Java Example & Benchmark

2015-06-16 17:05:37 +02:00
parent da864fd454
commit ab34f7ae02
1 changed files with 85 additions and 0 deletions
--- a/java/jicbench.java
+++ b/java/jicbench.java
@ -0,0 +1,85 @@
+/**
+    Copyright (C) powturbo 2013-2015
+    GPL v2 License
+  
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program 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 for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+    - homepage : https://sites.google.com/site/powturbo/
+    - github   : https://github.com/powturbo
+    - twitter  : https://twitter.com/powturbo
+    - email    : powturbo [_AT_] gmail [_DOT_] com
+**/
+//     icbench - "Integer Compression" Java Critical Native Interface
+
+/* Usage: (actually no makefile available)
+1 - generate header jic.h
+$ javah -jni jic
+
+2 - Compile jic and jicbench
+$ javac jic.java
+$ javac jicbench.java
+
+3 - compile & link a shared library
+$ gcc -O3 -march=native -fstrict-aliasing -m64 -shared -fPIC -I/usr/lib/jvm/java-7-openjdk-amd64/include bitpack.c bitunpack.c bitpackv.c bitunpackv.c vp4dc.c vp4dd.c vsimple.c vint.c bitutil.c jic.c -o libic.so
+
+4 - copy "libic.so" to java library directory
+
+5 - start icbench
+$java icbench
+*/
+
+class jicbench {
+  // Note: this is a simple interface test not a real benchmark 
+
+  public static void main(String args[]) {
+    jic ic = new jic();
+    final  int[]  in = new  int[256];
+    final byte[] out = new byte[256*5];
+    final  int[] cpy = new  int[256];
+
+    for (int i = 0; i < 128; ++i) { 
+      in[i] = i;
+      cpy[i] = 0;
+    }
+    long t0 = System.currentTimeMillis();		 
+    int b=0, bnum = 125000000; // 16 billions integers. 64 GB
+    for (int i = 0; i < bnum; ++i) { 
+      //ic.vbenc32(in,  128, out);				 
+      //ic.vbennc32(in, 128, out);
+
+      b = ic.bit32(in, 128);
+      ic.bitpackv32(  in, 128, out, b);
+    }
+
+    long t = System.currentTimeMillis() - t0;    
+    System.out.println("encode time'" + t + "'");
+    t0 = System.currentTimeMillis();	
+    for (int i = 0; i < bnum; ++i) { 
+      //ic.vbenc32(out,  128, cpy);				 
+      //ic.vsenc32(out, 128, cpy);
+
+      ic.bitunpackv32(out, 128, cpy, b);
+    }
+
+    for (int i = 0; i < 128; ++i) { 
+      if(in[i] != cpy[i]) {
+        System.err.println("Error at'" + i + "'");
+        System.exit(1);
+      }
+    }
+    t = System.currentTimeMillis() - t0;
+    System.out.println("decode time'" + t + "'");
+  }
+}