private static void checkArray(
int[] expected, int[] actualArray, int actualLen, IntegerCODEC codec) {
if (actualLen != expected.length) {
throw new RuntimeException(
"Length mismatch:"
+ " expected="
+ expected.length
+ " actual="
+ actualLen
+ " codec="
+ codec.toString());
}
for (int i = 0; i < expected.length; ++i) {
if (actualArray[i] != expected[i]) {
throw new RuntimeException(
"Value mismatch: "
+ " where="
+ i
+ " expected="
+ expected[i]
+ " actual="
+ actualArray[i]
+ " codec="
+ codec.toString());
}
}
}
private static void benchmark(
final PrintWriter csvWriter,
final String dataName,
final IntegerCODEC[] codecs,
final int[][] data,
final int repeat,
final int warmup) {
System.out.println("Processing: " + dataName);
for (IntegerCODEC codec : codecs) {
String codecName = codec.toString();
for (int i = 0; i < warmup; ++i) {
benchmark(null, null, null, codec, data, repeat);
}
benchmark(csvWriter, dataName, codecName, codec, data, repeat);
}
}
private static void bench(ArrayList<int[]> postings, CompressionMode cm, boolean verbose) {
int maxlength = 0;
for (int[] x : postings) if (maxlength < x.length) maxlength = x.length;
if (verbose) System.out.println("Max array length: " + maxlength);
int[] compbuffer = new int[2 * maxlength + 1024];
int[] decompbuffer = new int[maxlength];
if (verbose) System.out.println("Scheme -- bits/int -- speed (mis)");
for (IntegerCODEC c : (cm == CompressionMode.DELTA ? codecs : regcodecs)) {
long bef = 0;
long aft = 0;
long decomptime = 0;
long volumein = 0;
long volumeout = 0;
int[][] compdata = new int[postings.size()][];
for (int k = 0; k < postings.size(); ++k) {
int[] in = postings.get(k);
IntWrapper inpos = new IntWrapper(0);
IntWrapper outpos = new IntWrapper(0);
c.compress(in, inpos, in.length, compbuffer, outpos);
int clength = outpos.get();
inpos = new IntWrapper(0);
outpos = new IntWrapper(0);
c.uncompress(compbuffer, inpos, clength, decompbuffer, outpos);
volumein += in.length;
volumeout += clength;
if (outpos.get() != in.length) throw new RuntimeException("bug");
for (int z = 0; z < in.length; ++z)
if (in[z] != decompbuffer[z]) throw new RuntimeException("bug");
compdata[k] = Arrays.copyOf(compbuffer, clength);
}
bef = System.nanoTime();
for (int[] cin : compdata) {
IntWrapper inpos = new IntWrapper(0);
IntWrapper outpos = new IntWrapper(0);
c.uncompress(cin, inpos, cin.length, decompbuffer, outpos);
if (inpos.get() != cin.length) throw new RuntimeException("bug");
}
aft = System.nanoTime();
decomptime += (aft - bef);
double bitsPerInt = volumeout * 32.0 / volumein;
double decompressSpeed = volumein * 1000.0 / (decomptime);
if (verbose)
System.out.println(
c.toString() + "\t" + String.format("\t%1$.2f\t%2$.2f", bitsPerInt, decompressSpeed));
}
}