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I want to allocate around 1GB of heap size, but I can't seem to figure it out.
How to do this?
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From the main menu, select View | Tool Windows | Profiler. Right-click the necessary process in the Profiler tool window and select CPU and Memory Live Charts. A new tab opens in which you can see the amount of resources the selected process consumes.
Limits the maximum memory heap size that the JVM can allocate for running IntelliJ IDEA. The default value depends on the platform. If you are experiencing slowdowns, you may want to increase this value, for example, to set the value to 2048 megabytes, change this option to -Xmx2048m .
IntelliJ IDEA memory usage Follow IntelliJ itself reports that it is using a little more than 1GB of heap but the OS reports that it is using anywhere from 3.5 to 4.5 GB.
Use Help | Edit Custom VM Options…
An editor will open automatically for the right .vmoptions file, adjust the value of -Xmx, save and restart IntelliJ IDEA:
Check these documents from IntelliJ IDEA knowledge base for more details:
Answers below suggest to edit .vmoptions file directly inside the application installation directory. Please note that it's not recommended since it will cause conflicts during patch updates. The method above creates a copy of the file in the CONFIG directory and your IDE installation remains intact.
Also be aware of the 32-bit address space limit on Windows which makes it hard to use heap sizes higher than 750m. Should you need to use larger heap, make sure to switch to the 64-bit JVM first, otherwise IDE may crash on start or start to crash randomly during work.
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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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