Installation problem "The JVM could not be started. The maximum heap size (-Xmx)" an apparent fix

I'm just trying out PyCharm and immediately got nailed with the following error:

   "The JVM could not be started. The maximum heap size (-Xmx) might be too large or an antivirus or firewall tool could block the execution."

I found a few random and possibly related references to this error, and eventually stumbled on the file "C:\Program Files (x86)\JetBrains\PyCharm 2.0.2\bin\pycharm.exe.vmoptions".  In there I played with -Xmx number, and found that 200 will run.

I don't actually have any idea what this number means, or whether my IDE will keep workingor not, but so far so good.  This sounds like something the installer should verify.

I'm running Windows 7 x64 and MacAfee Endpoint Protection if that makes any difference.


Wade Hatler

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Unfortunately there is no way for the installer to verify this. The maximum possible heap size depends on your local configuration, and usually only sizes more than 1.2G cause problems.

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For me, the simple solution was to launch idea64.exe instead of idea.exe (I'm using IDEA 10.5.4). This limit is not present in the 64-bit JRE.

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