JVM常用基础参数栈内存Xss讲解

爱被打了一巴掌 2023-06-29 08:29 4阅读 0赞

JVM常用参数  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjI5NjY5_size_16_color_FFFFFF_t_70][]  
\-Xss 参数为设置单个线程栈的大小, 一般默认为512K~1024K  
其等价于 -XX:ThreadStackSize  
栈是用来运行方法的, 堆是用来存储数据.

通过此程序查看栈内存大小

public class MyHelloGc { 
    
        public static void main(String[] args) throws InterruptedException { 
    
            System.out.println("HELLO GC");
    
            Thread.sleep(Integer.MAX_VALUE);
        }
    }

将上面代码运行起来后, 用jinfo命令查看默认的栈大小  
`jinfo -flag ThreadStackSize 61156`  
![20200111155736141.png][]  
可以看到返回的值是0 , 但其真实值并不是0 , 通过查看jvm官方文档可以看到. 对于Windows操作系统, 其默认值取决于虚拟内存的大小.  
对于Linux系统或者OS X 系统, 默认值是1024KB  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjI5NjY5_size_16_color_FFFFFF_t_70 1][]  
给定栈空间128k的大小, 如下图所示  
`-Xss128k`  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjI5NjY5_size_16_color_FFFFFF_t_70 2][]  
再次运行程序, 可以查看到栈空间的大小为128k  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjI5NjY5_size_16_color_FFFFFF_t_70 3][]

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[20200111155736141.png]: https://img-blog.csdnimg.cn/20200111155736141.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjI5NjY5_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200111155019171.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjI5NjY5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjI5NjY5_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/2020011116043529.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMjI5NjY5,size_16,color_FFFFFF,t_70
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