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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug default/25951] support for parallel processing?
Date: Mon, 12 Apr 2021 08:22:20 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D25951

--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 13362
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D13362&action=3Ded=
it
Demonstator source file using seperate reaper/coordinator

(In reply to Tom de Vries from comment #6)
> Now -j works for multifile as well, provided -e and -p are used.

For the last step, to make multifile work with -j without -e/-p, the
communication scheme needs to be more elaborate.

The parent needs to both:
- reap the children
- communicate with the children about the multifile

It cannot do both tasks in blocking fashion. It could do them in a non-bloc=
king
fashion, but then you have busy wait, which is bad.

The solution I came up with is to have the parent spawn a seperate process,=
 the
coordinator.

Then the job of the parent is to reap children.

The job of the coordinator is to communicate with the children about the
multifile: the children request permission to contribute to the multifile, =
with
a certain type endian/pointer-size.  The coordinator replies back whether a=
nd
when that's ok.

When the parent reaps a child, it notifies the coordinator to ensure that t=
he
coordinator is not stuck on waiting for a request from that child.

--=20
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