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

From: Rob Browning
Subject: Re: Unexpectedly low read/write performance of open-pipe
Date: Sun, 21 Apr 2019 11:22:03 -0500

Mark H Weaver <address@hidden> 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.

Rob Browning
rlb and
GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A
GPG as of 2002-11-03 14DD 432F AE39 534D B592 F9A0 25C8 D377 8C7E 73A4

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