test_node: get_mem_rss fixups #14693

 138 | +        # Catching to avoid failing on platforms where ps
 139 | +        # isn't installed (SubprocessError) or doesn't work as expected (ValueError), e.g. BSD.
 140 |          #
 141 |          # We could later use something like `psutils` to work across platforms.
 142 | -        except Exception:
 143 | +        except (subprocess.SubprocessError, ValueError):

jamesob commented at 10:48 PM on November 8, 2018:

We could also try detecting/parsing the *BSD-style output, which looks like "RSS\n 123".