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Fix assembly for 32 bit ARM devices
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@alphadose alphadose released this 15 Aug 05:16
· 8 commits to main since this release
v2.8.1
aa439ea

Fix the assembly code in asm_arm.s and measure ZenQ's performance against channels for a low-end device (32 bit raspberry pi)

Device Info

  `.::///+:/-.        --///+//-:``    alphadose@neverwinter
 `+oooooooooooo:   `+oooooooooooo:    -------------------
  /oooo++//ooooo:  ooooo+//+ooooo.    OS: Raspbian GNU/Linux 11 (bullseye) armv7l
  `+ooooooo:-:oo-  +o+::/ooooooo:     Host: Raspberry Pi 4 Model B Rev 1.5
   `:oooooooo+``    `.oooooooo+-      Kernel: 5.15.32-v7l+
     `:++ooo/.        :+ooo+/.`       Uptime: 1 hour, 58 mins
        ...`  `.----.` ``..           Packages: 569 (dpkg)
     .::::-``:::::::::.`-:::-`        Shell: bash 5.1.4
    -:::-`   .:::::::-`  `-:::-       Terminal: /dev/pts/0
   `::.  `.--.`  `` `.---.``.::`      CPU: BCM2711 (4) @ 1.800GHz
       .::::::::`  -::::::::` `       Memory: 68MiB / 3838MiB
 .::` .:::::::::- `::::::::::``::.
-:::` ::::::::::.  ::::::::::.`:::-
::::  -::::::::.   `-::::::::  ::::
-::-   .-:::-.``....``.-::-.   -::-
 .. ``       .::::::::.     `..`..
   -:::-`   -::::::::::`  .:::::`
   :::::::` -::::::::::` :::::::.
   .:::::::  -::::::::. ::::::::
    `-:::::`   ..--.`   ::::::.
      `...`  `...--..`  `...`
            .::::::::::
             `.-::::-`

Benchstat of 20 runs

goos: linux
goarch: arm
name                                     time/op
_Chan_NumWriters1_InputSize600-4          230µs ± 4%
_ZenQ_NumWriters1_InputSize600-4          186µs ± 5%
_Chan_NumWriters3_InputSize60000-4       28.2ms ± 3%
_ZenQ_NumWriters3_InputSize60000-4       12.8ms ± 0%
_Chan_NumWriters8_InputSize6000000-4      4.14s ±10%
_ZenQ_NumWriters8_InputSize6000000-4      1.32s ± 1%
_Chan_NumWriters100_InputSize6000000-4    5.97s ± 5%
_ZenQ_NumWriters100_InputSize6000000-4    1.48s ± 5%
_Chan_NumWriters1000_InputSize7000000-4   7.23s ± 6%
_ZenQ_NumWriters1000_InputSize7000000-4   2.09s ± 4%
_Chan_Million_Blocking_Writers-4          20.3s ± 2%
_ZenQ_Million_Blocking_Writers-4          6.96s ± 4%

name                                     alloc/op
_Chan_NumWriters1_InputSize600-4          0.00B
_ZenQ_NumWriters1_InputSize600-4          0.00B
_Chan_NumWriters3_InputSize60000-4         227B ±27%
_ZenQ_NumWriters3_InputSize60000-4        77.9B ±91%
_Chan_NumWriters8_InputSize6000000-4      499B ±189%
_ZenQ_NumWriters8_InputSize6000000-4     1.49kB ± 4%
_Chan_NumWriters100_InputSize6000000-4   27.5kB ±19%
_ZenQ_NumWriters100_InputSize6000000-4   27.7kB ±42%
_Chan_NumWriters1000_InputSize7000000-4   290kB ± 5%
_ZenQ_NumWriters1000_InputSize7000000-4   135kB ± 8%
_Chan_Million_Blocking_Writers-4          325MB ± 0%
_ZenQ_Million_Blocking_Writers-4         76.2MB ± 3%

name                                     allocs/op
_Chan_NumWriters1_InputSize600-4           0.00
_ZenQ_NumWriters1_InputSize600-4           0.00
_Chan_NumWriters3_InputSize60000-4         1.00 ± 0%
_ZenQ_NumWriters3_InputSize60000-4         0.00
_Chan_NumWriters8_InputSize6000000-4      4.30 ±109%
_ZenQ_NumWriters8_InputSize6000000-4       19.2 ± 9%
_Chan_NumWriters100_InputSize6000000-4      171 ±13%
_ZenQ_NumWriters100_InputSize6000000-4      194 ±25%
_Chan_NumWriters1000_InputSize7000000-4   1.84k ± 3%
_ZenQ_NumWriters1000_InputSize7000000-4   1.09k ± 4%
_Chan_Million_Blocking_Writers-4          2.00M ± 0%
_ZenQ_Million_Blocking_Writers-4          1.00M ± 0%

Conclusion -> ZenQ scales better even in low-end devices

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