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Performace
This is maybe not perfect but can show something. All result are run using RELESE build.
Why?
Sample DEBUG run:
Run on (8 X 3600 MHz CPU s)
2017-08-05 12:44:53
***WARNING*** Library was built as DEBUG. Timings may be affected.
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Benchmark Time CPU Iterations
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checkSimpleNotification 293 ns 293 ns 2319171
Sample RELEASE run:
Run on (8 X 3600 MHz CPU s)
2017-08-05 12:45:43
---------------------------------------------------------------
Benchmark Time CPU Iterations
---------------------------------------------------------------
checkSimpleNotification 6 ns 6 ns 116492914
So below all numbers are in release.
This library as you can read in main README.md was inspired by CCNotificationCenter from cocos2d-x game engine.
So I want to present comparision of performance of this two. Of course this is only showcase.
I don't want to add submodule of cocos2d-x so simply I run it only and present results. Cocos2d-x was also build as release. If you want to repeat it here are steps I followed:
cd performance # From root of this project
git clone -b v2 https://github.com/cocos2d/cocos2d-x.git #this can take some time :/ it need to download ~900 MB
# Uncomment line in CMakeLists.txt which INCLUDE(Cocos2dxCompare.cmake)
# Apply patch CCNotificationCenterPerformance.patch
cd cocos2d-x
git apply ../CCNotificationCenterPerformance.patch
Run on (8 X 3600 MHz CPU s)
2017-08-06 00:09:43
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Benchmark Time CPU Iterations UserCounters...
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check100Listeners 234 ns 234 ns 3006299 sum=1.11993G
check100Listeners_EventBus2 216 ns 216 ns 3238994 sum=1.20662G
check100Listeners_CCNotificationCenter 1353 ns 1353 ns 535779 sum=204.383M
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check100NotificationsFor10kListeners 315 ns 315 ns 2208261 sum=370.782M
check100NotificationsFor10kListeners_EventBus2 307 ns 307 ns 2288071 sum=1122.83M
check100NotificationsFor10kListeners_CCNotificationCenter 109629 ns 109620 ns 6493 sum=61.1035M
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check100NotificationsFor1kListeners 108 ns 108 ns 6351160 sum=1.85786G
check100NotificationsFor1kListeners_EventBus2 102 ns 102 ns 6985920 sum=-1.55558G
check100NotificationsFor1kListeners_CCNotificationCenter 9684 ns 9683 ns 67812 sum=64.3065M
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check10Listeners 22 ns 22 ns 32136715 sum=1.19719G
check10Listeners_EventBus2 21 ns 21 ns 32519065 sum=1.21143G
check10Listeners_CCNotificationCenter 264 ns 264 ns 2572170 sum=98.1205M
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check10NotificationsFor1kListeners 273 ns 273 ns 2609987 sum=-1.81219G
check10NotificationsFor1kListeners_EventBus2 267 ns 267 ns 2652159 sum=-1.77676G
check10NotificationsFor1kListeners_CCNotificationCenter 11172 ns 11171 ns 62865 sum=54.023M
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check1kListeners 2158 ns 2158 ns 317734 sum=1.18365G
check1kListeners_EventBus2 2168 ns 2168 ns 326126 sum=1.21491G
check1kListeners_CCNotificationCenter 12919 ns 12918 ns 54781 sum=208.973M
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check1kNotificationsFor1kListeners 129 ns 129 ns 5459854 sum=1108.69M
check1kNotificationsFor1kListeners_EventBus2 103 ns 103 ns 6867175 sum=-1.60612G
check1kNotificationsFor1kListeners_CCNotificationCenter 9711 ns 9710 ns 67611 sum=64.9171M
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checkNotifyFor10kListenersWhenNoOneListens 2 ns 2 ns 399367972 sum=0
checkNotifyFor10kListenersWhenNoOneListens_EventBus2 2 ns 2 ns 400616370 sum=0
checkNotifyFor10kListenersWhenNoOneListens_CCNotificationCenter 125173 ns 125162 ns 5657 sum=0
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checkSimpleNotification 7 ns 7 ns 100833112 sum=384.648M
checkSimpleNotification_EventBus2 5 ns 5 ns 144959897 sum=552.978M
checkSimpleNotification_CCNotificationCenter 172 ns 172 ns 4179021 sum=15.9417M
So comparing to CCNotificationCenter, EventBus is something like ~10x FASTER especially when we have more unique notifications.