wasm-example

A small example of compiling a low-level language into WebAsembly, running it in a NodeJS environment, and providing an additional performance analysis against the two.

In this particular example an iterative binary search solution is implemented in both javascript in C++.

Over 50 tests the C++ implementation appears to be an average of 2x faster than the javascript counterpart.

The compilation time of the C++ / WASM version seems to be much more consistent than the javascript.

You Can Run The Example inside a Docker Container

Ensure the docker script has permissions: dockerisedCompileAndRun Run: npm run dc:up-build

Alternatively - Run Locally

Ensure the compile script has permissions

Compile the C++ into WASM and the .js glue code required. chmod +x ./compile.sh

Compile

npm run compile

Once compiled, run the performance test.

npm start

More Info

Results against an array of size 600000 ran, 50 times.

Filling array of size 600000 with random numbers, and sorting
Testing 50 times
Calculating averages
javascript average 0.01441944
wasm average 0.00586366

Have a Play

You should be able to easily swap out the BinarySearch implementation for your own function you'd like to test. Just replace the anonymous function that is passed in as a parameter to the checkPerformance function.