Bug 27902 - Threading and Timers shows degraded performance over time on Mac
Summary: Threading and Timers shows degraded performance over time on Mac
Alias: None
Product: Xamarin.Mac
Classification: Desktop
Component: Library (Xamarin.Mac.dll) ()
Version: 1.10.0
Hardware: Macintosh Mac OS
: Normal normal
Target Milestone: 2.4.0 (C6)
Assignee: Chris Hamons
Depends on:
Reported: 2015-03-11 14:01 UTC by James
Modified: 2015-03-27 14:29 UTC (History)
4 users (show)

Is this bug a regression?: ---
Last known good build:

Sample of Issue (20.76 KB, application/zip)
2015-03-11 14:01 UTC, James
Sample Console output displaying the change in results over time (2.31 KB, text/plain)
2015-03-11 14:04 UTC, James

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Description James 2015-03-11 14:01:11 UTC
Created attachment 10272 [details]
Sample of Issue

Attached project exhibits the issue:

In the AppDelegate.cs file, there is a System.Timers.Timer object to log a message to the console every 5 seconds, and then also create a task that sits in a loop that calls Task.Delay(5000). Initially everything is fine but after 10-15 loops, they begin taking 15 seconds and eventually they both seem to return from sleep/get called simultaneously at 15 second intervals. 

I can reproduce this with JUST the timer or task, but wanted to demonstrate that it effects more than just one type of timer.
Comment 1 James 2015-03-11 14:04:46 UTC
Created attachment 10273 [details]
Sample Console output displaying the change in results over time
Comment 2 James 2015-03-11 14:24:27 UTC
I just realized the project is referencing MonoMac, and is not part of the unified API. Upon upgrading this issue is no longer exhibited. This can be closed
Comment 5 Timothy Risi 2015-03-25 15:31:05 UTC
I've been unable to reproduce this on XM using the attached sample.  Could you test it out again and see if you're still having issues with it?
Comment 6 Josh Ferguson 2015-03-25 16:29:57 UTC
I just updated to 5.8.2 in the alpha channel and can still reproduce the issue. Here's my info:

Xamarin Studio
Version 5.8.2 (build 5)
Installation UUID: 3ecdda6d-fd0e-4e5d-bafa-e96dee903a6d
	Mono 3.12.1 ((detached/b63df7d)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 312010002

Apple Developer Tools
Xcode 6.2 (6776)
Build 6C131e

Version: (Starter Edition)
Hash: f5d0c5e
Build date: 2015-03-20 06:51:49-0400

Version: (Starter Edition)
Android SDK: /Users/joshferguson/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		2.1   (API level 7)
		2.2   (API level 8)
		2.3   (API level 10)
		3.1   (API level 12)
		4.0.3 (API level 15)
		4.4   (API level 19)
Java SDK: /usr
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

Xamarin Android Player
Not Installed

Version: (Trial Edition)

Build Information
Release ID: 508020005
Git revision: 541c06a4f6c95383333375d56fd6c23ce48cb916
Build date: 2015-03-20 09:23:08-04
Xamarin addins: 02510c4990dee3475c282b3182d588975a63ff07

Operating System
Mac OS X 10.10.3
Darwin Retina-MacBook-Pro.local 14.3.0 Darwin Kernel Version 14.3.0
    Mon Mar 16 23:12:31 PDT 2015
    root:xnu-2782.20.48~4/RELEASE_X86_64 x86_64
Comment 8 James 2015-03-26 15:50:49 UTC
It appears app nap was affecting perforance

_activity = NSProcessInfo.ProcessInfo.BeginActivity(NSActivityOptions.Background | NSActivityOptions.LatencyCritical, "GoDriveProcessing”);

appears to smooth out behavior and run without the delay after a time.
Comment 9 Chris Hamons 2015-03-27 14:29:46 UTC
I believe ^ solves your issue. Please reopen if you have additional questions on this issue.