How do I provide JVM arguments to VisualVM?

Question

I\'m using VisualVM from JDK 1.6.0_26 to profile a Java webapp running under Tomcat, but VisualVM often tells me that it doesn\'t have enough memory to take a snapshot, and to u

Answer 1

In mac, you can configure them by editing this file.

/Applications/VisualVM.app/Contents/Resources/visualvm/etc/visualvm.conf

visualvm_default_options="-J-client -J-Xms4096m -J-Xmx5120m -J-XX:+IgnoreUnrecognizedVMOptions -J-Dnetbeans.accept_license_class=com.sun.tools.visualvm.modules.startup.AcceptLicense -J-Dsun.jvmstat.perdata.syncWaitMs=10000 -J-Dsun.java2d.noddraw=true"

Answer 2

or I think this works too:

jvisualvm.exe -J-Xmx512m (or whatever amount you need)

-J on the .exe command line for onetime settings, or the .conf file noted in the other answer for changing defaults

Answer 3

I started with

jvisualvm -J-Xms1024m -J-Xmx2048m

and it worked.

Answer 4

In VisualVM 2 the config file is in the VisualVM directory where the downloaded file was extracted, in etc/visualvm.conf

${VISUALVM}/etc/visualvm.conf

Answer 5

Should be able to modify the memory settings in %JDK_HOME%\lib\visualvm\etc\visualvm.conf

Xms and Xmx are in the default_options line.

Answer 6

For Mac OSX 10.12+

If you have downloaded the visualvm dmg from https://visualvm.github.io/download.html and have moved it to the Applications directory. You can find the configuration file visualvm.conf under the location Applications/VisualVM.app/Contents/etc/visualvm.conf. In this configuration file, you can change the

visualvm_default_options="-J-client -J-Xms24m -J-Xmx256m

to(e.g.)

visualvm_default_options="-J-client -J-Xms24m -J-Xmx2048m