dovecot - Oct 2022 - Dovecot does not start on MacOS Monterey

Thanks for the explanation. In the other thread it was mentioned that the only
setting that works with this problem is setting default_vsz_limit to 0 which
sounds like the lowest limit possible.

Von meinem iPhone gesendet
> Am 28.10.2022 um 18:28 schrieb Shawn Heisey <elyograg at
elyograg.org>:
> 
> ?On 10/26/22 04:27, Doro Rose wrote:
>> Thanks for the quick response!
>> No. If I set default_vsz_limit to 0 it works. My understanding was that
this shouldn't be necessary in the first place, shouldn't it?
> 
> Most systems and software do not limit the virtual memory size. This is
because virtual memory is just address space until something actually uses it,
and the OS can ensure that an application that is working correctly with regard
to virtual memory will NOT allocate too much real memory because of virtual
memory.
> 
> Dovecot is actually the only software I have seen that has a native config
for limiting the virtual memory size.  I know why it's done ... there are
certain classes of bug that can result in virtual memory leakage.  Because
virtual memory is NOT real memory, this class of bug might go unnoticed if there
is no limit.  Putting a limit on the size makes sure that bugs of that nature
ARE caught.
> 
> My dovecot install is not huge ... only 200K total email messages stored. 
But I had to increase the default_vsz_limit to get dovecot working.  I think it
defaults to 256M, I increased it to 1024M.  Dovecot's log should tell you
how much virtual memory Dovecot is requesting, if the request fails.
> 
> Thanks,
> Shawn
>

On 10/30/22 07:24, Doro Rose wrote:
> Thanks for the explanation. In the other thread it was mentioned that the
only setting that works with this problem is setting default_vsz_limit to 0
which sounds like the lowest limit possible.
A setting of 0 tells dovecot to not set a limit, at which point whatever 
the OS has set will take effect.? Whenever I look at the setting for an 
OS that I use it says "unlimited."

Thanks,
Shawn