NSNotificationCenter CPU usage problem
NSNotificationCenter CPU usage problem
- Subject: NSNotificationCenter CPU usage problem
- From: Mike Crowe <email@hidden>
- Date: Thu, 28 May 2009 15:51:47 +0100
Hi all,
I'm running into a CPU usage problem with my Cocoa application. Basically
once the app has been running for a few hours it starts, all of a sudden, to
steadily consume an increasing amount of CPU.
On further investigation with Instruments, it seems that object allocations
seem to be the cause:
# Object Address Category Creation Time Size Responsible
Library Responsible Caller
26319 0x9b23e50 02:34.281 Foundation -[NSNotificationCenter
addObserver:selector:name:object:]
26320 0x9b23e60 02:34.285 Foundation -[NSNotificationCenter
addObserver:selector:name:object:]
26321 0x9b23e70 02:34.290 Foundation -[NSNotificationCenter
addObserver:selector:name:object:]
26322 0x9b23e80 02:34.295 Foundation -[NSNotificationCenter
addObserver:selector:name:object:]
26323 0x9b23e90 02:34.299 Foundation -[NSNotificationCenter
addObserver:selector:name:object:]
26324 0x9b23ea0 02:34.302 Foundation -[NSNotificationCenter
addObserver:selector:name:object:]
26325 0x9b23eb0 02:34.306 Foundation -[NSNotificationCenter
addObserver:selector:name:object:]
26326 0x9b23ec0 02:34.309 Foundation -[NSNotificationCenter
addObserver:selector:name:object:]
The screenshot below from Instruments shows the graph steadily increasing as
more and more observers are added:
http://jottle.net/Instruments.png
I am not using NSNotificationCenter directly anywhere in my application.
I've also noticed that when the app is hidden with [mainWindow
orderOut:nil]; and shown again, that the CPU usage returns to normal.
I've looked through the NSNotificationCenter docs, but haven't found
anything obvious.
I'm a novice Cocoa developer so apologies if I have overlooked something
simple.
Any help is much appreciated,
Mike.
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