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Some CPU intensive routines get dramatically slower when run through a debugger. Why is this?
Currently I'm just using IntelliJ to step through code running in JBoss. When I start JBoss, I use these options:
set JAVA_OPTS=-Xms512m -Xmx1024m -XX:MaxPermSize=256m -Xdebug -Xrunjdwp:transport=dt_socket,address=5005,server=y,suspend=n %JAVA_OPTS% Is there a way to speed up the execution? Or to speed up certain method executions that I don't need to step through?
Update: Seems if I don't step over/into the CPU intensive routines (ie: Just run til a breakpoint set right after the routine), then the execution time is as if not in a debugger.
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Definitely debug logs slow downs the application performance.
Remove breakpoints off your method and use them inside the method as that can cause your debug to take a very long time. Try running IntelliJ as admin. I had this issue at work where debugging was extremely slow and running as admin actually made it a lot faster.
A Java program can be debugged simply by right clicking on the Java editor class file from Package explorer. Select Debug As → Java Application or use the shortcut Alt + Shift + D, J instead. Either actions mentioned above creates a new Debug Launch Configuration and uses it to start the Java application.
Some CPU intensive routines get dramatically slower when run through a debugger. Why is this?
Because the JITter won't optimize code as much (often, not at all) when debugging is enabled.
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