Re: Windows vs Linux Performance, windows host 4-6x slower than linux guest vm

[Mario Domenech Goulart]

Hi Mark,

On Mon, 6 Sep 2021 13:26:26 +0100 Mark Fisher <mark.j.fisher@gmail.com> wrote:

> I've got a windows and linux environment for Chicken on the same machine.
> linux is running in VMWare Workstation, the host is Windows 10.
>
> I'm seeing quite a difference in performance between the two; windows host is 
> running about ~4-6x slower than a VM that's running on the same machine.
>
> The code I'm running is some of the 2015 advent of code challenges I'm 
> writing to learn scheme.
> My codebase is: https://github.com/markjfisher/aoc-chicken
>
> All times below (last 3 columns) are in millis, they show Total time, then 
> times for the 2 parts that are run to make that total.
>
> building:
> $ cd build; RELEASE=1 make clean all
>
> On my linux VM
> $ ./advent2015
> Day: Part 1   Part 2   Time  P1   P2      
> 01 : 232      1783     11    6    5        
> 02 : 1606483  3842356  62    34   28      
> 03 : 2565     2639     97    27   70      
> 04 : 254575   1038736  2713  490  2223
>
> On my Windows Host
>> advent2015.exe
> Day: Part 1   Part 2   Time  P1   P2
> 01 : 232      1783     63    32   31
> 02 : 1606483  3842356  375   187  188
> 03 : 2565     2639     656   187  469
> 04 : 254575   1038736  10735 2156 8579
>
> Both are using 5.3.0rc2, both using "-O3" flags for release mode. All eggs 
> (listed in the docs/setup.md) were installed with same version of chicken.
> gcc is 10.3.0 from chocolatey in windows, and same version in linux.
>
> Is windows performance a known thing? Is there anything else I can do to make 
> the windows build more performant?
>
> - - - 8< - - -
> The compilation output for linux:
> csc -I ../ -s -d3 -O3 ../advents/2015/aoc2015day01.scm -j aoc2015day01 
> -emit-types-file aoc2015day01.types -o aoc2015day01.so
> csc -I ../ -s -d0 aoc2015day01.import.scm
> csc -I ../ -s -d3 -O3 ../advents/2015/aoc2015day02.scm -j aoc2015day02 
> -emit-types-file aoc2015day02.types -o aoc2015day02.so
> csc -I ../ -s -d0 aoc2015day02.import.scm
> csc -I ../ -s -d3 -O3 ../advents/2015/aoc2015day03.scm -j aoc2015day03 
> -emit-types-file aoc2015day03.types -o aoc2015day03.so
> csc -I ../ -s -d0 aoc2015day03.import.scm
> csc -I ../ -s -d3 -O3 ../advents/2015/aoc2015day04.scm -j aoc2015day04 
> -emit-types-file aoc2015day04.types -o aoc2015day04.so
> csc -I ../ -s -d0 aoc2015day04.import.scm
> csc -I ../ ../advents/2015/advent2015.scm -d3 -O2 -compile-syntax -o 
> advent2015
>
> For windows:
> csc -I ..\\ -s -d3 -O3 ..\\advents\\2015\\aoc2015day01.scm -j aoc2015day01 
> -emit-types-file aoc2015day01.types -o aoc2015day01.so
> csc -I ..\\ -s -d0 aoc2015day01.import.scm
> csc -I ..\\ -s -d3 -O3 ..\\advents\\2015\\aoc2015day02.scm -j aoc2015day02 
> -emit-types-file aoc2015day02.types -o aoc2015day02.so
> csc -I ..\\ -s -d0 aoc2015day02.import.scm
> csc -I ..\\ -s -d3 -O3 ..\\advents\\2015\\aoc2015day03.scm -j aoc2015day03 
> -emit-types-file aoc2015day03.types -o aoc2015day03.so
> csc -I ..\\ -s -d0 aoc2015day03.import.scm
> csc -I ..\\ -s -d3 -O3 ..\\advents\\2015\\aoc2015day04.scm -j aoc2015day04 
> -emit-types-file aoc2015day04.types -o aoc2015day04.so
> csc -I ..\\ -s -d0 aoc2015day04.import.scm
> csc -I ..\\ ..\\advents\\2015\\advent2015.scm -d3 -O2 -compile-syntax -o 
> advent2015
> - - - -

Thanks for the detailed information.

That performance discrepancy is kinda surprising, specially considering
that Linux is running as a guest on a VM on Windows.

Maybe profiling can help spot what is causing the performance
difference?

All the best.
Mario
-- 
http://parenteses.org/mario