What is the relationship between JVM XMX and XMS in jmeter and the number of concurrent users

[li...@uusense.com]

hello 
    What is the relationship between JVM HEAP，XMX ， XMS in jmeter and the 
number of concurrent users
How to calculate the number of concurrent users through information such as XMX 
XMS configured by the JVM

                                                                                
                                                                                
            thanks 



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