private static int compress(PerformanceLogger logger, IntegerCODEC codec, int[] src, int[] dst) {
IntWrapper inpos = new IntWrapper();
IntWrapper outpos = new IntWrapper();
logger.compressionTimer.start();
codec.compress(src, inpos, src.length, dst, outpos);
logger.compressionTimer.end();
int outSize = outpos.get();
logger.addOriginalSize(src.length);
logger.addCompressedSize(outSize);
return outSize;
}
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));
}
}