On Monday 27 December 2004 16:50, Horst Birthelmer wrote: > On Dec 27, 2004, at 3:48 PM, Andrej Filipcic wrote: > > Hi, > > > > I have checked diskcache/memcache performance over an ADSL link. > > The link has 4M download and 512k upload bandwidth. Although there are > > still > > problems with disk cache, the copy from afs to local disk is good > > enough. > > With disk cache the speed is ~400 kbyte/s (tcp speed is 500 kbyte/s). > > Memcahe speed is much lower, between 120 and 160 kbyte/s, depending on > > the > > fileserver. Is there any reason (bug) for such a big difference? > > > > On gigabit network, the copy speed with memcache is never larger than > > 20 > > mbyte/s, with disk cache it can go up to 70 mbyte/s. > > Can you provide more information on your measuring and test environment? > I suppose you didn't actually measured AFS performance when you got 70 > MB/s with diskcache. That's pretty unlikely. > > Horst
Well, it is not actually performance. dd if=/dev/zero to afs space transfer reaches something like that. This is of course a peak number. Half of time data is written to a local disk cache with no network activity, so on average, the transfer would be 30-40 MB/s. AFS read speed is between 10-20 MB/s. New memcache parameters give similar write transfer now (~60 MB/s on average). Cheers, Andrej -- _____________________________________________________________ doc. dr. Andrej Filipcic, E-mail: [EMAIL PROTECTED] Department of Experimental High Energy Physics - F9 Jozef Stefan Institute, Jamova 39, P.o.Box 3000 SI-1001 Ljubljana, Slovenia Tel.: +386-1-477-3674 Fax: +386-1-425-7074 ------------------------------------------------------------- _______________________________________________ OpenAFS-info mailing list [email protected] https://lists.openafs.org/mailman/listinfo/openafs-info
