On 10 May 2018 at 07:52 Shawn Heisey elyograg@elyograg.org wrote:
On 5/9/2018 10:15 PM, Shawn Heisey wrote:
It's been about three weeks since I asked this question. All the information I have available says that all users have no limits on virtual memory, so it must be dovecot itself that sets the limit. Can that be changed in the 1.2 version? I can't upgrade to 2.x yet.
Here's an actual syslog entry, redacted to remove identifying info:
May 9 21:55:48 frodo dovecot: IMAP(REDACTED1): mmap() failed with index cache file /home/vmail/REDACTED2/dovecot.index.cache: Cannot allocate memory
The file that it could not mmap here is 189843456 bytes.
I may have figured it out. After a little googling to see how virtual memory limits are set in C programs, and then some grepping of the 1.2.15 dovecot source, I saw evidence that setting the mail_process_size value in dovecot.conf can increase the limit on virtual memory. I have done this, and will keep an eye on the log to see if it helps.
Thanks, Shawn
Hi Shawn, you've figured it out correctly. If you can spare the memory, you should probably up the default vsize limit to something like 1G.
Aki