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From Vic Bancroft <bancr...@america.net>
Subject Re: Results (Re: Survey: Lucene and Java 1.4 vs. 1.5)
Date Sun, 18 Jun 2006 16:55:16 GMT
Robert Engels wrote:

>Do you have any hard numbers to support this? The last time I checked, gcj
>had minimal improvement over JVM 1.5. 
>  
>
In terms of speed, there is not much difference between native code and 
classes (see sample timings).  However, the pragmatic availability of 
java 5 environment for even somewhat _exotic_ platforms is sadly 
limited.  My current environment is linux on a dual core x86_64. 

One can only ride a jrocket into 1.5 land and still address 64 bits of 
goodness !

more,
l8r,
v

BTW, given a native compile and link,

    [bancroft@orca lucene-415145]$ ldd  build/indexFiles
            libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x0000003f00400000)
            libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x0000003efec00000)
            libgcj.so.7 => /usr/lib64/libgcj.so.7 (0x00002aaaaaac2000)
            libm.so.6 => /lib64/libm.so.6 (0x0000003ef9100000)
            libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003efa500000)
            libz.so.1 => /usr/lib64/libz.so.1 (0x0000003ef9500000)
            libdl.so.2 => /lib64/libdl.so.2 (0x0000003ef9300000)
            libc.so.6 => /lib64/libc.so.6 (0x0000003ef8e00000)
            /lib64/ld-linux-x86-64.so.2 (0x0000003ef8c00000)

The native indexing,

[bancroft@orca lucene-415145]$ time build/indexFiles . 2>&1 > /dev/null

real    0m22.932s
user    0m16.581s
sys     0m6.224s

The virtual machine indexing,

[bancroft@orca lucene-415145]$ time java -d64 -Xmx8192m -cp build/lucene-demos-2.0-rc1-dev.jar:build/lucene-core-2.0-rc1-dev.jar
org.apache.lucene.demo.IndexFiles . 2>&1 > /dev/null
real    0m23.224s
user    0m33.238s
sys     0m5.184s
  

Side note, the jrocket seems to use both processors just about 1/3 of 
the way through, where as the gcj doesn't . . .

-- 
"The future is here. It's just not evenly distributed yet."
 -- William Gibson, quoted by Whitfield Diffie


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