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From: "tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug symtab/29959] New: Investigate parallel reader scalability
Date: Tue, 03 Jan 2023 14:04:10 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29959

            Bug ID: 29959
           Summary: Investigate parallel reader scalability
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

Created attachment 14548
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D14548&action=3Ded=
it
screen shot from gnuplot

I was curious about the scalability of the parallel reader,
so I built on gcc112, which reports 160 processors.

I made a file like:

maint time 1
file /tmp/gdb

Then I ran:

for j in $(seq 0 180); do echo =3D=3D=3D=3D=3D=3D=3D $j ; ./gdb/gdb -nh -qu=
iet -iex "maint
set worker-threads $j" < S; done

I had it go over 160 just to see if that was interesting or not.

To my surprise, the results don't seem to improve past N=3D8 or so.
There are multiple possible explanations for this, but it would
be worthwhile to find out exactly why.

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