On 11 Dec 2017, at 3:14, 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.
I saw something similar last week when I wiped my TM disk and started
afresh. TM got to 120GB out of 750GB and then showed little progress for
several hours.
I resolved it by quitting various apps. I cannot recall which one I
quit that got TM working again, but I have quite a few that clock up CPU
and I/O even when not in focus.
The following StackExchange article may shed some light.
https://apple.stackexchange.com/questions/212537/time-machine-ridiculously-slow-after-el-capitan-upgrade
Scroll down to the first answer for details.
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