如何确定Hotspot VM默认线程堆栈大小 [英] How to determine Hotspot VM default thread stack size

问题描述

如果我从Windows窗口的命令行运行Java，如下所示:

If I run java from the command line on my windows box like this:

"C:\Program Files (x86)\Java\jdk1.7.0_51\bin\java.exe" -XshowSettings:all -Xss=1m -Xmx256m

我看到以下输出:

VM settings:
Stack Size: 1.00M
Max. Heap Size: 256.00M
Ergonomics Machine Class: client
Using VM: Java HotSpot(TM) Client VM

对我来说重要的部分是堆栈大小:1.00M"，这是我通过命令行选项"-Xss1m"设置的值.但是，如果删除此选项，并让VM以默认的堆栈大小运行，则会得到以下输出:

The important part for me is "Stack Size: 1.00M", which is what I set it to be via the command line option "-Xss1m". But if I remove this option and let the VM run with the default stack size I get this output:

VM settings:
Max. Heap Size: 256.00M
Ergonomics Machine Class: client
Using VM: Java HotSpot(TM) Client VM

注意，它不再显示堆栈大小".我希望如果不指定自定义"-Xss"值，则可以看到默认大小.有什么方法可以确定默认的线程堆栈大小?

Notice it no longer displays the "Stack Size" anymore. I was hoping I would see the default size if I didn't specify a custom "-Xss" value. Is there any way to determine the default thread stack size?

推荐答案

Windows应用程序的默认堆栈大小在.exe文件头中指定.
您可以使用Cygwin objdump工具或Microsoft Visual Studio dumpbin实用工具找到它:

The default stack size of Windows application is specified in .exe file header.
You can find it out using Cygwin objdump tool or with Microsoft Visual Studio dumpbin utility:

C:\Program Files\Java\jdk1.7.0_51\bin> objdump -p java.exe | grep Stack
SizeOfStackReserve      0000000000100000
SizeOfStackCommit       0000000000001000

C:\Program Files\Java\jdk1.7.0_51\bin> dumpbin.exe /headers java.exe | grep stack
      100000 size of stack reserve
        1000 size of stack commit

我们可以看到，Java 7 x64的默认堆栈大小为0x100000(1 MB).
对于x86版本，默认堆栈大小为0x50000(320 KB):

As we can see, Java 7 x64 default stack size in 0x100000 (1 MB).
For x86 version, the default stack size is 0x50000 (320 KB):

C:\Program Files (x86)\Java\jre7\bin>objdump -p java.exe | grep Stack
SizeOfStackReserve      00050000
SizeOfStackCommit       00001000

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