java xmx

-xms and-xmx are an option for Java commands to set the available memory size for your application startup and the amount of memory available at run time. XMX is an option in Java to set the maximum amount of memory your application can use (see, just your app, not the entire JVM), and if your program takes a lot of me

-heap zones are code, constants, external access (e.g., resources for file access streams), etc. Although Java's garbage collection mechanism can solve the problem of memory waste, this mechanism is only the recyclingHeap AreaResources, and the resources for non-heap areas are helpless, and for such resource recycling can only be solved by the developer's own constraints. Even if this is the case (the heap has a Java recycle mechanism, the non-he

) parameter is greater than-XMX, or the value of-xx:permsize is greater than-xx:maxpermsize; 2)-xmx value and-xx: The sum of the maxpermsize exceeds the maximum JVM memory limit, such as the current operating system maximum memory limit, or actual physical memory, and so on. Speaking of actual physical memory here is a point, If your memory is 1024MB, but the actual system used is not likely to be 1024MB

what each parameter represents.1) heap and non-heap (non-heap) memoryAccording to the official statement, "Java virtual machines have a heap, the heap is a runtime data region, and all class instances and arrays of memory are allocated from here." The heap is created when the Java virtual machine is started. "" The memory outside the heap in the JVM is called non-heap (non-heap memory) ".You can see that t

statement: "A Java virtual machine has a heap. The heap is the runtime data area, and the memory of all class instances and arrays is allocated from this place. The heap is created when the Java Virtual Machine is started ." "Memory outside of the heap in JVM is called Non-heap memory )". JVM manages two types of memory: heap and non-heap. In short, heap is the memory available for

-xx:permsize is greater than-xx:maxpermsize; 2)-xmx value and-xx: The sum of the maxpermsize exceeds the maximum JVM memory limit, such as the current operating system maximum memory limit, or actual physical memory, and so on. Speaking of actual physical memory here is a point, if your memory is 1024MB, but the actual system used is not likely to be 1024MB, because a part of the hardware is occupied. 3. Why is the above parameter written to the Ecli

Let's first look at the mechanism of JVM memory management and then explain what each parameter represents.1) heap and non-heap (non-heap) memoryAccording to the official statement, "Java virtual machines have a heap, the heap is a runtime data region, and all class instances and arrays of memory are allocated from here." The heap is created when the Java virtual machine is started. "" The memory outside th

1. Heap and non-heap (non-heap) memoryAccording to the official statement, "Java virtual machines have a heap, the heap is a runtime data region, and all class instances and arrays of memory are allocated from here." The heap is created when the Java virtual machine is started. "" The memory outside the heap in the JVM is called non-heap (non-heap memory) ". You can see that the JVM primarily manages two ty

When the Java memory stack is not sufficient we will seek help from Java parameters-xms and-xmx. There are many examples on the internet, but many people like to set the value of-XMS and-xmx to the same, even I have seen that there is a bar-xms than-xmx (-XMS is the minimum

Heap Size SettingsThe maximum heap size in the JVM has three limitations: the data Model (32-BT or 64-bit) of the associated operating system, the system's available virtual memory limits, and the available physical memory limits for the system. Under the 32-bit system, the 1.5g~2g;64 is generally limited to memory unrestricted for the operating system. I test under Windows Server 2003 System, 3.5G physical memory, JDK5.0, Max can be set to 1478m.Typical settings: JAVANBSP; -xmx3550m-x

Transfer http://unixboy.iteye.com/blog/174173 Heap size settingsThe maximum heap size in JVM has three restrictions: the data model (32-BT or 64-bit) of the relevant operating system; the available virtual memory limit of the system; and the available physical memory limit of the system. Generally, 32-bit systems are limited to Gbps ~ 2 GB; 64 indicates that the operating system has unlimited memory. In Windows Server 2003, 1478 GB physical memory, and JDK, the maximum value is MB.Typical sett

Add #!/bin/sh under the first line of tomcat/bin/catalina.shjava_opts="-server-xms512m-xmx1024m -xx:maxnewsize=512m-xx:permsize=128m-xx:maxpermsize=256m- Djava.awt.headless=true"-xms256m JVM Initial allocation of heap memory, production environment is recommended to xmx the same, set to more than 1024m-XMX512M JVM Maximum allowable allocated heap memory, production environment is recommended to set above 1024m-xx:permsize=64m JVM Initial allocation o

Heap Size settingsThe maximum heap size in the JVM has three limitations: the data Model (32-BT or 64-bit) of the associated operating system, the system's available virtual memory limits, and the available physical memory limits for the system. Under the 32-bit system, the 1.5g~2g;64 is generally limited to memory unrestricted for the operating system. I test under Windows Server 2003 System, 3.5G physical memory, JDK5.0, Max can be set to 1478m.Typical settings:

Ext.: http://unixboy.javaeye.com/blog/174173 Heap Size SettingsThe maximum heap size in the JVM has three limitations: the data Model (32-BT or 64-bit) of the associated operating system, the system's available virtual memory limits, and the available physical memory limits for the system. Under the 32-bit system, the 1.5g~2g;64 is generally limited to memory unrestricted for the operating system. I test under Windows Server 2003 System, 3.5G physical memory, JDK5.0, Max can be set to 1478m.

Heap Size settingsThe maximum heap size in the JVM has three limitations: the data Model (32-BT or 64-bit) of the associated operating system, the system's available virtual memory limits, and the available physical memory limits for the system. Under the 32-bit system, the 1.5g~2g;64 is generally limited to memory unrestricted for the operating system. I test under Windows Server 2003 System, 3.5G physical memory, JDK5.0, Max can be set to 1478m.Typical settings:

Heap Size settingsThe maximum heap size in the JVM has three limitations: the data Model (32-BT or 64-bit) of the associated operating system, the system's available virtual memory limits, and the available physical memory limits for the system. Under the 32-bit system, the 1.5g~2g;64 is generally limited to memory unrestricted for the operating system. I test under Windows Server 2003 System, 3.5G physical memory, JDK5.0, Max can be set to 1478m.Typical settings:

Heap Size settings The maximum heap size in the JVM has three limitations: the data Model (32-BT or 64-bit) of the associated operating system, the system's available virtual memory limits, and the available physical memory limits for the system. Under the 32-bit system, the 1.5g~2g;64 is generally limited to memory unrestricted for the operating system. I test under Windows Server 2003 System, 3.5G physical memory, JDK5.0, Max can be set to 1478m. Typical settings: JAVANBSP;

operating system. The following is a combination of totalmemory () and maxmemory. The maxmemory () method returns the maximum memory that the Java Virtual Machine (this process) can dig from the operating system, in bytes. If the Java program is running, if the-xmx parameter is not added, it is 64 mb. That is to say, maxmemory () returns about 64*1024*1024 byt

-xms128m JVM Initial allocation of heap memory-XMX512M JVM Maximum allowable allocated heap memory, on demand-xx:permsize=64m JVM Initial allocation of non-heap memory-xx:maxpermsize=128m JVM Maximum allowable allocated non-heap memory, on demandThe initial allocated heap memory of the JVM is specified by-XMS, and the default is the maximum allocated heap memory for 1/64;JVM of physical memory specified by-XMX, which defaults to 1/4 of the physical me

Heap size settings The maximum heap size in JVM has three restrictions: the data model (32-BT or 64-bit) of the relevant operating system; the available virtual memory limit of the system; and the available physical memory limit of the system. Generally, 32-bit systems are limited to Gbps ~ 2 GB; 64 indicates that the operating system has unlimited memory. In Windows Server 2003, 1478 GB physical memory, and JDK, the maximum value is MB. Typical settings: