imapsync very poor performance

[DESOUTTER, Chloé]

Hi,

Yes it's slow. I suggest you run it in two passes :

- One pass lists the folders and prepares imapsync scripts to sync them.
- The second pass runs imapsync processes in parallel (4 or 5 max at the 
same time).

I could speed up my migration by about 60% this way. Still not perfect I 
admit.

You could also enable asynchronous writes on the target FS so it's not 
blocking. Since basically what you're doing is an offline sync, data 
loss is no big deal as you can just start over in case of power failure.

Yours sincerely

Le 02.12.2013 15:41, Christian Hügel a écrit :
> i,
> 
> I´m running imapsync-1.569-1.el6.noarch on a Centos 6.5 x64 system
> with 8GB RAM and a dual 3Ghz AMD cpu. The sync runs on the "target
> server and the source server is a dovecot 1.2.1
> Here are some stats:
> 
> 0.01 msgs/s 63.780 KiB/s ETA: Mon Dec 2 22:31:21 2013 28528 s 328 msgs 
> left
> 0.01 msgs/s 65.135 KiB/s ETA: Tue Dec 3 01:17:36 2013 38356 s 327 msgs 
> left
> 0.01 msgs/s 65.076 KiB/s ETA: Mon Dec 2 21:44:20 2013 25560 s 326 msgs 
> left
> 0.01 msgs/s 65.238 KiB/s ETA: Mon Dec 2 23:08:44 2013 30484 s 325 msgs 
> left
> 0.01 msgs/s 65.181 KiB/s ETA: Mon Dec 2 21:26:25 2013 24344 s 324 msgs 
> left
> 0.02 msgs/s 65.122 KiB/s ETA: Mon Dec 2 20:18:12 2013 20251 s 323 msgs 
> left
> 0.02 msgs/s 65.235 KiB/s ETA: Mon Dec 2 19:46:36 2013 18332 s 322 msgs 
> left
> 
> and the cpu is during the sync at 100% The size of the mails are
> normal no attachments so I realy don´t know where´s the issue here.
> The size of the mailbox is only 300MB but I have a couple of huge
> mailboxes (>17GB). With this speed it´s quite impossible to migrate my
> mailboxes to the new kolab 3.1 server
> 
> Can you please help me out with this issue? Thank you
> 
> Christian
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