Invalid maximum heap size linux

Java intellji Invalid maximum heap size

Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. Invalid maximum heap size: -Xmx4096M The specified size exceeds the maximum representable size. Process finished with exit code 1

i have this error when i start to excute my program with intellji in edite configration i change Vm options to :

i want to read some large data and it give me this error i change the value to -Xms4095M -Xmx4095M it give me error when excute

this program want a 5G of ram i have 2 ram 4G and the win7 let me use all of 8G. but here i cant put a value bigger than 4095M !! how i can solve it?

1 Answer 1

Error: Intellij heap size snap

This answer is only for the linux/debian users.

So, I changed the max heap size from 750m to 2048m. When i changed this, I was unable to start the intellij.

Invalid maximum heap size: -Xmx2048m The specified size exceeds the maximum representable size. Could not create the Java virtual machine. 

I installed the intellij by the help of snap. So, the contents of all the snaps where installed at /snap/intellij.

These contents were read-only. So, you cannot change the vmoptions here.

The actual customized vmoptions is present in the user directory.

The name of the directory is .IntelliJIdea/config. Some of the operating systems hide this directory. So, you need to enable show the hidden files

Now, you will find the idea64.vmoptions file. Edit this file to the decrease the memory.

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Not able to increase java heap size

I have 16GB RAM on my Linux machine and have set the maximum java heap memory to 4GB using -Xmx4096m argument. But I am getting the following error when i start my process.

Invalid maximum heap size: -Xmx4096m The specified size exceeds the maximum representable size. Could not create the Java virtual machine.

It works fine when i set the value to 2048m. Is there any other configuration parameter that i need to change to increase the heap size ? Thanks in advance!

Still you are not specified if your JVM is 32 or 64 bit. FAQ quote: «On 64-bit operating systems running the 32-bit VM, the max heap size can be higher, approaching 4G on many Solaris systems.» oracle.com/technetwork/java/… $ java -version is able to tell you which JVM you are using.

3 Answers 3

its not only about how much RAM you have

on a 32 bit machine max heap available is 1628MB on a 64 bit machine max heap available is 2^64 (theoretically) but there are limitations

What OS are you using? Take a look at the Oracle Hotspot FAQ. Look out for the following section:

Why can’t I get a larger heap with the 32-bit JVM?

If you are using a 32-bit system, lower it to 1.6G. For 64-bit systems, check the supported systems list in the link provided.

Try -Xmx4066M It’s a bit less than 4G

after typing to command prompt (cmd)

java -XX:+PrintFlagsFinal -version | findstr /i "HeapSize PermSize ThreadStackSize" 

Shows me following result in order to get from bit’s to Mb you have to divide it by 1024^2=1’048’576 bits/mb

• uintx HeapSizePerGCThread = 87241520 bit (83,1999. MiB)
• uintx InitialHeapSize = 268435456 bit (256 MiB)
• uintx LargePageHeapSizeThreshold = 134217728 bit (128 MiB)
• uintx MaxHeapSize = 4263510016 bit (4066 MiB)

When I’ve tryed changing -Xmx4G and display this is showed me MaxHeapSize =0.

But when i do -XmX4066M it works for me.

My problem is with InitalHeapSize I’ve Tryed changing -Xms2G or -Xms2000M and it doesnt work for me or it refreshes every time.

After I make a new project

it throws me following resoult in one of my programs:

Max Memory: 259522560 (247.5 MiB)

Total Memory: 259522560 (247.5 MiB)

Used: 246496784 (235.07765197753906 MiB)

Free Memory: 13025776 (12.422348022460938 MiB)

and i may not increase this «Max Memory» which i think is InitialHeapSize

And I’ve tried to change it in

Controll Panel > java control panel > java (tab) > view (button) > RuntimeParameter (block) > -Xms2000M

, of course after going out I click apply but Nothing happened. still run out of my memory ;'[

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Linux: «Invalid maximum heap size: -Xmx128» with ./nzbhydra2 #23

Linux: «Invalid maximum heap size: -Xmx128» with ./nzbhydra2 #23

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I get the error below trying to start with ./nzbhydra2 (on Ubuntu 17.10 x86-64, openjdk version «1.8.0_151»)

The strange thing: it does work with the exact command from ./nzbhydra2 , so
java -Xmx128M -DfromWrapper -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=ALWAYS -jar /home/sander/Downloads/nzbhydra2/hydra-1.0.5/lib/core-1.0.5-exec.jar —datafolder /home/sander/Downloads/nzbhydra2/hydra-1.0.5/data

And it also works with a plain java -jar lib/core-1.0.5-exec.jar directstart

So something strange because of or in ./nzbhydra2? Or something I’m doing wrong?

sander@sammie-1710:~/Downloads/nzbhydra2/hydra-1.0.5$ ./nzbhydra2 Logging wrapper output to /home/sander/Downloads/nzbhydra2/hydra-1.0.5/data/logs/wrapper.log 2018-01-06 23:33:34,422 INFO - Starting NZBHydra main process with command line: java -Xmx128 M -DfromWrapper -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=ALWAYS -jar /home/sander/Downloads/nzbhydra2/hydra-1.0.5/lib/core-1.0.5-exec.jar --datafolder /home/sander/Downloads/nzbhydra2/hydra-1.0.5/data in folder /home/sander/Downloads/nzbhydra2/hydra-1.0.5 Invalid maximum heap size: -Xmx128 M Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. 2018-01-06 23:33:34,459 ERROR - Main process shut down unexpectedly. If the wrapper was started in daemon mode you might not see the error output. Start Hydra manually with the same parameters in the same environment to see it sander@sammie-1710:~/Downloads/nzbhydra2/hydra-1.0.5$ 

The text was updated successfully, but these errors were encountered:

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What happens if you specify max heap size greater than available RAM

Asked in an interview. What happens if you specify max heap size (Xmx) greater than available RAM? I also wonder what happens if you specify min heap size (Xms) greater than available RAM?

3 Answers 3

The easiest way to find out is try it and see.

Edit: There are actually at least two answers to the question. Probably on a 64 bit system, as was mentioned, your app could grow and grow in memory usage and start thrashing. On a 32 bit system the story is a little different because the os is not able to give you that much heap space. For instance, if I run an app on Windows XP with 32 bit java with the command line option -Xmx2000m it will die with a message similar to the following:

Invalid maximum heap size: -Xmx2000m

The specified size exceeds the maximum representable size.

Could not create the Java virtual machine.

In Linux with 32 bit java, I get the following with -Xmx3000m:

Could not create the Java virtual machine.

Error occurred during initialization of VM

Could not reserve enough space for object heap

In Linux with 32 bit java, I get the following with -Xmx6000m

Invalid maximum heap size: -Xmx6000m

The specified size exceeds the maximum representable size.

Could not create the Java virtual machine.

Trying this with 64 bit Java, the JVM does allow you to allocate more memory than there is physical RAM, though if you ask for an extremely large amount of memory, the jvm will again fail with an error.

Only if your -Xms (minimum) is larger than available memory will you get an immediate failure on initialization of the JVM

$>java -Xms100g #JVM fails to start Error occurred during initialization of VM Could not reserve enough space for object heap 

If your —Xmx (maximum) is larger than available memory your JVM does initialize since you are not using memory yet

$>java -Xmx100g #JVM starts up fine Usage: java [-options] class [args. ] . 

If your -Xmx (maximum) is larger than the available memory (total memory to include any virtual memory) you will get a runtime failure if and only if your JVM processes actually tries to use more memory than the machine has.

OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00007f5feb100000, 927465472, 0) failed; error='Cannot allocate memory' (errno=12) # # There is insufficient memory for the Java Runtime Environment to continue. # Native memory allocation (mmap) failed to map 927465472 bytes for committing reserved memory. # An error report file with more information is saved as: # /some/file/path/hs_err_pid25.log 

It wont ‘thrash’ until it nears your -Xmx limit, but if that limit is above your available memory you will get the above memory allocation error and your program will terminate before thrashing is even considered. (And that is very dramatic!)

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