最大Java内存+ TOMCAT +服务器，144GB RAM [英] max Java memory + TOMCAT + server with 144GB RAM

问题描述

我完成了我的作业，但我找不到问题的答案。

I did my homework and i could not find an answer for my problem.

我有一台144GB内存的服务器（147456MB）
我确实有java JDK 1.6.0_24-b07
我也有tomcat 7.0.10.0

I have a server with 144GB ram (147456MB) I do have java JDK 1.6.0_24-b07 I also have tomcat 7.0.10.0

我想分配尽可能多的内存。

I would like to assign as much memory as possible.

我想要像Xmx = 130000M（甚至Xmx = 135000M）。我希望拥有尽可能多的JVM内存。

I would like to have something like Xmx=130000M (or even Xmx=135000M). I want to have as much JVM memory as possible.

我无法跳过111000M它说出了堆积空间

Curently i can not jump over 111000M it says Out of Heap Space

JAVA_OPTS="$JAVA_OPTS "-Xms111000M
JAVA_OPTS="$JAVA_OPTS "-Xmx111000M
JAVA_OPTS="$JAVA_OPTS "-XX:PermSize=64M
JAVA_OPTS="$JAVA_OPTS "-XX:MaxPermSize=256M
JAVA_OPTS="$JAVA_OPTS "-d64
JAVA_OPTS="$JAVA_OPTS "-XX:+UseParallelOldGC 

我真的必须有Xms = Xmx
我尝试了很多选项而且我无法跳过。
是否有可能拥有位额外内存？

And i really have to have Xms=Xmx I tried a lot of options and I could not jump over. Is it possible to have "bit" extra memory?

问候
Bob

Regards Bob

推荐答案

首先，Java需要一些内存来管理堆。因此，如果你分配1GB堆，它将分配1.5GB（堆+ permgen +代码空间+ ....）。因此，当您说 -Xms111000M -Xmx111000M 时，您需要检查Java实际从操作系统分配的内存量。请注意，您需要 -Xms 或Java将慢慢分配内存，并且很难测试OOM条件。

First of all, Java needs a bit of memory to manage the heap. So if you allocate 1GB heap, it will allocate 1.5GB (heap + permgen + code space + ....). So you need to check how much memory Java really allocates from the OS when you say -Xms111000M -Xmx111000M. Note that you need -Xms or Java will slowly allocate the memory and it will be hard to test the OOM condition.

还要确保在一个块中实际拥有那么多可用内存。所以也许其他一些进程需要大量的RAM，或者你的RAM被分成两个较小的块（MMU不应该发生这种情况，因为进程的所有页面看起来都是连续的，但也许你发现了一个bug）。

Also make sure that you actually have that much memory available in a single chunk. So maybe some other process needs a lot of RAM or your RAM is split into two smaller chunks (should not happen with a MMU since all pages for a process will always appear to be continuous but maybe you've found a bug).

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