i found

src/docs/invoking.md

and can view the python call graph, but i can't seem to figure out how to get a profile of the native engine stack. i'm trying (after killing pantsd):

valgrind --tool=callgrind -v --dump-every-bb=10000000 --trace-children=yes -- ./pants --glob-expansion-failure=ignore filedeps src/python/pants/util:objects

right now, but this errors out with:

Exception message: Build graph construction failed: ExecutionError Received unexpected Throw state(s):
Computing Select(Specs(dependencies=(SingleAddress(directory=u'src/python/pants/util', name=u'objects'),)), =TransitiveHydratedTargets)
  Computing Task(transitive_hydrated_targets, Specs(dependencies=(SingleAddress(directory=u'src/python/pants/util', name=u'objects'),)), =TransitiveHydratedTargets)
    Computing Task(addresses_from_address_families, Specs(dependencies=(SingleAddress(directory=u'src/python/pants/util', name=u'objects'),)), =BuildFileAddresses)
      Computing Snapshot(PathGlobs(include=(u'src/python/pants/util/BUILD.*', u'src/python/pants/util/BUILD'), exclude=(u'.*/', '/dist/', u'bower_components/', u'node_modules/', u'*.egg-info/')))
        Computing DigestFile(File { path: "src/python/pants/util/BUILD", is_executable: false })
          Throw(Error making env for store at "/home/cosmicexplorer/.cache/pants/lmdb_store/files/0": Invalid argument)
            Traceback (no traceback):
              <pants native internals>
            Exception: Error making env for store at "/home/cosmicexplorer/.cache/pants/lmdb_store/files/0": Invalid argument

is there a "normal" way to profile the native engine? i can't immediately interpret this error (working on it!)