Re: Faster nnimap: nnimap-retrieve-groups-asynchronous

[Danny Siu <dsiu@adobe.com>]

'g' is now ~150% faster than before for my 60+ nnimap groups on UoW imapd.

cool stuff!

Simon Josefsson writes:

  Simon> I tried to speed up new mail checking (`g') on IMAP groups.
  Simon> Startup uses old technique, but subsequent `g' can be faster.  The
  Simon> speedup depends on how many groups usually receives new mail each
  Simon> time you press `g' (the p below).  It might depend on the server as
  Simon> well.  For me, it is faster against Cyrus IMAPD -- results from
  Simon> other servers would be interesting.

  Simon> nnimap-retrieve-groups-asynchronous's value is t

  Simon> Documentation: Send asynchronous STATUS commands for each mailbox
  Simon> before checking mail.  If you have mailboxes that rarely receives
  Simon> mail, this speeds up new mail checking.  It works by first sending
  Simon> STATUS commands for each mailbox, and then only checking groups
  Simon> which has a modified UIDNEXT more carefully for new mail.

  Simon> In summary, the default is O((1-p)*k+p*n) and changing it to nil
  Simon> makes it O(n).  If p is small, then the default is probably faster.

  Simon> You can customize this variable.

  Simon> Defined in `nnimap'.



-- 
Danny Siu