On Mon, 2003-02-17 at 01:04, [EMAIL PROTECTED] wrote: > On Sunday, February 16, 2003, at 06:36 PM, Garance A Drosihn wrote: > > > At 5:01 PM -0800 2/16/03, [EMAIL PROTECTED] wrote: > >> nfs 0.120u 21.030s 4:19.47 8.1% > >> afs 0.5G cache 0.100u 517.330s 10:49.84 79.6% > >> afs 2GB cache 0.060u 20.570s 4:49.58 7.1% > >> > >> In these tests, I copy a 1 GB file from the client to the server. > >> In both NFS and AFS cases, I use the same client and server machines. > >> > >> Notice that with the 0.5 GB cache, it takes about 2.5x longer to > >> copy the file, and consumes almost 80% of the CPU, mostly in system > >> time. The 2 GB cache case is more reasonable, taking just > >> slightly longer than NFS. > > > > Notice that your cache is half the size of the file you're trying > > to copy. In the past we at RPI have noticed that AFS performance > > is bad if the machine has a cache size that is smaller than a > > file you want to work on. > > Yes, that was the point; copying a file bigger than the cache. I > wanted to confirm that this is expected behavior, especially as bad as > I am seeing. I hope this can get fixed someday, because files are > constantly getting bigger. > > Of course, disks are getting bigger as well. Is there a limit on the > size of the cache? I understand files can't be larger that 2 GB, but > is there some cache size limit at 2 or 4 GB?
Not that I am aware of other than occasional instability. But I don't know that this has anything to do with the cache size itself. I've had a 15GB one on one of our ftp servers without much trouble for a while. FYI, I don't believe file size is limited to 2GB any more with current linux servers and clients, not sure if the largefile support has been implemented for other systypes or not though. -- Nathan ------------------------------------------------------------ Nathan Neulinger EMail: [EMAIL PROTECTED] University of Missouri - Rolla Phone: (573) 341-4841 Computing Services Fax: (573) 341-4216 _______________________________________________ OpenAFS-info mailing list [EMAIL PROTECTED] https://lists.openafs.org/mailman/listinfo/openafs-info
