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