Computation speed for various wrappers

[cooper-david-a]

Hello everybody,

I'm currently using the javascript wrapper to compute individual states and plot them on a P-H diagram or T-S diagram. https://daveisthebest.com/ThermoPropertyCalculator/

The diagrams are generated with contour plots so behind the scenes I pre-computed 200 x 200 arrays.

I was hoping to generate these arrays on the fly and expected that c++ would be much faster. However, after learning the minimum amount of cmake and running a small test, it seems my c++ implementation runs less than half as fast as the javascript in the browser.

Is this expected?

Before I spend a bunch of time troubleshooting, I was hoping someone could explain this to me or point me in some productive direction.

[dvd101x]

Hi, I would like to contribute to the discussion indirectly as I can't run C++

I ran some benchmarks comparing JavaScript and Python for a specific task.

Wrapper	Type	$\mu [\mu s]$	$\sigma [\mu s]$
Javascript (wasm)	Local	376	1.03
Jupyter pyodide (wasm)	Local	162	0.24
Jupyter python	Local	112	0.52
Google Colab	Cloud	180	27.1

Testing Methodology

• Task: Running PropsSI('T','P',101325,'Q',0,'Water')
• Hardware: MacBook Air with M1 chip and 8GB RAM (local testing)
• Benchmarking:
  • Jupyter: Magic command %%timeit resulting in (7 runs, 10,000 loops each)
  • Javascript: 7 runs, 10,000 loops each

Observations

• WebAssembly (wasm) seems to perform well in both JavaScript and Pyodide, offering comparable speed to the native Python wrapper.

[ibell]

Is the exception handling resolved? That's a non-starter until that is somehow fixed.

[ibell]

But that speed looks very promising, better than I had seen before.

[dvd101x]

Hi Ian,

They accepted my PR to fix the exception handling. They guided me through all the process.

It hasn't been published yet. I was planning on reporting back upon publishing.

pyodide/pyodide#4455

[dvd101x]

BTW I saw it is working here:
https://pyodide.org/en/latest/console.html

And referenced here:
mgreminger/EngineeringPaper.xyz@db949f4

[ibell]

Indeed that's awesome!