http://stackoverflow.com/questions/4033625/if-compares-references-in-java-why-does-it-evaluate-to-true-with-these-strin The program will print Equal . At least using the Sun Hotspot and suns Javac. Here it is demonstrated on http ideone.com fXM9G..
Recurring “PermGen” in Tomcat 6 http://stackoverflow.com/questions/473011/recurring-permgen-in-tomcat-6 tuning GC this is the 1.5 edition GC FAQ 1.4.2 edition Hotspot VM options I believe this is 1.6 share improve this answer..
programatically setting max java heap size http://stackoverflow.com/questions/4789280/programatically-setting-max-java-heap-size heap memory share improve this question Not with any Hotspot JVM. The JVM heap parameters can only be specified on the command.. line and are then fixed for the lifetime of the JVM. With Hotspot Java implementations the only way to change the heap size of..
Android application Wi-Fi device - AP connectivity http://stackoverflow.com/questions/5233068/android-application-wi-fi-device-ap-connectivity How can this be achieved Check out Review Sprint Mobile Hotspot on HTC EVO 4G . It shows an application that can actually display..
Why catch Exceptions in Java, when you can catch Throwables? http://stackoverflow.com/questions/581878/why-catch-exceptions-in-java-when-you-can-catch-throwables occurs while attempting to allocate an array in Hotspot at least it seems you can safely recover from this. There are.. invoke your catch clause on an Error. I've definitely seen Hotspot glibly gloss over attempts to catch certain OutOfMemoryErrors..
http://stackoverflow.com/questions/7513185/what-is-reservedcodecachesize is an option for the just in time compiler of the Java Hotspot VM. Basically it sets the maximum size for the compiler's code.. forcibly terminated . When to set this option when having Hotspot compiler failures to reduce memory needed by the JVM and hence..
Date columns in SQL-Server (MSSQL-JDBC 3.0) running under Java 1.7.0 retrieved as 2 days in the past http://stackoverflow.com/questions/7724258/date-columns-in-sql-server-mssql-jdbc-3-0-running-under-java-1-7-0-retrieved-a occurs even when running with Xint so its not caused by Hotspot bugs. Edit2 Old drivers Microsoft 1.28 work properly with JDK1.7.0..
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