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I'm using jdi interfaces to create a debugger and when I use MethodEntryRequests to enable method entry tracing the debugged program slows down by factor of tens. I have set filter for main thread and suspend policy to SUSPEND_EVENT_THREAD. Classfilter is limited and if I print any received events it doesn't show more than couple of dozen of those so it shouldn't receive too much of them. I'm debugging locally and having followind kind of command-line with the debugged java program:
-Xdebug -Xrunjdwp:transport=dt_socket,suspend=y,server=y,address=1337
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Method breakpoints will slow down debugger a lot because of the JVM design, they are expensive to evaluate. Remove method breakpoints and consider using the regular line breakpoints. To verify that you don't have any method breakpoints open .
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.
The short answer is that execution runs through the interpreter when method entries are set. I don't think there is anyway around this...
This used to be the case for all code running in debug mode but it was enhanced in 1.4... now HotSpot works for 'full-speed' debugging except in the case of method entries and exits, watchpoints and when single stepping or in methods that contain breakpoints.
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