[antlr-interest] Re: Got GCJ to compile antlr and java parser/tree parser :)

[Oliver Zeigermann]

Great! Congratulations!

I have heard JDK 1.4 still needs quite some time and resources for
startup (even though improved over 1.3). This may be the reason for
the small example to be faster with GCJ. I have also head, Sun will
further improve startup time in 1.5.

:)

Oliver

--- In antlr-interest at yahoogroups.com, Terence Parr <parrt at a...> wrote:
> Ok, it was a pain in the ass, but with the knowledge that Ric Klaren 
> had gotten antlr to compile, I spent a few hours today trying things 
> out myself.
> 
> First, get ANTLR to compile.  Got it to compile out of the box:
> 
> for each package dir in antlr:
> 
> $ gcj --CLASSPATH=/home/parrt/org.antlr -c -g -O *.java
> 
> then link:
> 
> gcj -o /usr/local/bin/antlr --main=antlr.Tool -g *.o */*.o */*/*.o
> 
> After running strip on executable, it's like 1.3M. :)  Nice.
> 
> Getting antlr to run over a .g file is now easy:
> 
> $ antlr file.g
> 
> Hooray!  Now, to compile the resulting parser took me a while to get 
> working.
> 
> I tried to make a library and all that, but couldn't make it work so I 
> resorted to telling it to compile antlr each time along with the parser 
> from file.g.  No biggie.
> 
> GCJ does not have swing so I had to yank out anything related to that 
> like debug/misc/ASTFrame.* etc...  Then I jar'd it up (put in 
> /tmp/antlr.jar) and then did this:
> 
> $ antlr java.g
> $ antlr java.tree.g
> $ gcj -c -g -O --classpath=/tmp/antlr.jar:. *.java
> $ gcj -o jparse --main=Main -g *.o /tmp/antlr.jar
> 
> Lots of things like this come out:
> 
> warning: exception handler inside code that is being protected
> 
> but I ignored it and gave it the old smoke test.
> 
> ENVIRONMENT
> 
> My test box is a dual 1Ghz linux 9.x (can't remember which) with 1G RAM.
> 
> $ cat /proc/version
> Linux version 2.4.20-6smp (bhcompile at p...) (gcc 
> version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)) #1 SMP Thu Feb 27 
> 09:59:40 EST 2003
> 
> $ gcj --version
> gcj (GCC) 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
> 
> TIMING
> 
> Java VM parsing jdk 1.4 source using time program:
> 
> $ java Main /usr/local/java/java
> real    0m28.868s
> user    0m24.990s
> sys     0m0.420s
> 
> GCJ compiled parser doing same thing:
> 
> $ ./jparse /usr/local/java/java
> real    0m40.004s
> user    0m38.870s
> sys     0m0.470s
> 
> [Note there are some problems parsing the source, but I haven't checked 
> what the error in my grammar is]
> 
> Yes, the GCJ version is SLOWER!  Could this be the garbage collector or 
> slow IO library or something?
> 
> Ok, let's try on something smaller.  How about the antlr source.
> 
> $ time java Main /home/parrt/org.antlr/antlr
> real    0m7.226s
> user    0m4.750s
> sys     0m0.090s
> 
> $ time ./jparse /home/parrt/org.antlr/antlr
> real    0m5.794s
> user    0m5.700s
> sys     0m0.080s
> 
> In this case, GCJ wins.
> 
> When parsing 1.4 source, GCJ version needs 10M resident and java VM 
> version needs 25M.
> 
> Well, that's all I have to report at the moment.  Can anybody comment, 
> speculate?
> 
> Terence
> --
> Professor Comp. Sci., University of San Francisco
> Creator, ANTLR Parser Generator, http://www.antlr.org
> Co-founder, http://www.jguru.com
> Co-founder, http://www.knowspam.net enjoy email again!
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