[Dovecot] Inotify instance limit for user exceeded, disabling.
Hi.
What does the warning "Inotify instance limit for user exceeded, disabling." mean, and how do I get rid of it? I assume that I have to change a limit somewhere?
Regards, Anders.
Anders wrote:
What does the warning "Inotify instance limit for user exceeded, disabling." mean, and how do I get rid of it? I assume that I have to change a limit somewhere?
Okay, reading the source has me think that this is an OS limit, so I increased /proc/sys/fs/inotify/max_user_watches
Is there some way to calculate the upper limit? I imaging that each folder in each connection needs a watch?
Cheers, Anders.
On May 5, 2008, at 11:15 AM, Anders wrote:
Anders wrote:
What does the warning "Inotify instance limit for user exceeded, disabling." mean, and how do I get rid of it? I assume that I have to change a limit somewhere?
Okay, reading the source has me think that this is an OS limit, so I increased /proc/sys/fs/inotify/max_user_watches
It says "instance limit", so I think the problem was
max_user_instances instead.
Is there some way to calculate the upper limit? I imaging that each
folder in each connection needs a watch?
They're added when IDLE command is run. Only one IDLE command can be
running at a time per each connection. With maildir it listens for two
directories. But there is only one instance created per process.
I guess you're using a single UID for all users? In that case the
upper limits are:
- max_user_instances = max_mail_processes setting
- max_user_watches = max_mail_processes setting*2
Timo Sirainen wrote:
They're added when IDLE command is run. Only one IDLE command can be running at a time per each connection. With maildir it listens for two directories. But there is only one instance created per process.
So each process has one inotify instance with just two watches. I was under the impression that subfolders were also watched, but after testing a bit, it seems to not be true. Only the SELECTed box is watched, right?
What confused me was that Thunderbird will show new messages in several folders, but I guess it must be using multiple connections, one per open folder.
Is there some way to have clients watch all folders? Server-side filtering loses a bit of its value when you are not notified of the new mail.
I guess you're using a single UID for all users? In that case the upper limits are:
- max_user_instances = max_mail_processes setting
- max_user_watches = max_mail_processes setting*2
I think max_user_watches is per instance, so should that just be 2?
Cheers, Anders.
On May 5, 2008, at 6:19 PM, Anders wrote:
Timo Sirainen wrote:
They're added when IDLE command is run. Only one IDLE command can be running at a time per each connection. With maildir it listens for
two directories. But there is only one instance created per process.So each process has one inotify instance with just two watches. I was under the impression that subfolders were also watched, but after
testing a bit, it seems to not be true. Only the SELECTed box is watched,
right?
Right.
Is there some way to have clients watch all folders? Server-side
filtering loses a bit of its value when you are not notified of the new mail.
Clients typically issue STATUS command for all mailboxes every n
minutes. I've been thinking about having Dovecot issue STATUS events
automatically when mailboxes change, but last I checked most clients
just ignored them. There exists also a draft of a new IMAP extension
where clients can ask for those STATUS events from specified mailboxes.
I guess you're using a single UID for all users? In that case the upper limits are:
- max_user_instances = max_mail_processes setting
- max_user_watches = max_mail_processes setting*2
I think max_user_watches is per instance, so should that just be 2?
So it seems.
participants (2)
-
Anders
-
Timo Sirainen