On 11 Dec 2017, at 2:14, Steven M. Bellovin wrote:
Seems like an improbable subject line--but is anyone else who uses
MailMate on High Sierra/APFS suddenly having serious Time Machine
performance issues? I am, on two different laptops. An iMac, which has
a hard drive and hence HFS+, is not having any trouble.
.
The overall symptom is that backups take *many hours*, with sudden,
inexplicable stalls. I say "inexplicable" because Activity Monitor
shows essentially no CPU, network, or disk activity -- but the backup
just *stops*. I normally don't run MailMate on one of the laptops; its
backups complete in a rational amount of time. When I do, it sees the
same stalls. In fact, I'm running MailMate on it right now so that I
can see what happens on my primary laptop when I exit MailMate. Sure
enough, that machine is now behaving.
.
My suspicion is that the problem has to do with very large directories
on APFS file systems, but I don't know that for sure. I have some very
large mailboxes, though, and these are of course active when MailMate
is running. And of course, that doesn't explain why I don't see any
system activity.
.
Is anyone else seeing this? Does anyone have any work-arounds, other
than "don't have such large mailboxes" or "don't run APFS"? I do have
a new laptop on order; I'm seriously tempted to reformat it as HFS+
before I start using it.
Having read the other replies I would question Activity Monitor. AM is
an application built on top of the real data recording and it wouldn’t
surprise me in the least if Apple filter out any sort of activity they
think you shouldn’t be concerned with. Try using ‘top’ in a
terminal window. Unless Apple have doctored a long standing utility that
will tell you what is really going on. Running ‘top’ without
arguments, the header gives you:
Load Average (which is the number of processes waiting for the CPU
averaged over 1, 5, and 15 minutes - an indication of overall load, more
useful for servers,
CPU usage (and idle %age),
Memory usage,
Swap,
Network traffic, and
Disk I/O
It updates every second (by default). The report below the header is at
a per-process level. It’s surprising how busy the system really is.
Hitting the ‘q’ key stops it. ’man top’ will tell you how to
control the rest of the o/p.
David
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