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<p>
OPFS concurrency tester using multiple independent Workers.
Disclaimer: concurrency in OPFS is currently a pain point!
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<p>
URL flags: pass a number of workers using
the <code>workers=N</code> URL flag. Set the time between each
workload with <code>interval=N</code> (milliseconds). Set the
number of worker iterations with <code>iterations=N</code>.
Enable OPFS VFS verbosity with <code>verbose=1-3</code> (output
goes to the dev console). Disable/enable "unlock ASAP" mode
(higher concurrency, lower speed) with <code>unlock-asap=0-1</code>.
</p>
<p>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.
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