Virtual Threads: A Short Note about Naming
Cay Horstmann
cay.horstmann at gmail.com
Fri Nov 22 21:28:14 UTC 2019
Il 21/11/19 20:09, Brian Goetz ha scritto:
>
>> I agree that naming is important. Not sure "virtual" is a winner
>> because it has connotations of increased cost.
>
> ... though those costs are precisely analogous to the costs incurred by
> virtual threads. Mounting a virtual thread on, or dismounting from, a
> real thread requires work to copy stack frames, for example. These are
> a precise analog of building and tearing down page tables.
>
It's certainly a fair point to remind programmers that "fibers"/"virtual
threads" are not cost free.
When I talked to people about Loom, I didn't think they had a good frame
of reference when "fibers" would be beneficial. They tended to follow
"fiber = better thread", which didn't seem useful. I don't think
"virtual thread" would save that.
Perhaps a better angle would be to use a name that indicates why this
cost is worth incurring? You wouldn't want to pay for lots of OS threads
that are mostly blocking. But a "fiber" is parked when it executes a
blocking call, and we are happy to pay the price of copying stack frames
in return. Have you considered "BlockingTask" or "Blockable" or
"Parkable" or some such thing?
Cheers,
Cay
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