message: rocfft-perf: ensure header and linebreaks are in .dat files
diff: @@ -66,11 +66,13 @@ def write_tsv(path, records, meta={}, overwrite=False):
  with open(path, 'a') as f:
  if overwrite:
  f.truncate(0)
  + if f.tell() == 0:
  if meta is not None:
  for k, v in meta.items():
  dat.append(f'# {k}: {v}')
  dat += [tjoin([str(x) for x in r]) for r in records]
  f.write(njoin(dat))
  + f.write('\n')
  #
  