heap-memory

问题 I'm aware you can use MemoryLayout<T>.size to get the size of a type T . For example: MemoryLayout<Int32>.size // 4 However, for class instances (objects), MemoryLayout<T>.size returns the size of the reference to the object (8 bytes on 64 bit machines), not the size of the actual objects on the heap. class ClassA { // Objects should be at least 8 bytes let x: Int64 = 0 } class ClassB {// Objects should be at least 16 bytes let x: Int64 = 0 let y: Int64 = 0 } MemoryLayout<ClassA>.size // 8

问题 I faced an interesting problem trying to analyze a memory consumption in my Java application running on docker container vs host machine. The Java app is web app on the Jetty server 9.4.9 Java version : 1.8 Host : MAC Docker images: jetty:9.4-jre8 The docker daemon is 18.03.1-ce version. On the host I'm using Yourkit tool to analyze a memory consumption. For docker container docker stats <docker id/name> What I'm getting is that on MAC yourkit shows me 50M Non-heap size + ~40M heap size, in

问题 I want to allocate around 1GB of heap size, but I can't seem to figure it out. How to do this? 回答1: Use Help | Edit Custom VM Options… An editor will open automatically for the right .vmoptions file, adjust the value of -Xmx , save and restart IntelliJ IDEA: Check these documents from IntelliJ IDEA knowledge base for more details: Configuring JVM options and platform properties The JVM could not be started. The main method may have thrown an exception. Answers below suggest to edit .vmoptions

问题 I created an Observable(RxJava2 + Volley) that repeat for each 5 seconds, It works but when I Dump Java Heap(memory),there are many Instance of my Model JAVA class,and it will increase for each time that the Observable get repeating. Why RX create several instance of my model? How can I use only ONE instance of it? Model public RequestFuture<String> getLiveRefreshFuture() { RequestFuture<String> future = RequestFuture.newFuture(); VolleyStringRequest request = new VolleyStringRequest(Request

问题 I have a 64 bit linux os: $ uname -p x86_64 java -version listed: java version "1.6.0_43" Java(TM) SE Runtime Environment (build 1.6.0_43-b01) Java HotSpot(TM) Server VM (build 20.14-b01, mixed mode) I am trying to run a 64 bit jvm with 4096 min heap size ( Its a heavy weight app ). When i add -d64 option i get the message Running a 64-bit JVM is not supported on this platform With out -d4 option and with heap size 2048 it works fine. But the memory isnt enough so i need to use 64 bit JVM

问题 I'd like to set max heap size for my python code. In my server environment, a process in running long time with huge heap size is killed automatically. I already know if heap size is above 40G, the process will be killed. And if around 20G~30G, it's OK. Thus, I need to keep max heap size within 20G. To realize that, I found similar question in stackoverflow(How to limit the heap size?), and tried it. here is header of my code. import resource rsrc = resource.RLIMIT_DATA resource.setrlimit

问题 Earlier today I asked this question. After spending some time investigating this issue, I have discovered what is going on. I am posting this as a new question because I think it is interesting enough to track as a separate issue. I will update that question with the answer (and a link to this one). Launching unit test from debugger // Construct object Object* pObject = new Object(...); // Pointer value of pObject == 0x05176960 // Lots of other code // ... // Destroy object delete pObject; //

问题 I have tried to create a small utility which reads excel and sends email. I am using ApachePOI library for that. When I executed the code from eclipse, initially I got java.lang.OutOfMemoryError: GC overhead limit exceeded error. Then I added -Xms1024m in the VM Arguments of eclipse and program worked fine in eclipse. Then I exported the set of java programs and libraries into RunnableJar and bundled the dependent libraries. Now from command line when i execute the command java -Xms1024m -jar

问题 I have 4G memory(64-bit). Currently, I use default memory setting in Eclipse IDE(JUNO). when I deploy the application on JBoss 7.1 I get Out Of Memory error. I would like to know memory ratio of heap memory and permgen memory ? Let say, if I set 1G memory for heap memory, permgen memory will be 512M, just example. If so, permgen will be 50% of heap memory. Could you provide the way for memory allocatation for them? Currently eclipse.ini -startup plugins/org.eclipse.equinox.launcher_1.3.0

问题 Someday, I run something huge, and a window pop up said that heap memory out of memory, I set it to 2014M in that window, then click continue. Everything was fine. But I don't like the number 2014, I want it 2048. So, I changed -Xmx option in idea64.exe.vmoptions (like below) and restarted idea. (According to this doc) However, nothing was changed, heap size was still 2014M. -Xms512m -Xmx2048m -XX:ReservedCodeCacheSize=240m -XX:+UseConcMarkSweepGC -XX:SoftRefLRUPolicyMSPerMB=50 -ea -Dsun.io