Java内存分配限制 [英] Java memory allocation limit

问题描述

我有一个循环，产生了很多线程.这些线程除其他外包含2个(大量)StringBuilder对象.然后这些线程运行并执行其操作.

I have a loop that spawns a lot of threads. These threads contains, among other things, 2 (massive) StringBuilder objects. These threads then run and do their thing.

但是，我注意到经过一定数量的线程处理后，出现了奇怪的崩溃.我知道这是因为有了这些StringBuilder，因为当我减少它们的初始容量时，我可以启动更多的线程.现在，对于这些StringBuilder，它们是在线程对象的构造函数中创建的:

However, I noticed that after a certain amount of threads, I get strange crashes. I know this is because of these StringBuilder, because when I reduce their initial capacity, I can start a lot more threads. Now for these StringBuilders, they are create like this in the constructor of the thread object:

StringBuilder a =新的StringBuilder(30000);
StringBuilder b =新的StringBuilder(30000);

StringBuilder a = new StringBuilder(30000);
StringBuilder b = new StringBuilder(30000);

它通常崩溃的点是大约550个线程，这导致多于62MB.结合程序的其余部分，正在使用的内存很可能是64MB，我在网上读到的是JVM内存分配池的减少大小.我不知道这是不是真的.

The point where it generally crashes is around 550 threads, which results in a little bit more than 62MB. Combined with the rest of the program the memory in use is most likely 64MB, which I read online somewhere was the defaulf size of the JVM memory allocation pool. I don't know whether this is true or not.

现在，我在做错什么吗，由于某种原因，由于设计原因，我以错误的方式分配了内存?还是这是唯一的方法，我应该告诉JVM增加其内存池吗?还是完全其他的东西?

Now, is there something I am doing wrong, that somehow because of the design, I am allocating memory the wrong way? Or is this the only way and should I tell the JVM to increase its memory pool? Or something else entirely?

另外，请不要告诉我设置较低的容量，我知道这些StringBuilder会在需要时自动增加容量，但是我想对此问题有一个解决方案.

Also, please do not tell me to set a lower capacity, I know these StringBuilders automatically increase their capacity when needed, but I would like to have a solution to this problem.

推荐答案

使用-Xmx JVM选项来增加Java的最大堆大小.

Use the -Xmx JVM option to increase the Java maximum heap size.

在J2SE 5.0之前，默认最大值堆大小为64MB.您可以使用-Xmx命令行选项覆盖此默认设置.

Before J2SE 5.0, the default maximum heap size was 64MB. You can override this default using the -Xmx command-line option.

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