Progress #

Emit progress to stdout (default) or a .progress log file, if output_infix is set. (filename is {output_prefix}{ix_separator}{infix}.progress, default separator _).

[[step]]
   action = "Progress"
   n = 100_000
   output_infix = "progress" # optional

Every n reads, report on total progress, total reads per second. At the end, report final runtime and reads/second.