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# wall-clock time drops.  That makes the c_openmp variant look
# *slower* than c_serial in cmpthese output -- the opposite of what
# a user actually experiences.
#
# This module replaces it with three Time::HiRes-based helpers, used
# across every bench script in this directory so they share a single
# timing path:
#
#   wall_cmpthese($target_secs, \%vars)
#       cmpthese-style comparison table, sorted slowest -> fastest with
#       a pairwise percent-difference matrix.  Prints only; returns
#       nothing.  Used when comparing several alternatives at once.
#
#   wall_rate($code, $secs)
#       Warm up briefly, then time $code for $secs wall-clock seconds.
#       Returns ops/second as a scalar.  Used when the script formats
#       its own table (e.g. bench-sklearn-scoring's side-by-side
#       Perl-vs-sklearn rows).
#
#   wall_time_median($code, $reps)
#       Run $code once as a warm-up, then time exactly $reps invocations