[macOS] Potential perf regression in Timer

[adamsitnik]

It seems to be affecting only macOS (cc @Lxiamail @jeffhandley)

git clone https://github.com/dotnet/performance.git
python3 ./performance/scripts/benchmarks_ci.py -f net5.0 net6.0 --filter System.Threading.Tests.Perf_Timer.ShortScheduleAndDisposeWithFiringTimers

Result	Ratio	Operating System
Same	1.06	Windows 10.0.19043.1165
Same	0.93	Windows 10.0.20348
Same	1.11	Windows 10.0.20348
Same	1.00	Windows 10.0.18363.1621
Same	0.91	Windows 8.1
Same	1.01	Windows 10.0.19042.685
Same	1.01	Windows 10.0.19043.1165
Same	1.01	Windows 10.0.22454
Same	1.07	Windows 10.0.22451
Same	0.97	Windows 10.0.19042.1165
Slower	0.70	Windows 7 SP1
Same	1.06	centos 8
Same	1.02	debian 10
Same	1.01	rhel 7
Faster	1.15	sles 15
Same	1.08	opensuse-leap 15.3
Same	1.10	ubuntu 18.04
Same	1.01	ubuntu 18.04
Same	1.02	alpine 3.13
Same	1.08	ubuntu 16.04
Same	1.06	Windows 10.0.19043.1165
Same	1.00	Windows 10.0.22000
Same	0.98	Windows 10.0.19043.1165
Same	1.00	Windows 10.0.18363.1621
Same	1.02	Windows 10.0.19043.1165
Slower	0.82	macOS Big Sur 11.5.2
Slower	0.75	macOS Big Sur 11.5.2
Slower	0.77	macOS Big Sur 11.4

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Issue Details

---

It seems to be affecting only macOS (cc @Lxiamail @jeffhandley)

git clone https://github.com/dotnet/performance.git
python3 ./performance/scripts/benchmarks_ci.py -f net5.0 net6.0 --filter System.Threading.Tests.Perf_Timer.ShortScheduleAndDisposeWithFiringTimers

Result	Ratio	Operating System
Same	1.06	Windows 10.0.19043.1165
Same	0.93	Windows 10.0.20348
Same	1.11	Windows 10.0.20348
Same	1.00	Windows 10.0.18363.1621
Same	0.91	Windows 8.1
Same	1.01	Windows 10.0.19042.685
Same	1.01	Windows 10.0.19043.1165
Same	1.01	Windows 10.0.22454
Same	1.07	Windows 10.0.22451
Same	0.97	Windows 10.0.19042.1165
Slower	0.70	Windows 7 SP1
Same	1.06	centos 8
Same	1.02	debian 10
Same	1.01	rhel 7
Faster	1.15	sles 15
Same	1.08	opensuse-leap 15.3
Same	1.10	ubuntu 18.04
Same	1.01	ubuntu 18.04
Same	1.02	alpine 3.13
Same	1.08	ubuntu 16.04
Same	1.06	Windows 10.0.19043.1165
Same	1.00	Windows 10.0.22000
Same	0.98	Windows 10.0.19043.1165
Same	1.00	Windows 10.0.18363.1621
Same	1.02	Windows 10.0.19043.1165
Slower	0.82	macOS Big Sur 11.5.2
Slower	0.75	macOS Big Sur 11.5.2
Slower	0.77	macOS Big Sur 11.4

Author:	adamsitnik
Assignees:	-
Labels:	area-System.Threading, os-mac-os-x, tenet-performance
Milestone:	-

[mangod9]

I am going to close this since customers havent reported any perf concerns with this.