[Dovecot] slow squat fts index creation

[Cor Bosman]

Hi all, ive been playing with squat indexes.  Up to about 300.000 emails in a single mailbox this was working flawlessly. The search index file is about 500MB at that time. Ive now added some more emails, and at 450.000 or so emails im seeing a serious problem with squat index creation. It takes...f o r e v e r .  The .tmp file is being so slowly, it will probably take 2-3 hours to create. Upto this point it took maybe a minute. 

Im doing this in an openvz container, so theoretically i may be hitting some openvz resource limit. But ive upped all the limits and dont see any improvements. I dont see any resources starvation either. 

Could there be some dovecot issue when the search index reaches say 1GB? (im estimating that it's now trying to save about 1GB search index). 

Regards,

Cor