Re: Unexpectedly low read/write performance of open-pipe

[Rob Browning <rlb@defaultvalue.org>]

Mark H Weaver <mhw@netris.org> writes:

> I've attached four patches.  Only the first two should be needed for
> what I have described above.
>
> The last two patches will only be of interest if you need suspendable
> I/O.  They add suspendable I/O support for custom binary ports, and in
> particular for these OPEN_BOTH pipe ports.
>
> Note that I've not yet done much testing of these patches, besides
> running the Guile test suite.

Here for "guile -s io-perf.scm > /dev/null" I see:

  2.2.4:                  1.39 mb/s  >100% CPU in top
  your first proposal: 1453.49 mb/s  >300% CPU in top
  this series:         3937.01 mb/s   <80% CPU in top

(and most importantly for this series, a much quieter fan...)

And yes, I'd love to see something like this in 2.2 too if it turns out
to be feasible to include it there.

Nice
-- 
Rob Browning
rlb @defaultvalue.org and @debian.org
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