for ( final int position : MathUtils.log10LinearRange(0, vc.getNSamples(), 0.1) ) {
final VariantContextBuilder vcb = new VariantContextBuilder(vc);
final List<Genotype> genotypes = new ArrayList<Genotype>(vc.getGenotypes());
Collections.rotate(genotypes, position);
vcb.genotypes(genotypes);
timer.start();
final AFCalculationResult resultTracker = calc.getLog10PNonRef(vcb.make(), HomoSapiensConstants.DEFAULT_PLOIDY, testBuilder.numAltAlleles, priors);
final long runtime = timer.getElapsedTimeNano();