R Under development (unstable) (2023-12-04 r85659 ucrt) -- "Unsuffered Consequences"
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> require(data.table)
Loading required package: data.table
> test.data.table(script="nafill.Rraw")
getDTthreads(verbose=TRUE):
  OpenMP version (_OPENMP)       201511
  omp_get_num_procs()            48
  R_DATATABLE_NUM_PROCS_PERCENT  unset (default 50)
  R_DATATABLE_NUM_THREADS        unset
  R_DATATABLE_THROTTLE           unset (default 1024)
  omp_get_thread_limit()         2
  omp_get_max_threads()          48
  OMP_THREAD_LIMIT               2
  OMP_NUM_THREADS                unset
  RestoreAfterFork               true
  data.table is using 2 threads with throttle==1024. See ?setDTthreads.
test.data.table() running: D:/RCompile/CRANincoming/R-devel/lib/data.table/tests/nafill.Rraw.bz2 

Thu Dec  7 22:11:08 2023  endian==little, sizeof(long double)==16, longdouble.digits==64, sizeof(pointer)==8, TZ==unset, Sys.timezone()=='Europe/Berlin', Sys.getlocale()=='LC_COLLATE=C;LC_CTYPE=German_Germany.utf8;LC_MONETARY=C;LC_NUMERIC=C;LC_TIME=C', l10n_info()=='MBCS=TRUE; UTF-8=TRUE; Latin-1=FALSE; codepage=65001; system.codepage=65001', getDTthreads()=='OpenMP version (_OPENMP)==201511; omp_get_num_procs()==48; R_DATATABLE_NUM_PROCS_PERCENT==unset (default 50); R_DATATABLE_NUM_THREADS==unset; R_DATATABLE_THROTTLE==unset (default 1024); omp_get_thread_limit()==2; omp_get_max_threads()==48; OMP_THREAD_LIMIT==2; OMP_NUM_THREADS==unset; RestoreAfterFork==true; data.table is using 2 threads with throttle==1024. See ?setDTthreads.', zlibVersion()==1.3 ZLIB_VERSION==1.3
10 longest running tests took 0s (100%% of 0s)
   ID time nTest
1:  1 0.53    53
2:  3 0.01     7
3:  5 0.01     3
4:  2 0.00     8
5:  4 0.00    24
6:  6 0.00    24
7:  7 0.00    10
All 129 tests (last 7.1) in tests/nafill.Rraw.bz2 completed ok in 0.600s elapsed (0.520s cpu)
> 
> proc.time()
   user  system elapsed 
   0.67    0.12    0.81