blocks|key|269564|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|269565|是否可以将堆内存增加到物理内存的75%25+(6+6GB堆)。|blockquote|269566|269567|269568|是的你可以。事实上，如果您愿意，您可以增加到超过物理内存量。|269569|这样做是不是一个好主意取决于你的系统上运行了多少其他的东西。特别是，如果当前正在运行的应用程序和服务的“工作集”大大超过了可用的物理内存，那么您的系统就容易“崩溃”，从而花费大量时间将虚拟内存页面移入和移出磁盘。最终的结果是系统变得非常慢。|269570|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|L|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|M|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|N|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|O|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|P|7|@]|8|@]|9|$]]|$1|H|3|I|4|5|6|Q|7|@]|8|@]|9|$]]|$1|J|3|-4|4|5|6|R|7|@]|8|@]|9|$]]]|K|$]]

<blockquote>
 Can I increase the heap memory to 75%
 of physical memory(6GB Heap).
</blockquote>

Yes you can. In fact, you can increase to more than the amount of physical memory, if you want to.

Whether it is a good idea to do this depends on how much else is running on your system. In particular, if the "working set" of the applications and services that are currently running significantly exceeds the available physical memory, your system is liable to "thrash", spending a lot of time moving virtual memory pages to and from disk. The net effect is that the system gets horribly slow.

blocks|key|1700119|text|您可以在32位系统上增加到2GB。如果您使用的是64位系统，则可以使用更高的值。如果你的选择不正确，不用担心，如果你在32位系统上请求5g，java会抱怨无效值并退出。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1700120|正如其他人所说，使用cmd-line标志-例如|1700121|java+-Xmx6g+myprogram|code-block|syntax|javascript|1700122|您可以通过输入java+-X获得一个完整的列表(或者几乎是一个完整的列表)。|1700123|entityMap^0|4|2|D|3|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

You can increase to <code>2GB</code> on a <code>32</code> bit system. If you're on a 64 bit system you can go higher. No need to worry if you've chosen incorrectly, if you ask for 5g on a 32 bit system java will complain about an invalid value and quit.
As others have posted, use the cmd-line flags - e.g.
<pre><code>java -Xmx6g myprogram
</code></pre>
You can get a full list (or a nearly full list, anyway) by typing java -X.

blocks|key|1702025|text|在32位JVM上，理论上可以设置的最大堆大小是4+4gb。要使用更大的堆大小，您需要使用64位JVM。尝试以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1702026|1702027|+java+-Xmx6144M+-d64|blockquote|1702028|1702029|1702030|-d64标志很重要，因为它告诉JVM在64位模式下运行。|1702031|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|M|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|N|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|O|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|P|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|K|$]]

On a 32-bit JVM, the largest heap size you can theoretically set is 4gb. To use a larger heap size, you need to use a 64-bit JVM. Try the following:

<blockquote>
 java -Xmx6144M -d64
</blockquote>

The -d64 flag is important as this tells the JVM to run in 64-bit mode.

blocks|key|269676|text|可以使用命令行选项增加JVM分配的堆大小，这里有3个选项|type|unstyled|depth|inlineStyleRanges|entityRanges|data|269677|-Xms<size>++++++++set+initial+Java+heap+size
-Xmx<size>++++++++set+maximum+Java+heap+size
-Xss<size>++++++++set+java+thread+stack+size

java+-Xms16m+-Xmx64m+ClassName|code-block|syntax|javascript|269678|在上面的行中，我们可以将最小堆设置为16mb，将最大堆设置为64mb|269679|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

It is possible to increase heap size allocated by the JVM by using command line options
Here we have 3 options

<pre><code>-Xms&lt;size&gt; set initial Java heap size
-Xmx&lt;size&gt; set maximum Java heap size
-Xss&lt;size&gt; set java thread stack size

java -Xms16m -Xmx64m ClassName
</code></pre>

In the above line we can set minimum heap to 16mb and maximum heap 64mb

blocks|key|1700157|text|可以在eclipse+IDE+goto中直接增加由eclipse中的JVM分配的堆大小。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1700158|运行->运行配置->参数|1700159|输入-Xmx1g(用于设置最大大小，如Xmx256m或Xmx1g……m-->mb+g->gb)|1700160|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

It is possible to increase heap size allocated by the JVM in eclipse directly 
In eclipse IDE goto

Run---->Run Configurations---->Arguments

Enter -Xmx1g(It is used to set the max size like Xmx256m or Xmx1g...... m-->mb g--->gb)

blocks|key|269738|text|java+-d64+-Xms512m+-Xmx4g+HelloWorld|type|unstyled|depth|inlineStyleRanges|entityRanges|data|269739|其中，-d64:将启用64位JVM+-Xms512m:将初始堆大小设置为512MB+-Xmx4g:将最大堆大小设置为4+GB+(这里的java文件名为:+HelloWorld.java)|269740|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

java -d64 -Xms512m -Xmx4g HelloWorld

where,
-d64: Will enable 64-bit JVM
-Xms512m: Will set initial heap size as 512 MB
-Xmx4g: Will set maximum heap size as 4 GB
(here java file name is : HelloWorld.java)

blocks|key|1700200|text|这只适用于64位版本的Java。转到控制面板并单击Java图标。在Java+Control+Panel的小窗口中，单击Java菜单栏，然后单击view按钮。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1700201|如果您有两个Java平台，请禁用以前版本的Java，然后单击Runtime+parameters文本字段并写入-Xmx1024m或小于RAM。不要增加等于RAM的堆大小，否则系统会崩溃。|1700202|entityMap^0|1Z|4|0|1J|9|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

This only works with 64 bit version of Java. Go to Control Panel and click on the Java icon. On the small window of Java Control Panel, click on the Java menu bar and then click on <code>view</code> button.

If you have two Java platforms, disable the previous version of Java, then click on Runtime parameters text field and write <code>-Xmx1024m</code> or less than RAM size. Don't increase heap size equal to RAM otherwise your system will crash.

blocks|key|400846|text|请使用以下命令将堆大小更改为6+6GB|type|unstyled|depth|inlineStyleRanges|entityRanges|data|400847|export+JAVA_OPTS="-Xms6144m+-Xmx6144m+-XX:NewSize=256m+-XX:MaxNewSize=356m+-XX:PermSize=256m+-XX:MaxPermSize=356m"|code-block|syntax|javascript|400848|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Please use below command to change heap size to 6GB

<pre><code>export JAVA_OPTS="-Xms6144m -Xmx6144m -XX:NewSize=256m -XX:MaxNewSize=356m -XX:PermSize=256m -XX:MaxPermSize=356m"
</code></pre>

blocks|key|1702146|text|是的。你可以的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1702147|您可以将堆内存增加到物理内存的75%25+(6+GB堆)或更高。|1702148|由于您使用的是64位，因此可以将堆大小增加到您想要的大小。如果您使用的是32位，则限制为4+4GB。|1702149|$+java+-Xms512m+-Xmx6144m+JavaApplication|code-block|syntax|javascript|1702150|设置初始堆大小为512mb，最大堆大小为6+6GB。|1702151|希望能有所帮助..。:)|1702152|entityMap^0|0|8|0|0|0|1E|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|11|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|12|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|13|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|T|$]]

Yes. You Can.

You can increase your heap memory to 75% of physical memory (6 GB Heap) or higher.

Since You are using 64bit you can increase your heap size to your desired amount. In Case you are using 32bit it is limited to 4GB.

<pre><code>$ java -Xms512m -Xmx6144m JavaApplication
</code></pre>

Sets you with initial heap size to 512mb and maximum heapsize to 6GB.

Hope it Helps.. :)

blocks|key|1676446|text|有几个人用-Xms和-Xms的jvm选项指出了堆大小的具体答案。我想指出的是，这并不是jvm的唯一内存选项类型。具体地说，如果您使用堆栈而不是流，那么您需要通过添加额外的选项(如-Xss8m+)来增加堆栈的大小。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1676447|对于这个问题，像-Xms2g+-Xmx6g+-Xss8m这样的jvm选项将是一个解决方案。|1676448|当我在谷歌上搜索如何增加jvm内存时，我分享了这个信息，这个解决方案将我带到了这个解决方案，而这个解决方案在大量内存分配的情况下不起作用。一旦我弄清楚了具体的设置是什么，我就能够在google上搜索到如何增加堆栈大小，并找到了缺少的参数。:)希望这会节省别人的时间，就像它会为我节省大量的时间一样。:)|1676449|entityMap^0|5|4|A|4|2H|6|0|8|K|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|V|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|K|$]]

Several people pointed out the specific answers for heap size with the jvm options of <code>-Xms</code> and <code>-Xms</code>. I want to point out that this is not the only type of memory options for the jvm. Specifically if you are get stack over flows, then you'll want to increase the size of the stack by adding an additional option like <code>-Xss8m</code>. 

For this problem, the jvm options of something like <code>-Xms2g -Xmx6g -Xss8m</code> would be a solution.

I'm sharing this information as my google searches on how to increase jvm memory took me to this solution, and the solutions didn't work with high amounts of memory allocation. Once I figured out what the specific settings were for, I was able to google how to increase the stack size and found the missing param. :) Hope this saves others time, as it would of saved me a ton of time. :)

blocks|key|400913|text|您可以通过传递JVM参数-Xms和-Xmx来增加堆大小，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|400914|对于Jar文件：|400915|java+-jar+-Xms4096M+-Xmx6144M+jarFilePath.jar|code-block|syntax|javascript|400916|对于Java文件：|400917|+java+-Xms4096M+-Xmx6144M+ClassName|400918|以上参数将InitialHeapSize+(-Xms)增加到4+6GB+(4096+MB)，将MaxHeapSize(-Xmx)增加到6+6GB+(6144+MB)。|400919|但是，年轻一代堆大小将保持不变，额外的HeapSize将添加到老一代堆大小。要使年轻一代堆和老一代堆的大小相等，请使用-XX:NewRatio=1+-XX:-UseAdaptiveSizePolicy参数。|400920|java+-jar+-Xms4096M+-Xmx6144M+-XX:NewRatio=1+-XX:-UseAdaptiveSizePolicy+pathToJarFile.jar|400921|-XX:NewRatio+=老一代堆大小:年轻一代HeapSize+(你可以使用这个比率来获得你想要的比率)。|400922|entityMap^0|C|4|H|4|0|0|0|0|0|5|M|1B|H|0|3|4|V|3|1N|15|0|0|0|X|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|15|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|16|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|17|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|18|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|19|8|@$9|1A|A|1B|B|C]|$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1E|8|@$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|U|3|V|5|J|7|1L|8|@]|D|@]|E|$K|L]]|$1|W|3|X|5|6|7|1M|8|@$9|1N|A|1O|B|C]]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|1P|8|@]|D|@]|E|$]]]|Z|$]]

You can increase the Heap Size by passing JVM parameters -Xms and -Xmx like below:

For Jar Files:

<pre><code>java -jar -Xms4096M -Xmx6144M jarFilePath.jar
</code></pre>

For Java Files:

<pre><code> java -Xms4096M -Xmx6144M ClassName
</code></pre>

The above parameters increase the InitialHeapSize (-Xms) to 4GB (4096 MB) and MaxHeapSize(-Xmx) to 6GB (6144 MB). 

But, the Young Generation Heap Size will remain same and the additional HeapSize will be added to the Old Generation Heap Size. To equalize the size of Young Gen Heap and Old Gen Heap, use -XX:NewRatio=1 -XX:-UseAdaptiveSizePolicy params.

<pre><code>java -jar -Xms4096M -Xmx6144M -XX:NewRatio=1 -XX:-UseAdaptiveSizePolicy pathToJarFile.jar
</code></pre>

-XX:NewRatio = Old Gen Heap Size : Young Gen HeapSize (You can play with this ratio to get your desired ratio).

blocks|key|1700337|text|我在我的java代码中使用eclipse/STS运行py文件时遇到问题，由于jvm堆内存不足而获取PyException。我已经做了下面提到的更改，我能够解决这个问题。下面是我的系统配置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1700338|​|1700339|📷|atomic|offset|length|1700340|1700341|这些是我在我的工作区中所做的更改，瞧，它现在运行得很完美。|1700342|1700343|1700344|1700345|1700346|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://i.stack.imgur.com/CGcuS.jpg|imageAlt|1|https://i.stack.imgur.com/1aXXQ.jpg|2|https://i.stack.imgur.com/cgdcF.jpg^0|0|0|0|1|0|0|0|0|0|0|1|1|0|0|1|2|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@$G|15|H|16|1|17]]|A|$]]|$1|I|3|C|5|6|7|18|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|19|8|@]|9|@]|A|$]]|$1|L|3|C|5|6|7|1A|8|@]|9|@]|A|$]]|$1|M|3|E|5|F|7|1B|8|@]|9|@$G|1C|H|1D|1|1E]]|A|$]]|$1|N|3|E|5|F|7|1F|8|@]|9|@$G|1G|H|1H|1|1I]]|A|$]]|$1|O|3|C|5|6|7|1J|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W|X|-4]]|Y|$5|S|T|U|A|$V|Z|X|-4]]|10|$5|S|T|U|A|$V|11|X|-4]]]]

I have problem running the py files in my java code using eclipse/STS, getting PyException due to insufficient jvm heap memory. I have done the changes as mentioned below and I'm able to resolve this issue. Below is my System configuration.

<a href="https://i.stack.imgur.com/CGcuS.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CGcuS.jpg" alt="enter image description here"></a>

And these are the changes I did in my workspace and voila it runs perfect now.

<a href="https://i.stack.imgur.com/1aXXQ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1aXXQ.jpg" alt="enter image description here"></a>
<a href="https://i.stack.imgur.com/cgdcF.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cgdcF.jpg" alt="enter image description here"></a>

blocks|key|270144|text|如果有人想知道如何在windows中做到这一点，这里有一些步骤。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|270145|​|270146|📷|atomic|offset|length|270147|270148|270149|270150|270151|270152|270153|270154|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://i.stack.imgur.com/PGAcs.jpg|imageAlt|1|https://i.stack.imgur.com/BqxuH.jpg|2|https://i.stack.imgur.com/JOTex.jpg^0|0|0|0|1|0|0|0|0|0|1|1|0|0|0|0|1|2|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@$G|15|H|16|1|17]]|A|$]]|$1|I|3|C|5|6|7|18|8|@]|9|@]|A|$]]|$1|J|3|C|5|6|7|19|8|@]|9|@]|A|$]]|$1|K|3|E|5|F|7|1A|8|@]|9|@$G|1B|H|1C|1|1D]]|A|$]]|$1|L|3|C|5|6|7|1E|8|@]|9|@]|A|$]]|$1|M|3|C|5|6|7|1F|8|@]|9|@]|A|$]]|$1|N|3|E|5|F|7|1G|8|@]|9|@$G|1H|H|1I|1|1J]]|A|$]]|$1|O|3|C|5|6|7|1K|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W|X|-4]]|Y|$5|S|T|U|A|$V|Z|X|-4]]|10|$5|S|T|U|A|$V|11|X|-4]]]]

Here are the steps if someone wants to know how to do this in windows.
<a href="https://i.stack.imgur.com/PGAcs.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PGAcs.jpg" alt="" /></a>
<a href="https://i.stack.imgur.com/BqxuH.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BqxuH.jpg" alt="" /></a>
<a href="https://i.stack.imgur.com/JOTex.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JOTex.jpg" alt="" /></a>

I am working on a Windows 2003 server (64-bit) with 8 GB RAM. How can I increase the heap memory maximum? I am using the <code>-Xmx1500m</code> flag to increase the heap size to 1500 Mb. Can I increase the heap memory to 75% of physical memory (6 GB Heap)?

Increase heap size in Java

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没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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我使用的是一台Windows 2003服务器(64位)，内存为8 GB。如何增加堆内存的最大值？我使用-Xmx1500m标志将堆大小增加到1500Mb。是否可以将堆内存增加到物理内存的75% (6 GB堆)？

问增加Java中的堆大小
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