fs1.followRenames(true);
fs2.followRenames(true);
Nodeid cset = hgRepo.getChangelog().getRevision(2);
Path fname = Path.create("dir9/file9"); // close to the manifest end
fs1.changeset(cset);
fs2.changeset(cset);
// hgRepo.getManifest().getFileRevision(TIP, fname);
final long start1 = System.nanoTime();
boolean e1 = fs1.checkExists(fname);
final long end1 = System.nanoTime();
boolean e2 = fs2.checkExists(fname);