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Parallelize dwarfdump per-unit #285

Merged
merged 1 commit into from
Mar 12, 2018
Merged

Parallelize dwarfdump per-unit #285

merged 1 commit into from
Mar 12, 2018

Commits on Mar 12, 2018

  1. Parallelize dwarfdump per-unit 

    Before:

time ( target/release/examples/dwarfdump -i ~/mozilla-central/obj-ff-opt/dist/bin/libxul.so >& /dev/null )
real    1m39.153s
user    1m37.714s
sys     0m1.320s

After:

time ( target/release/examples/dwarfdump -i ~/mozilla-central/obj-ff-opt/dist/bin/libxul.so >& /dev/null )
real	0m25.641s
user	2m3.328s
sys	0m1.087s

This increases memory usage. We buffer the output; the max memory usage increases by around the size of the
N largest outputs per compilation unit, where N is the min of 16 and num_cpus::get(). The larger compilation
units in Firefox libxul.so produce tens to hundreds of megabytes of output each. Then again, the speedup
processing such large files is important.
    @rocallahan
    rocallahan committed Mar 12, 2018
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