Re: [Evolution] IMAPx and message body search

[Patrick O'Callaghan <poc usb ve>]

On Fri, 2020-07-24 at 23:22 +0100, Pete Biggs wrote:
> Evo 3.36.3
>
> Has something changed recently with searches?  A while ago I turned on
> indexing on my Dovecot IMAP server and, as expected, it massively
> increased the speed of "Message contains" searches. Recently though the
> searches have returned to being deathly slow - Dovecot is still
> indexing the mail.
>
> I ran debugging output on the IMAP exchange and it looks like it is
> stepping through each message rather than asking Dovecot to do the
> search (I searched for "printer"):
>
> A00076 OK [READ-WRITE] Select completed (0.001 + 0.000 secs).'
> [imapx:A] I/O: 'A00078 UID SEARCH UID 147137 BODY printer'
> [imapx:A] I/O: '* SEARCH
> A00078 OK Search completed (0.020 + 0.000 + 0.019 secs).'
> [imapx:A] I/O: 'A00079 UID SEARCH UID 147318 BODY printer'
> [imapx:A] I/O: '* SEARCH
> A00079 OK Search completed (0.018 + 0.000 + 0.017 secs).'
> [imapx:A] I/O: 'A00080 UID SEARCH UID 146691 BODY printer'
> [imapx:A] I/O: '* SEARCH
> A00080 OK Search completed (0.018 + 0.000 + 0.017 secs).'
> [imapx:A] I/O: 'A00081 UID SEARCH UID 146000 BODY printer'
> [imapx:A] I/O: '* SEARCH
>
> there's about 150k messages in the folder and at 0.017s per message, it
> will take 42 mins to complete.  The CAPABILITY response on that account
> is:
>
> [imapx:A] I/O: 'A00015 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS
>  ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSU
> BJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-
> EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SE
> ARCH LIST-STATUS SPECIAL-USE BINARY MOVE] Logged in'
>
> Is this an Evolution problem or is it something up with Dovecot - i.e.
> is it advertising the correct capabilities that Evolution uses for
> offloading the search? Dovecot was upgraded to 2.3.10 from 2.3.9 back
> in March (this is on a CentOS 7 system), but I think the problem
> started after that.

I access Gmail via IMAP (I don't sync the contents locally) and
searching is almost instantaneous, so that would seem to point to
Dovecot being the problem.

poc