Samuel Bayer wrote (Tue Jun 30 2009 16:24:32 GMT+0200 (CEST))
Felix Frank wrote:
Another tidbit that is either hopelessly banal because I don't
understand how AFS works, or really important: WRITING to the same
AFS directory works fine. I copy the file from the directory to my
local disk and it takes 4 minutes; I delete the file from the remote
disk and write it there from my local disk and it takes 30 seconds.
Just a side remark: If the file is smaller than your cache, then this
is probably the cache manager writing to the cache, which is supposed
to be fast. I'd expect a rather sharp corner in the write performance
curve as soon as your amount of data surpasses disk cache size.
Thanks, but this appears not to be the problem. My cache is 30MB, and
the file I'm exchanging is 70MB. I'm watching the copy progress in the
Finder, and it doesn't appear to slow down appreciably when it hits the
halfway mark.
Note that this only applies to disk cache (plus, I'm somewhat suspicious
of third party progress bars, as the logic behind those cannot easily be
assessed).
Anyway, a cache bottleneck would result in a longer overall write time,
which is obviously not the case. For a disk cache, 30MB is rather slim.
A larger disk cache may be of benefit.
...but do stick with memcache if it works well for you.
Cheers
- Felix
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