From: nobu@...
Date: 2015-03-05T03:02:36+00:00
Subject: [ruby-core:68420] [Ruby trunk - Bug #10931]	[PERF]bm_app_mandelbrot.rb 20% slower.

Issue #10931 has been updated by Nobuyoshi Nakada.


On MacBook Pro late 2013, OSX 10.10.2, 2.6GHz 16GiB.
At a git-svn working directory, (`$build` is the build directory):

~~~
$ execs=; for c in `git log --since=2015/2/1 --format=%H --reverse -- complex.c`; do v=`git log -1 $c | sed '/git-svn-id:/!d;s/.*@//;s/ .*//'`; git co $c -- complex.c numeric.c && echo $'#define RUBY_REVISION '$v$'\n#define RUBY_BRANCH_NAME "bm_complex"' > revision.h && rm -f $build/{complex,numeric,version}.o && make -C $build EXEEXT=-$v mini && execs="${execs};r$v::$build/miniruby-$v"; done && ruby benchmark/driver.rb -fm -e "${execs}" -p mandel 
~~~

-----------------------------------------------------------
benchmark results:
Execution time (sec)

name          |r49723 |r49724 |r49732 |r49743 |r49754 |r49757
--------------|------:|------:|------:|------:|------:|------:
app_mandelbrot|  0.982|  0.959|  1.004|  0.988|  1.092|  1.150
so_mandelbrot |  1.750|  1.750|  1.739|  1.823|  1.729|  1.725

Speedup ratio: compare with the result of `r49723' (greater is better)

name          |r49724 |r49732 |r49743 |r49754 |r49757
--------------|------:|------:|------:|------:|------:
app_mandelbrot|  1.024|  0.978|  0.994|  0.899|  0.854
so_mandelbrot |  1.000|  1.006|  0.960|  1.012|  1.015

Log file: bmlog-20150305-115133.69279.md



----------------------------------------
Bug #10931: [PERF]bm_app_mandelbrot.rb 20% slower.
https://bugs.ruby-lang.org/issues/10931#change-51767

* Author: Guo Xiang Tan
* Status: Open
* Priority: Normal
* Assignee: Nobuyoshi Nakada
* ruby -v: ruby 2.3.0dev
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
http://rubybench.org/ruby/ruby/commits?result_type=app_mandelbrot

Relevant Commits: 
https://github.com/ruby/ruby/commit/909c4c0
https://github.com/ruby/ruby/commit/41b2f1a

Before:               0.786s
After Commit 909c4c0: 0.856s
After Commit 41b2f1a: 0.923s

Just want to raise awareness on this. Feel free to close this issue if the performance trade-offs were intended. Let me know if more information is required. Thank you!




-- 
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