append in IMAP4 from imaplib very slow

[Simon Pirschel]

On 07/26/2012 11:25 AM, Simon Pirschel wrote:
> Ok, forget about the EXISTS and RECENT response. The server will 
> response this way if you selected a mailbox, which I did in the Python 
> code but not in the Perl code. I disabled selecting the mailbox in 
> Python and there is no difference in the runtime. So, this isn't the 
> issue.

I solved the issue. The bad performance is caused by the socketopt 
socket.TCP_NODELAY set to 0 by default.

Request timing with socket.TCP_NODELAY=0: 0.0501310825348 seconds
Request timing with socket.TCP_NODELAY=1: 0.0027711391449 seconds

This is a huge difference. Setting TCP_NODELAY=1 will bring the runtime 
from 3:30 minutes down to 14 seconds! Not Perl speed, but close.

Simon
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