Created
May 21, 2010 02:48
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import java.util.*; | |
import it.unimi.dsi.fastutil.ints.IntOpenHashSet; | |
public class Stupid { | |
public static void run() { | |
for(int N = 32; N<=1048576;N*=2) { | |
int[] x = new int[N]; | |
Random rand = new Random(); | |
for(int k = 0;k < N; ++k) x[k]=rand.nextInt(); | |
Arrays.sort(x); | |
HashSet<Integer> hs = new HashSet<Integer>(); | |
for(int k = 0;k < N; ++k) hs.add(x[k]); | |
TreeSet<Integer> ts = new TreeSet<Integer>(); | |
for(int k = 0;k < N; ++k) ts.add(x[k]); | |
IntOpenHashSet ohs = new IntOpenHashSet(); | |
for(int k = 0; k < N; ++k) ohs.add(x[k]); | |
int howmanyqueries = 1000000; | |
int[] whichvalues = new int[howmanyqueries]; | |
for(int k = 0;k<howmanyqueries; ++k) | |
whichvalues[k] = rand.nextInt(); | |
long aft1 = System.currentTimeMillis(); | |
for(int t=1;t<10;++t) for(int wv : whichvalues) Arrays.binarySearch(x,wv); | |
long aft2 = System.currentTimeMillis(); | |
for(int t=1;t<10;++t) for(int wv : whichvalues) hs.contains(wv); | |
long aft3 = System.currentTimeMillis(); | |
for(int t=1;t<10;++t) for(int wv : whichvalues) ts.contains(wv); | |
long aft4 = System.currentTimeMillis(); | |
for(int t=1;t<10;++t) for(int wv : whichvalues) ohs.contains(wv); | |
long aft5 = System.currentTimeMillis(); | |
System.out.println(N+" "+(aft2-aft1)/(1000.0*howmanyqueries)+ " "+(aft3-aft2)/(1000.0*howmanyqueries)+ " "+(aft4-aft3)/(1000.0*howmanyqueries) + " "+(aft5-aft4)/(1000.0*howmanyqueries)); | |
} | |
} | |
public static void main(String [] a) { | |
run(); | |
} | |
} | |
/* | |
* 32 2.66E-7 3.62E-7 4.68E-7 2.71E-7 | |
64 3.55E-7 3.77E-7 6.01E-7 3.29E-7 | |
128 4.31E-7 3.83E-7 6.7E-7 2.83E-7 | |
256 4.67E-7 3.63E-7 7.25E-7 2.96E-7 | |
512 5.6E-7 4.05E-7 8.38E-7 2.66E-7 | |
1024 5.79E-7 3.76E-7 9.37E-7 2.63E-7 | |
2048 6.31E-7 3.8E-7 1.049E-6 2.62E-7 | |
4096 6.71E-7 4.99E-7 1.418E-6 3.03E-7 | |
8192 8.06E-7 4.53E-7 1.609E-6 2.65E-7 | |
16384 8.12E-7 4.81E-7 1.913E-6 2.79E-7 | |
32768 9.14E-7 6.43E-7 2.541E-6 2.85E-7 | |
65536 1.025E-6 9.12E-7 4.414E-6 3.06E-7 | |
131072 1.497E-6 1.362E-6 6.515E-6 3.4E-7 | |
262144 1.703E-6 1.727E-6 8.585E-6 3.67E-7 | |
524288 2.155E-6 1.828E-6 1.0578E-5 5.51E-7 | |
1048576 2.867E-6 1.998E-6 1.2602E-5 7.88E-7 | |
*/ |
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