[whatwg] Proposal: navigator.cores
w3c at adambarth.com
Sat May 3 10:49:00 PDT 2014
Over on blink-dev, we've been discussing  adding a property to navigator
that reports the number of cores . As far as I can tell, this
functionality exists in every other platform (including iOS and Android).
Some of the use cases for this feature have been discussed previously on
this mailing list  and rejected in favor of a more complex system,
perhaps similar to Grand Central Dispatch . Others have raised concerns
that exposing the number of cores could lead to increased fidelity of
My view is that the fingerprinting risks are minimal. This information is
already available to web sites that wish to spend a few seconds probing
your machine . Obviously, exposing this property makes that easier and
more accurate, which is why it's useful for developers.
IMHO, a more complex worker pool system would be valuable, but most systems
that have such a worker pool system also report the number of hardware
threads available. Examples:
GetSystemInfo returns dwNumberOfProcessors
sysctl returns HW_AVAILCPU or HW_NCPU
In fact, the web was the only platform I could find that didn't make the
number of cores available to developers.
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