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From: "woodard at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: elfutils-devel@sourceware.org
Subject: [Bug libdw/22252] New: Parallel parsing of CU's DIEs from libdw
Date: Wed, 04 Oct 2017 18:23:00 -0000
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X-Bugzilla-Product: elfutils
X-Bugzilla-Component: libdw
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X-Bugzilla-Who: woodard at redhat dot com
X-Bugzilla-Status: NEW
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D22252

            Bug ID: 22252
           Summary: Parallel parsing of CU's DIEs from libdw
           Product: elfutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libdw
          Assignee: unassigned at sourceware dot org
          Reporter: woodard at redhat dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

To speed up the processing of large ELF files which are common in HPC please
resolve the data races which prevent parallel parsing of CU's DIEs within E=
LF
files. We'd like to do something like:

 for(Dwarf_Off cu_off =3D 0;
            dwarf_next_unit(dbg(), cu_off, &next_cu_header, &cu_header_leng=
th,
                NULL, &abbrev_offset, &addr_size, &offset_size,
                &type_signaturep, NULL) =3D=3D 0;
            cu_off =3D next_cu_header)
    {
        if(!dwarf_offdie_types(dbg(), cu_off + cu_header_length,
&current_cu_die))
            continue;
// Modified for parallelism: rather than a single DwarfWalker holding state,
// create a new context and clone before we spawn a thread
        push();
        DwarfWalker mod_walker(*this);
        pop();
        bool ret =3D cilk_spawn mod_walker.parseModule(false, fixUnknownMod=
);
//        bool ret =3D parseModule(false, fixUnknownMod);
        if(!ret) {
            cilk_sync;
            return false;
        }
        compile_offset =3D next_cu_header;
    }
    cilk_sync;

Code similar to this is being worked on for dyninst http://www.dyninst.org/

--=20
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