try to improve serialization test

4 jobs for misc_fixes in 5 minutes and 14 seconds (queued for 48 seconds)
Status Job ID Name Coverage
  Test
passed #165869
test_min

00:01:51

passed #165870
test_mpi

00:03:44

passed #165871
test_mpi_fftw

00:03:54

passed #165872
test_mpi_fftw_hdf5

00:05:08

57.0%