TruffleSqueakLauncher consumes 100–300% CPU on macOS

hpi-swa / trufflesqueak

A Squeak/Smalltalk VM and Polyglot Programming Environment for the GraalVM.

MIT License

286 stars 14 forks source link

TruffleSqueakLauncher consumes 100–300% CPU on macOS #133

Closed jirir closed 3 years ago

jirir commented 3 years ago

Activity Monitor shows about 100–300% CPU taken by TruffleSqueakLauncher after running: /Applications/graalvm/graalvm-ce-java11-20.2.0/Contents/Home/languages/smalltalk/bin/trufflesqueak

Also the windows movement inside the TruffleSqueak-20.2.0.image is rather slow.

macOS 11.1 MacBook Pro Retina 13 mid 2014, 3GHz Dual-Core i7, 16GB RAM

fniephaus commented 3 years ago

Unfortunately, this is "normal" behavior. The load should go down after some seconds/minutes but will go up as you do more things in the Smalltalk environment. The reason for this is the Graal compiler "warming up" the environment in the background. You can see the compiler activity by running TruffleSqueak with "bin/trufflesqueak --engine.TraceCompilation".

fniephaus commented 3 years ago

We've written some of the limitations up in the TruffleSqueak paper and the GraalVM team is very well aware of these issues. There's not much we can do about this at this point, but we are confident that the situation improves in the future.