Xcode 9: single stepping in debugger in slow

Originator:avedesk
Number:rdar://34821374 Date Originated:04-Oct-2017 11:49 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode 9
Classification:Performance Reproducible:Always
 
Summary:
Single stepping (step over) in Xcode 9 during a debug session is slow, even on the simulator. Stepping to the next line usually takes a couple of seconds. This seems to wait on the stack trace pane reloading itself completely on every step.

Steps to Reproduce:
1. Go into a debugging session on Xcode 9
2. Single step with step over thru a function complete

Expected Results:
Each step takes a normal amount of time, editor pane is never blocked

Actual Results:
- Each step takes a few seconds, rendering single stepping a frustrating experience
- the editor pane is hanging until the stack trace pane has updated itself

Version:
Xcode 9

Notes:
This was way faster in Xcode 8.  The whole UI seems to block until the stack trace pane has updated itself

Comments


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