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speedtest1.wasm Worker

ext/wasm/speedtest1-worker.html

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See also: A main-thread variant of this page.

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Options

The following flags can be passed as URL parameters: vfs=NAME, size=N, journal=MODE, cachesize=SIZE

→ speedtest1 → speedtest1-wasmfs → speedtest1-kvvfs

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Tips:

  • Control-click the flags to (de)select multiple flags.
  • The --big-transactions flag is important for two of the bigger tests. Without it, those tests create many thousands of implicit transactions, reducing the affected tests to an absolute crawl, in particular with OPFS.
  • The easiest way to try different optimization levels is, from this directory:
$ rm -f jswasm/speedtest1.js; make -e emcc_opt='-O2' speedtest1

Then reload this page. -O2 seems to consistently produce the fastest results.