Measuring performance changes from applying 4837946 patch (original) (raw)
Brian Burkhalter brian.burkhalter at oracle.com
Tue Jun 4 17:44:39 UTC 2013
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Hi Sergey,
On Jun 4, 2013, at 6:49 AM, Sergey Kuksenko wrote:
could you show your benchmark?
Please see code below.
My quick experiments show that current Karatsuba threshold is quite reasonable.
I hope that you are correct. I would like to know why I am seeing such different numbers.
Thanks,
Brian
/**
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- DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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- the terms of the GNU General Public License version 2 only, as published by
- the Free Software Foundation. Oracle designates this particular file as
- subject to the "Classpath" exception as provided by Oracle in the LICENSE
- file that accompanied this code.
- This code is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- A PARTICULAR PURPOSE. See the GNU General Public License version 2 for more
- details (a copy is included in the LICENSE file that accompanied this code).
- You should have received a copy of the GNU General Public License version 2
- along with this work; if not, write to the Free Software Foundation, Inc., 51
- Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA or
- visit www.oracle.com if you need additional information or have any
- questions. */ package corelibs;
import java.math.BigInteger; import java.util.Random; import java.util.concurrent.TimeUnit; import org.openjdk.jmh.annotations.BenchmarkType; import org.openjdk.jmh.annotations.GenerateMicroBenchmark; import org.openjdk.jmh.annotations.OutputTimeUnit; import org.openjdk.jmh.annotations.Scope; import org.openjdk.jmh.annotations.State;
public class BigIntegerBench {
static final int BITS_KARATSUBA = 1600;
static final int BITS_TOOM_COOK = 2400;
static final int BITS_KARATSUBA_SQUARE = 2880;
static final int BITS_TOOM_COOK_SQUARE = 4480;
static final int BITS_GENERIC = 1600;
@State(Scope.Benchmark)
public static class BenchmarkState {
Random random = new Random(42L);
BigInteger genericFactor1 = new BigInteger(BITS_GENERIC + 1, random);
BigInteger genericFactor2 = new BigInteger(BITS_GENERIC + 400, random);
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@GenerateMicroBenchmark(BenchmarkType.AverageTimePerOp)
public BigInteger multiplyStandardGeneric(BenchmarkState state) {
return state.genericFactor1.multiply_standard(state.genericFactor2);
}
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@GenerateMicroBenchmark(BenchmarkType.AverageTimePerOp)
public BigInteger multiplyKaratsubaGeneric(BenchmarkState state) {
return state.genericFactor1.multiply_karatsuba(state.genericFactor2);
}
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@GenerateMicroBenchmark(BenchmarkType.AverageTimePerOp)
public BigInteger multiplyToomCookGeneric(BenchmarkState state) {
return state.genericFactor1.multiply_toom_cook(state.genericFactor2);
}}
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