Is there a maximum number you can set Xmx to when trying to increase jvm memory

Question

Is there a max  size you can set Xmx to  I set it to 1024m and eclipse opens ok  When I set it above 1024  eclipse doesn t open and I get the error  jvm terminated  Exit code -1      I was doing this because I keep getting an  java lang OutOfMemoryError  Java heap space   I am reading in a 35 5Mb  txt file and this error occurs when it s just reading in the file using the  while  line   reader readLine       null   loop  I would have thought that 1024mb would have been enough  Can anyone help me

User · Answer

Yes  there is a maximum  but it s system dependent  Try it and see  doubling until you hit a limit then searching down  At least with Sun JRE 1 6 on linux you get interesting if not always informative error messages  peregrino is netbook running  32 bit ubuntu with 2G RAM and no swap    peregrino   java -Xmx4096M -cp bin WheelPrimes  Invalid maximum heap size  -Xmx4096M The specified size exceeds the maximum representable size  Could not create the Java virtual machine   peregrino   java -Xmx4095M -cp bin WheelPrimes  Error occurred during initialization of VM Incompatible minimum and maximum heap sizes specified  peregrino   java -Xmx4092M -cp bin WheelPrimes  Error occurred during initialization of VM The size of the object heap   VM data exceeds the maximum representable size  peregrino   java -Xmx4000M -cp bin WheelPrimes  Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine    experiment reducing from 4000M until   peregrino   java -Xmx2686M -cp bin WheelPrimes   normal execution    Most are self explanatory  except -Xmx4095M which is rather odd  maybe a signed unsigned comparison    and that it claims to reserve 2686M on a 2GB machine with no swap  But it does hint that the maximum size is 4G not 2G for a 32 bit VM  if the OS allows you to address that much

User · Answer

I think that it s around 2GB  While the answer by Pete Kirkham is very interesting and probably holds truth  I have allocated upwards of 3GB without error  however it did not use 3GB in practice  That might explain why you were able to allocate 2 5 GB on 2GB RAM with no swap space  In practice  it wasn t using 2 5GB

User · Answer

Yes  there is a maximum  but it s system dependent  Try it and see  doubling until you hit a limit then searching down  At least with Sun JRE 1 6 on linux you get interesting if not always informative error messages  peregrino is netbook running  32 bit ubuntu with 2G RAM and no swap    peregrino   java -Xmx4096M -cp bin WheelPrimes  Invalid maximum heap size  -Xmx4096M The specified size exceeds the maximum representable size  Could not create the Java virtual machine   peregrino   java -Xmx4095M -cp bin WheelPrimes  Error occurred during initialization of VM Incompatible minimum and maximum heap sizes specified  peregrino   java -Xmx4092M -cp bin WheelPrimes  Error occurred during initialization of VM The size of the object heap   VM data exceeds the maximum representable size  peregrino   java -Xmx4000M -cp bin WheelPrimes  Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine    experiment reducing from 4000M until   peregrino   java -Xmx2686M -cp bin WheelPrimes   normal execution    Most are self explanatory  except -Xmx4095M which is rather odd  maybe a signed unsigned comparison    and that it claims to reserve 2686M on a 2GB machine with no swap  But it does hint that the maximum size is 4G not 2G for a 32 bit VM  if the OS allows you to address that much

User · Answer

Have a look at this for some common errors in setting the java heap  You ve probably set the heap size to a larger value than your computer s physical memory   You should avoid solving this problem by increasing the heap size  Instead  you should profile your application to see where you spend such a large amount of memory

User · Answer

I think a 32 bit JVM has a maximum of 2GB memory This might be out of date though  If I understood correctly  you set the -Xmx on Eclipse launcher  If you want to increase the memory for the program you run from Eclipse  you should define -Xmx in the  Run- Run configurations     select your class and open the Arguments tab put it in the VM arguments area  menu  and NOT on Eclipse startup  Edit  details you asked for  in Eclipse 3 4    Run- Run Configurations    if your class is not listed in the list on the left in the  Java Application  subtree  click on  New Launch configuration  in the upper left corner on the right   Main  tab make sure the project and the class are the right ones select the  Arguments  tab on the right  this one has two text areas  one is for the program arguments that get in to the args   array supplied to your main method  the other one is for the VM arguments  put into the one with the VM arguments lower one iirc  the following  -Xmx2048m  I think that 1024m should more than enough for what you need though  Click Apply  then Click Run Should work

User · Answer

Have a look at this for some common errors in setting the java heap  You ve probably set the heap size to a larger value than your computer s physical memory   You should avoid solving this problem by increasing the heap size  Instead  you should profile your application to see where you spend such a large amount of memory

User · Answer

I think a 32 bit JVM has a maximum of 2GB memory This might be out of date though  If I understood correctly  you set the -Xmx on Eclipse launcher  If you want to increase the memory for the program you run from Eclipse  you should define -Xmx in the  Run- Run configurations     select your class and open the Arguments tab put it in the VM arguments area  menu  and NOT on Eclipse startup  Edit  details you asked for  in Eclipse 3 4    Run- Run Configurations    if your class is not listed in the list on the left in the  Java Application  subtree  click on  New Launch configuration  in the upper left corner on the right   Main  tab make sure the project and the class are the right ones select the  Arguments  tab on the right  this one has two text areas  one is for the program arguments that get in to the args   array supplied to your main method  the other one is for the VM arguments  put into the one with the VM arguments lower one iirc  the following  -Xmx2048m  I think that 1024m should more than enough for what you need though  Click Apply  then Click Run Should work

User · Answer

I think a 32 bit JVM has a maximum of 2GB memory This might be out of date though  If I understood correctly  you set the -Xmx on Eclipse launcher  If you want to increase the memory for the program you run from Eclipse  you should define -Xmx in the  Run- Run configurations     select your class and open the Arguments tab put it in the VM arguments area  menu  and NOT on Eclipse startup  Edit  details you asked for  in Eclipse 3 4    Run- Run Configurations    if your class is not listed in the list on the left in the  Java Application  subtree  click on  New Launch configuration  in the upper left corner on the right   Main  tab make sure the project and the class are the right ones select the  Arguments  tab on the right  this one has two text areas  one is for the program arguments that get in to the args   array supplied to your main method  the other one is for the VM arguments  put into the one with the VM arguments lower one iirc  the following  -Xmx2048m  I think that 1024m should more than enough for what you need though  Click Apply  then Click Run Should work

User · Answer

Have a look at this for some common errors in setting the java heap  You ve probably set the heap size to a larger value than your computer s physical memory   You should avoid solving this problem by increasing the heap size  Instead  you should profile your application to see where you spend such a large amount of memory

User · Answer

Have a look at this for some common errors in setting the java heap  You ve probably set the heap size to a larger value than your computer s physical memory   You should avoid solving this problem by increasing the heap size  Instead  you should profile your application to see where you spend such a large amount of memory

User · Answer

I think a 32 bit JVM has a maximum of 2GB memory This might be out of date though  If I understood correctly  you set the -Xmx on Eclipse launcher  If you want to increase the memory for the program you run from Eclipse  you should define -Xmx in the  Run- Run configurations     select your class and open the Arguments tab put it in the VM arguments area  menu  and NOT on Eclipse startup  Edit  details you asked for  in Eclipse 3 4    Run- Run Configurations    if your class is not listed in the list on the left in the  Java Application  subtree  click on  New Launch configuration  in the upper left corner on the right   Main  tab make sure the project and the class are the right ones select the  Arguments  tab on the right  this one has two text areas  one is for the program arguments that get in to the args   array supplied to your main method  the other one is for the VM arguments  put into the one with the VM arguments lower one iirc  the following  -Xmx2048m  I think that 1024m should more than enough for what you need though  Click Apply  then Click Run Should work

User · Answer

Yes  there is a maximum  but it s system dependent  Try it and see  doubling until you hit a limit then searching down  At least with Sun JRE 1 6 on linux you get interesting if not always informative error messages  peregrino is netbook running  32 bit ubuntu with 2G RAM and no swap    peregrino   java -Xmx4096M -cp bin WheelPrimes  Invalid maximum heap size  -Xmx4096M The specified size exceeds the maximum representable size  Could not create the Java virtual machine   peregrino   java -Xmx4095M -cp bin WheelPrimes  Error occurred during initialization of VM Incompatible minimum and maximum heap sizes specified  peregrino   java -Xmx4092M -cp bin WheelPrimes  Error occurred during initialization of VM The size of the object heap   VM data exceeds the maximum representable size  peregrino   java -Xmx4000M -cp bin WheelPrimes  Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine    experiment reducing from 4000M until   peregrino   java -Xmx2686M -cp bin WheelPrimes   normal execution    Most are self explanatory  except -Xmx4095M which is rather odd  maybe a signed unsigned comparison    and that it claims to reserve 2686M on a 2GB machine with no swap  But it does hint that the maximum size is 4G not 2G for a 32 bit VM  if the OS allows you to address that much

User · Answer

Yes  there is a maximum  but it s system dependent  Try it and see  doubling until you hit a limit then searching down  At least with Sun JRE 1 6 on linux you get interesting if not always informative error messages  peregrino is netbook running  32 bit ubuntu with 2G RAM and no swap    peregrino   java -Xmx4096M -cp bin WheelPrimes  Invalid maximum heap size  -Xmx4096M The specified size exceeds the maximum representable size  Could not create the Java virtual machine   peregrino   java -Xmx4095M -cp bin WheelPrimes  Error occurred during initialization of VM Incompatible minimum and maximum heap sizes specified  peregrino   java -Xmx4092M -cp bin WheelPrimes  Error occurred during initialization of VM The size of the object heap   VM data exceeds the maximum representable size  peregrino   java -Xmx4000M -cp bin WheelPrimes  Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine    experiment reducing from 4000M until   peregrino   java -Xmx2686M -cp bin WheelPrimes   normal execution    Most are self explanatory  except -Xmx4095M which is rather odd  maybe a signed unsigned comparison    and that it claims to reserve 2686M on a 2GB machine with no swap  But it does hint that the maximum size is 4G not 2G for a 32 bit VM  if the OS allows you to address that much

User · Answer

I think that it s around 2GB  While the answer by Pete Kirkham is very interesting and probably holds truth  I have allocated upwards of 3GB without error  however it did not use 3GB in practice  That might explain why you were able to allocate 2 5 GB on 2GB RAM with no swap space  In practice  it wasn t using 2 5GB

[java] Is there a maximum number you can set Xmx to when trying to increase jvm memory?

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