зеркало из https://github.com/mozilla/pjs.git
a3b59239d5
Rhino: speed optimization in omj/Interpreter.java
Date:
Tue, 26 Jun 2001 21:06:56 +0200
From:
Igor Bukanov <igor@icesoft.no>
Organization:
Wind River
To:
Norris Boyd <nboyd@atg.com>
Hi, Norris!
The attached Interpreter_patch contains a speed optimization patch that
tries to avoid creation of Double objects by keeping a parallel stack
for double values: instead of putting Double to the stack, DBL_MRK is
put and the real value is put to double stack (sDbl). Then when reading
stack with DBL_MRK, the double value from the double stack is used
wrapped to Double object when necessary. In addition local and vars
arrays are merged to stack array.
The attached before.txt and after.txt contain results of typical runs of
mozilla/js/benchmarks/all_bench.js before and after optimization on my
PC: Athlon 650/Red Hat 7.0/JDK 1.3.0 from Sun .
In number of cases the optimization actually slow down the executionby
5-10% (I guess due to the checks for DBL_MRK), but mostly it is a nice
sped up often by factor of 2 ot more with overall optimization win: 267
versus 218 seconds.
I guess it is possible to apply the same optimization to the optimizer
package, but in our browser we use strictly interpreter mode. Also by
changing signature of call/construct methods in Scriptable it is
possible to avoid creation of almost all objects currently allocated
during method calls, but that is for far future.
Regards, Igor
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| .. | ||
| docs | ||
| examples | ||
| macbuild | ||
| src | ||
| toolsrc | ||
| Makefile | ||
| README.html | ||
| apiClasses.properties | ||
| build-date | ||
| build.xml | ||
README.html
<html> <!-- - The contents of this file are subject to the Netscape Public - License Version 1.1 (the "License"); you may not use this file - except in compliance with the License. You may obtain a copy of - the License at http://www.mozilla.org/NPL/ - - Software distributed under the License is distributed on an "AS - IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or - implied. See the License for the specific language governing - rights and limitations under the License. - - The Original Code is Rhino code, released - May 6, 1999. - - The Initial Developer of the Original Code is Netscape - Communications Corporation. Portions created by Netscape are - Copyright (C) 1998-1999 Netscape Communications Corporation. All - Rights Reserved. - - Contributor(s): - Norris Boyd - - Alternatively, the contents of this file may be used under the - terms of the GNU Public License (the "GPL"), in which case the - provisions of the GPL are applicable instead of those above. - If you wish to allow use of your version of this file only - under the terms of the GPL and not to allow others to use your - version of this file under the NPL, indicate your decision by - deleting the provisions above and replace them with the notice - and other provisions required by the GPL. If you do not delete - the provisions above, a recipient may use your version of this - file under either the NPL or the GPL. --> <body> <h1> <span CLASS=LXRSHORTDESC> Rhino: JavaScript in Java<p> </span> </h1> <span CLASS=LXRLONGDESC> Rhino is an implementation of JavaScript in Java. Documentation can be found <a href="http://www.mozilla.org/js/rhino/rhino.html">here</a>. </span> </body> </html>