add a little bit of parallelism to pfs test
add a little bit of parallelism to pfs test

phacops/pachyderm,phacops/pachyderm,wideioltd/pachyderm,alexdebrie/pachyderm,klucar/pachyderm,kunthar/pachyderm,henrylee2cn/pachyderm,ShengjieLuo/pachyderm,ShengjieLuo/pachyderm,sambooo/pachyderm,henrylee2cn/pachyderm,klucar/pachyderm,alexdebrie/pachyderm,ShengjieLuo/pachyderm,sambooo/pachyderm,wideioltd/pachyderm,alexdebrie/pachyderm,kunthar/pachyderm,sambooo/pachyderm,klucar/pachyderm