On Wednesday 27 Jul 2011 22:10:44 Ximin Luo wrote:
> benefits of GNU BigInteger (from GNU classpath):
>
> - we don't need to maintain jbigi
> - we don't need to maintain jcpuid
> - jcpuid's per-cpu speed improvements are probably negligible anyway; the
> bigger speed increase is java->native, not native->native-special-for-your-cpu
> - GNU BigInteger is much faster than our jbigi implementation
>
> (we don't need to depend on the entirety of GNU classpath, we can just include
> the bits we need: https://bitbucket.org/dfdeshom/gmp-java)
>
> # on latest fred-staging:
> # assumes you are on debian, with gcj-4.6-jre-lib installed:
>
> $ git checkout bigint-gnu-gmp
> $ ant unit -Dtest.class=net.i2p.util.NativeBigIntegerTest
> -Dtest.benchmark=true
> [...]
> unit:
> [junit] Running net.i2p.util.NativeBigIntegerTest
> [junit] Testsuite: net.i2p.util.NativeBigIntegerTest
> [junit] Tests run: 2, Failures: 0, Errors: 0, Time elapsed: 26.878 sec
> [junit] Tests run: 2, Failures: 0, Errors: 0, Time elapsed: 26.878 sec
> [junit] ------------- Standard Output ---------------
> [junit] DEBUG: Warming up the random number generator...
> [junit] DEBUG: Random number generator warmed up
> [junit] INFO: 200 runs complete without any errors
> [junit] native run time: 4121ms (20ms each)
> [junit] java run time: 8465ms (42ms each)
> [junit] gnu run time: 1776ms (8ms each)
> [junit] native = 48.682811577082106% of pure java time
> [junit] gnu = 20.98050797401063% of pure java time
> [junit] DEBUG: Warming up the random number generator...
> [junit] DEBUG: Random number generator warmed up
> [junit] INFO: 200 runs complete without any errors
> [junit] native run time: 6254ms (31ms each)
> [junit] java run time: 3987ms (19ms each)
> [junit] gnu run time: 2190ms (10ms each)
> [junit] native = 156.85979433157763% of pure java time
> [junit] gnu = 54.92851768246802% of pure java time
> [junit] ------------- ---------------- ---------------
> [junit] ------------- Standard Error -----------------
> [junit] INFO: Optimized native BigInteger library
> 'net/i2p/util/libjbigi-linux-x86_64.so' loaded from resource
> [junit] ------------- ---------------- ---------------
> [junit]
> [junit] Testcase: testModPow took 14.436 sec
> [junit] Testcase: testDoubleValue took 12.438 sec
> [...]
>
>
> --
> GPG: 4096R/5FBBDBCE
> https://github.com/infinity0
> https://bitbucket.org/infinity0
> https://launchpad.net/~infinity0
>
Looks good to me. I assume it won't make the jar dramatically bigger?
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