That's pretty awesome, are you going to make it available? or push it upstream?
If not... how can we get it? On Tue, Oct 1, 2019 at 1:09 AM Bill Wichser <b...@princeton.edu> wrote: > Just wanted to circle back on my orginal question. I changed the rsync > code adding xxhash and we see about a 3x speedup. Good enough since it > is very close to not using any checksum speedups. > > Bill > > On 6/17/19 9:43 AM, Bill Wichser wrote: > > We have moved to a rsync disk backup system, from TSM tape, in order to > > have a DR for our 10 PB GPFS filesystem. We looked at a lot of options > > but here we are. > > > > md5 checksums take a lot of compute time with huge files and even with > > millions of smaller ones. The bulk of the time for running rsync is > > spent in computing the source and destination checksums and we'd like to > > alleviate that pain of a cryptographic algorithm. > > > > Googling around, I found no mention of using a technique like this to > > improve rsync performance. I did find reference to a few hashing > > algorithms though which could certainly work here (xxhash, murmurhash, > > sbox, cityhash64). > > > > Rsync has certainly been around for a few years! We are going to pursue > > changing the current checksum algorithm and using something much faster. > > If anyone has done this already and would like to share their > > experiences that would be wonderful. Ideally this could be some optional > > plugin for rsync where users could choose which checksummer to use. > > > > Bill > > _______________________________________________ > > Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing > > To change your subscription (digest mode or unsubscribe) visit > > https://beowulf.org/cgi-bin/mailman/listinfo/beowulf > _______________________________________________ > Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing > To change your subscription (digest mode or unsubscribe) visit > https://beowulf.org/cgi-bin/mailman/listinfo/beowulf > -- Dr Stuart Midgley sdm...@gmail.com
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