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- $Id: FAQ.Bandwidth.txt,v 1.3 2021/05/20 11:46:07 gilles Exp gilles $
- This documentation is also available online at
- https://imapsync.lamiral.info/FAQ.d/
- https://imapsync.lamiral.info/FAQ.d/FAQ.Bandwidth.txt
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- Imapsync bandwidth used
- =======================================================================
- Questions answered in this FAQ are:
- Q. What is the bandwidth used by imapsync?
- Now the questions again with their answers.
- =======================================================================
- Q. What is the bandwidth used by imapsync?
- R. From the host where imapsync runs, imapsync opens two imap
- connections, one with the source account at host1, one with the
- destination account at host2.
-
- So, the global bandwidth used by an imapsync transfer is twice the
- volume of the source account, one volume to download the messages from
- host1, one volume to upload those messages to host2.
- If the host2 is already filled with the messages, imapsync doesn't
- transfer them and then the volume transferred is small, this volume is
- just made up of the IMAP commands needed to identify the messages on
- both sides.
-
- There is no local cache of the email messages, except when a message
- is very big; it is then temporarily saved locally between the download
- and the upload.
-
- The biggest message seen so far on the online service I call /X is
- 3.08 GiB while the biggest message transferred is 1.51 GiB. So I
- suspect a bug here. Drop me a note if you encounter the same issue,
- I'll then dig into it, ie, I'll create a 2 or 3 GiB big message and
- play with it :-)
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