test case, whole file

cp-inplace over nfs
    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time ( cp-inplace.py /tv/tmp.ts /d/tmp.ts ; sync )
# real    2m14.328s
# user    0m0.020s
# sys     0m9.965s

dd over nfs

    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time ( dd if=/tv/tmp.ts of=/d/tmp.ts ; sync )
# real    2m4.051s
# user    0m2.160s
# sys     0m19.825s

cp over nfs

    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time ( cp /tv/tmp.ts /d/tmp.ts ; sync )
# real    2m2.805s
# user    0m0.076s
# sys     0m7.136s

scp
    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time ( scp tv:/tv/tmp.ts /d/tmp.ts ; sync )
# real    2m4.298s
# user    0m21.957s
# sys     0m22.285s

rsync rsync://
    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time ( rsync -a rsync://tv/tv/tmp.ts /d/tmp.ts ; sync )
# real    2m2.962s
# user    0m6.940s
# sys     0m15.509s

rsync --inplace rsync://
    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time ( rsync -a --inplace rsync://tv/tv/tmp.ts /d/tmp.ts ; sync )
# real    2m2.846s
# user    0m6.732s
# sys     0m15.929s

rsync --append rsync://
    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time ( rsync -a --append rsync://tv/tv/tmp.ts /d/tmp.ts ; sync )
# real    2m2.974s
# user    0m7.048s
# sys     0m15.833s




test case, half file already copied

cp-inplace over nfs
    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm -f /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time dd if=/tv/tmp.ts of=/d/tmp.ts bs=1024 count=697080 ; \
    time ( cp-inplace.py /tv/tmp.ts /d/tmp.ts ; sync )
# real    1m6.393s
# user    0m0.020s
# sys     0m5.104s

dd over nfs
    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm -f /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time dd if=/tv/tmp.ts of=/d/tmp.ts bs=1024 count=697080 ; \
    time ( dd if=/tv/tmp.ts of=/d/tmp.ts bs=1024 skip=697080 seek=697080; sync )
# real    1m2.530s
# user    0m0.508s
# sys     0m6.600s

cp over nfs
    # no support per man
    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm -f /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time dd if=/tv/tmp.ts of=/d/tmp.ts bs=1024 count=697080 ; \
    time ( cp /tv/tmp.ts /d/tmp.ts ; sync )
# real    2m3.256s
# user    0m0.064s
# sys     0m7.348s

scp
    # no support per man
    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm -f /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time dd if=/tv/tmp.ts of=/d/tmp.ts bs=1024 count=697080 ; \
    time ( scp /tv/tmp.ts /d/tmp.ts ; sync )
# real    2m3.443s
# user    0m0.032s
# sys     0m7.420s

rsync rsync://
    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm -f /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time dd if=/tv/tmp.ts of=/d/tmp.ts bs=1024 count=697080 ; \
    time ( rsync --archive rsync://tv/tv/tmp.ts /d/tmp.ts ; sync )
# real    4m18.850s
# user    0m8.801s
# sys     0m13.289s

rsync --inplace rsync://
    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm -f /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time dd if=/tv/tmp.ts of=/d/tmp.ts bs=1024 count=697080 ; \
    time ( rsync --archive --inplace rsync://tv/tv/tmp.ts /d/tmp.ts ; sync )
# real    4m17.213s
# user    0m8.513s
# sys     0m9.849s

rsync --append rsync://
    ssh root@tv "sync ; echo 3 > /proc/sys/vm/drop_caches" ; \
    rm -f /d/tmp.ts ; sync ; echo 3 > /proc/sys/vm/drop_caches ; \
    time dd if=/tv/tmp.ts of=/d/tmp.ts bs=1024 count=697080 ; \
    time ( rsync --archive --append rsync://tv/tv/tmp.ts /d/tmp.ts ; sync )
# real    1m28.632s
# user    0m5.308s
# sys     0m8.737s

# the only rsync that didn't go slow on the net transfer,
# but it did read the output file to checksum.