Usage:
  -h [ --help ]                         : produce help message
  ----pool <POOL> --chunk-pool <POOL>   : perform deduplication on the target
                                        pool

Opational arguments:
  --chunk-size arg                      : chunk size (byte)
  --chunk-algorithm arg                 : <fixed|fastcdc>, set chunk-algorithm
  --fingerprint-algorithm arg           : <sha1|sha256|sha512>, set
                                        fingerprint-algorithm
  --chunk-pool arg                      : set chunk pool name
  --max-thread arg                      : set max thread
  --report-period arg                   : set report-period
  --pool arg                            : set pool name
  --snap                                : deduplciate snapshotted object
  --chunk-dedup-threshold arg           : set the threshold for chunk dedup
                                        (number of duplication)
  --sampling-ratio arg                  : set the sampling ratio (percentile)
  --wakeup-period arg                   : set the wakeup period of crawler
                                        thread (sec)
  --fpstore-threshold arg (=104857600)  : set max size of in-memory fingerprint
                                        store (bytes)
  --run-once                            : do a single iteration for debug