OPFS concurrency tester using multiple independent Workers. Disclaimer: concurrency in OPFS is currently a pain point!
URL flags: pass a number of workers using
workers=N URL flag. Set the time between each
interval=N (milliseconds). Set the
number of worker iterations with
Enable OPFS VFS verbosity with
goes to the dev console). Disable/enable "unlock ASAP" mode
(higher concurrency, lower speed) with
Achtung: if it does not start to do anything within a couple of seconds, check the dev console: Chrome sometimes fails to load the wasm module due to "cannot allocate WasmMemory." Closing and re-opening the tab usually resolves it, but sometimes restarting the browser is required.