https://bugzilla.redhat.com/show_bug.cgi?id=1296699
Bug ID: 1296699 Summary: Eclipse 4.5 unbearably slow under GTK3 Product: Fedora Version: 23 Component: eclipse Assignee: akurtako@redhat.com Reporter: awood@redhat.com QA Contact: extras-qa@fedoraproject.org CC: akurtako@redhat.com, andjrobins@gmail.com, eclipse-sig@lists.fedoraproject.org, jerboaa@gmail.com, krzysztof.daniel@gmail.com, mat.booth@redhat.com, rgrunber@redhat.com
Created attachment 1112624 --> https://bugzilla.redhat.com/attachment.cgi?id=1112624&action=edit Thread dump of Eclipse while attempting to run debugger.
Description of problem: Eclipse 4.5 (Mars) runs unbearably slowly under GTK3. The problem manifests most significantly for me in the debugger, although I do notice it to some extant when importing projects.
Version-Release number of selected component (if applicable): % rpm -q eclipse-platform gtk3 eclipse-platform-4.5.1-6.fc23.x86_64 gtk3-3.18.6-1.fc23.x86_64
How reproducible: Unsure. It seems to be working fine on a laptop I have, but on my desktop, performance is consistently poor.
Steps to Reproduce: 1. Install eclipse-platform and eclipse-jdt 2. Import a project, create a breakpoint on a class, and then run something that would hit that breakpoint. E.g. a unit test.
Actual results: The debugger never even connects to the JVM or if it does, it's so sluggish as to be unusable.
Expected results: Working debugger.
Additional info: If I use the same workspace, same ~/.eclipse, and just run `eclipse eclipse --launcher.GTK_version 2` everything works and is quite fast. I've taken a thread dump (attached) and when using the VisualVM profiler, I see that 33% of the time is spent in org.eclipse.swt.internal.gtk.OS._gdk_window_get_origin[native] with an additional 28% in org.eclipse.swt.internal.gtk.OS._gdk_cairo_region_create_from_surface[native]
Please let me know any additional information you might need and I will be happy to provide it.