How to increase IDE memory limit in IntelliJ IDEA on Mac

Question

I m using IDEA 12 Leda on Mountain Lion  I wanted to increase the maximum memory that IDE can use  I set the VMOptions in Info plist file to be -Xmx2048m -ea -XX  HeapDumpOnOutOfMemoryError -Xverify none -Xbootclasspath a    lib boot jar  When I open up IDEA  I still see the maximum memory to be 711m   jps -v shows my VMOptions has been loaded but it s replaced by the following options   29388    -Xmx2048m   -ea -XX  HeapDumpOnOutOfMemoryError -Xverify none -Xbootclasspath a    lib boot jar -Xms128m   -Xmx800m   -XX MaxPermSize 350m -XX ReservedCodeCacheSize 64m -XX  UseCodeCacheFlushing -XX  UseCompressedOops -Didea paths selector IdeaIC12 -Dsun java2d noddraw true -Didea max intellisense filesize 2500 -Didea dynamic classpath false -Didea jars nocopy false -Dsun java2d d3d false -Dapple awt fullscreencapturealldisplays false -Dapple laf useScreenMenuBar true -Djava endorsed dirs  -Dswing bufferPerWindow false -Didea fatal error notification enabled -Didea cycle buffer size 1024 -Didea popup weight heavy -Didea xdebug key -Xdebug -Dapple awt graphics UseQuartz true -Dsun java2d pmoffscreen false -Didea no launcher false -DCVS PASSFILE    cvspass -Didea use default antialiasing in editor false -Dcom apple mrj application live-resize false -Didea smooth progress false 29392 Jps -Dapplication home  System Library Java JavaVirtualMachines 1 6 0 jdk Contents Home -Xms8m   Where does -Xmx800 come from  I need to remove it

User · Answer

Here is a link to the latest documentation as of today http   www jetbrains com idea webhelp increasing-memory-heap html

User · Answer

go to that path  C  Program Files  x86  JetBrains IntelliJ IDEA 12 1 4 bin idea exe vmoptions   and change size to -Xmx512m    -Xms128m   -Xmx512m   -XX MaxPermSize 250m   -XX ReservedCodeCacheSize 64m   -XX  UseCodeCacheFlushing   -ea   -Dsun io useCanonCaches false   -Djava net preferIPv4Stack true   hope its will work

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I use Mac and Idea 14 1 7  Found idea vmoptions file here   Applications IntelliJ IDEA 14 app Contents bin   details

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It looks like IDEA solves this for you  like everything else    When loading a large project and letting it thrash  it will open a dialog to up the memory settings   Entering 2048 for Xmx and clicking  Shutdown   then restarting IDEA makes IDEA start up with more memory   This seems to work well for Mac OS  though it never seems to persist for me on Windows  not sure about IDEA 12

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On my machine this only works in bin idea vmoptions  adding the setting in   Library Preferences IntelliJIdea12 idea vmoptions causes the IDEA to hang during startup

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Helpful trick I thought I d share on this old thread   You can see how much memory is being used and adjust things accordingly using the Show memory indicator setting     It shows up in the lower right of the window

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More recent versions of IntelliJ  certainly WebStorm and PhpStorm  have made this change even easier by adding a Help  gt  gt  Change Memory Settings menu item that opens a dialog where the memory limit can be set

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OSX 10 9  if you dont bother about signed application you might just change   Applications IntelliJ  IDEA  12  CE app bin idea vmoptions

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As for the intellij2018 version I am using the following configuration for better performance  -server -Xms1024m -Xmx4096m -XX MaxPermSize 1024m -XX ReservedCodeCacheSize 512m -XX  UseCompressedOops -Dfile encoding UTF-8 -XX  UseConcMarkSweepGC -XX  AggressiveOpts -XX  CMSClassUnloadingEnabled -XX  CMSIncrementalMode -XX  CMSIncrementalPacing -XX CMSIncrementalDutyCycleMin 0 -XX -TraceClassUnloading -XX  TieredCompilation -XX SoftRefLRUPolicyMSPerMB 100 -ea -Dsun io useCanonCaches false -Djava net preferIPv4Stack true -Djdk http auth tunneling disabledSchemes    -XX  HeapDumpOnOutOfMemoryError -XX -OmitStackTraceInFastThrow -Xverify none  -XX ErrorFile  USER HOME java error in idea  p log -XX HeapDumpPath  USER HOME java error in idea hprof

User · Answer

Some addition to the top answer here https   stackoverflow com posts 13581526 revisions    Change memory as you wish in  vmoptions Enable memory view as told here https   stackoverflow com a 39563251 5515861   And you ll have something like this in the bottom right

User · Answer

For IDEA 13 and OS X 10 9 Mavericks  the correct paths are   Original   Applications IntelliJ IDEA 13 app Contents bin idea vmoptions  Copy to    Library Preferences IntelliJIdea13 idea vmoptions

User · Answer

Current version  Help   Change Memory Settings     Since IntelliJ IDEA 15 0 4 you can also use  Help   Edit Custom VM Options      This will automatically create a copy of the  vmoptions file in the config folder and open a dialog to edit it     Older versions   IntelliJ IDEA 12 is a signed application  therefore changing options in Info plist is no longer recommended  as the signature will not match and you will get issues depending on your system security settings  app will either not run  or firewall will complain on every start  or the app will not be able to use the system keystore to save passwords    As a result of addressing IDEA-94050 a new way to supply JVM options was introduced in IDEA 12      Now it can take VM options from     Library Preferences  lt appFolder gt  idea vmoptions and system properties   from   Library Preferences  lt appFolder gt  idea properties    For example  to use -Xmx2048m option you should copy the original  vmoptions file from  Applications IntelliJ IDEA app bin idea vmoptions to   Library Preferences IntelliJIdea12 idea vmoptions  then modify the -Xmx setting   The final file should look like   -Xms128m -Xmx2048m -XX MaxPermSize 350m -XX ReservedCodeCacheSize 64m -XX  UseCodeCacheFlushing -XX  UseCompressedOops   Copying the original file is important  as options are not added  they are replaced   This way your custom options will be preserved between updates and application files will remain unmodified making signature checker happy     Community Edition    Library Preferences IdeaIC12 idea vmoptions file is used instead

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