Are you sure about the JVM numbers? I would think that user + sys must always be < real (unless maybe the multiprocessor affects this - i.e. sums the processor time used on each).
-----Original Message----- From: Vic Bancroft [mailto:[EMAIL PROTECTED] Sent: Sunday, June 18, 2006 11:55 AM To: [EMAIL PROTECTED] Cc: java-dev@lucene.apache.org Subject: Re: Results (Re: Survey: Lucene and Java 1.4 vs. 1.5) 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, [EMAIL PROTECTED] 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, [EMAIL PROTECTED] lucene-415145]$ time build/indexFiles . 2>&1 > /dev/null real 0m22.932s user 0m16.581s sys 0m6.224s The virtual machine indexing, [EMAIL PROTECTED] 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 --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
