I have had this situation for many YEARS, long before I got MailMate.
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*.
The problem is worse, the more Time Machine needs to back up. And for
reasons I have never figured out, even a routine backup on TM (of a few
hours of material) can have 5GB of files to go through. As a result, I
can get into a situation where TM is completely unable to get up to
date.
So I don’t know a solution, but don’t be too sure that it is really
due to MM. If anyone finds a solution, please drop me a line!
One thing that helps is to switch from WiFi to a hard ethernet
connection. For some reason, TM is considerably faster that way.
Roger Bohn, UC San Diego
rb...@ucsd.edu
On 10 Dec 2017, at 18:14, 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.
--Steve Bellovin, https://www.cs.columbia.edu/~smb
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