bison

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Akim Demaille 9c21da3363 bench: add support to randomize the order of execution

It's amazing how much the order matters.  To a point that many of
these benches are meaningless.  For instance (some of the benches
where run with `make -C benches/latest rand
BENCHFLAGS=--benchmark_min_time=3`):

    compiler: g++ -std=c++11 -O2
      0. %define nofinal
      1.
    --------------------------------------------------
    Benchmark           Time           CPU Iterations
    --------------------------------------------------
    BM_y0            1543 ns       1541 ns     441660
    BM_y1            1521 ns       1520 ns     456535
    --------------------------------------------------
    BM_y0            1531 ns       1530 ns     440584
    BM_y1            1512 ns       1511 ns     457591
    --------------------------------------------------
    BM_y0            1539 ns       1538 ns    2749330
    BM_y1            1516 ns       1515 ns    2771500
    --------------------------------------------------
    BM_y0            1571 ns       1570 ns    2600782
    BM_y1            1542 ns       1541 ns    2708349
    --------------------------------------------------
    BM_y0            1530 ns       1529 ns    2670363
    BM_y1            1519 ns       1518 ns    2764096

    --------------------------------------------------
    Benchmark           Time           CPU Iterations
    --------------------------------------------------
    BM_y1            1529 ns       1528 ns     451937
    BM_y0            1508 ns       1507 ns     453944
    --------------------------------------------------
    BM_y1            1525 ns       1524 ns    2750684
    BM_y0            1516 ns       1515 ns    2794034
    --------------------------------------------------
    BM_y1            1526 ns       1525 ns    2749620
    BM_y0            1515 ns       1514 ns    2808112
    --------------------------------------------------
    BM_y1            1524 ns       1523 ns    4475844
    BM_y0            1502 ns       1501 ns    4611665

* etc/bench.pl.in: here.

2020-05-10 11:51:46 +02:00

.gitignore

Update ignores.

2008-11-16 19:46:16 +01:00

bench.pl.in

bench: add support to randomize the order of execution

2020-05-10 11:51:46 +02:00

local.mk

package: bump copyrights to 2020

2020-01-05 10:26:35 +01:00

README

package: bump copyrights to 2020

2020-01-05 10:26:35 +01:00

README

* bench.pl
A primitive Perl script to run benches.  Currently its only bench is
the usual calculator: it has a lightweight processing part (but not
null), so it is really emphasizing the cost of the whole parsing
(including scanning and I/O).

Set the envvars BISON and CC to the programs and flags you want to
use.  They default to bison and gcc.  To run a non-installed bison
from a tarball built in _build, I suggest the following.

     BISON=_build/tests/bison CC='gcc -O2' ./bench.pl

(The _build/tests/bison wrapper makes sure that _build/src/bison will
use the tarballs' skeletons, not those already installed as a
straightforward use of _build/src/bison would.)

--

Copyright (C) 2006, 2009-2015, 2018-2020 Free Software Foundation, Inc.

This file is part of Bison, the GNU Compiler Compiler.

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/>.

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