#!/bin/sh

# grep-2.17 would take nearly 200x longer to run the command below.

# The 200x is on an Intel i7-based system.

# On an AMD FX-4100, it would take up to 2500x longer.

# Copyright 2014-2017 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

. "${srcdir=.}/init.sh"; path_prepend_ ../src

fail=0

# This test is susceptible to failure due to differences in

# system load during the two test runs, so we'll mark it as

# "expensive", making it less likely to be run by regular users.

expensive_

# Make the input large enough so that even on high-end systems

# the unibyte test takes at least 10ms of user time.

n_lines=100000

while :; do

  yes $(printf '%078d' 0) | sed ${n_lines}q > in || framework_failure_

  ubyte_ms=$(LC_ALL=C user_time_ 1 grep -i foobar in) || fail=1

  test $ubyte_ms -ge 10 && break

  n_lines=$(expr $n_lines + 200000)

done

require_JP_EUC_locale_

mbyte_ms=$(user_time_ 1 grep -i foobar in) || fail=1

# The duration of the multi-byte run must be no more than 30 times

# that of the single-byte one.

# A multiple of 3 seems to be enough for i5,i7, but AMD needs >25.

returns_ 1 expr $ubyte_ms '<' $mbyte_ms / 30 || fail=1

Exit $fail