On 11 Dec 2017, at 23:26, Bill Cole wrote:
On 10 Dec 2017, at 21:14 (-0500), Steven M. Bellovin wrote:
My suspicion is that the problem has to do with very large
directories on APFS file systems
This would be shocking. One of the rationales for APFS existing is
that the HFS foundation was played out for dealing with large
directories efficiently. I haven't looked into the details (life is
short...) but if APFS is *worse* than HFS{+,X} with large directories
then Apple is in a worse state than I had thought...
Yah. I have no other explanation, though. To give a current example, on
a machine -- an old one, to be sure -- a Time Machine backup started
almost 10 hours ago. It's dumped 77.5 MB -- out of a total of 152.7 MB
-- in that time, and it's been at about 77 MB for the last ~7-8 hours.
At some point, though, it will pass the expensive point and run at a
reasonable rate. This dump is to a directly connected USB 2.0 drive. And
the CPU is about 96% idle, according to 'top'.
Btw: by "big", I mean that I have one mailbox with 114K messages; the
directory itself is 3.6 MB. No other mailbox is more than half that
size, though I have four that are over 1 MB.
I'm not hearing of problems like mine from anyone else, though. The best
suggestion thus far is by Patrik, who suggested excluding Messages from
dumps, but Benny suggests that that's problematic. I may try it for a
few days just to see if it helps; if it does, it would nail down the
immediate cause.
--Steve Bellovin, https://www.cs.columbia.edu/~smb
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