> Bron Gondwana wrote: >> On Thu, Nov 18, 2010 at 12:58:10PM -0500, Michael D. Sofka wrote: >>> Is it safe to run multiple sync_clients? Is there an advantage to >>> doing so? >>> >>> I had to restart sync_client once. After later restarting cyrus two >>> sync_clients were running, and appeared to do well together. Still, I >>> stopped the old process out of caution. >> >> What version? In 2.3.x, the sync_server will obtain a lock, so you can >> only run one sync_server at a time. This means the sync_clients will >> take it in turns sending data. > > 2.3.16. This description fits what I was seeing. > > >> In 2.4, there is no global locking - just locks on each mailbox. So >> it's >> possible for two sync_clients to run at the same time. There is a >> possibility this will lead to the same data being sent twice. It won't >> cause corruption, but it will cause excess IO! >> >> Are you sure it's actually two sync_client instances? In every released >> version, sync_client forks immediately upon starting and then forks >> again >> to actually send data. > > Yes. There were a total of 4 sync processes. Two parents, each with a > child worker. The logs showed two sync_client processes taking turns. > >> Which is a problem because it opens the BDB environment once and closes >> it >> many times. So I've now changed it on my development branch to not fork >> the second time, but just keep it all in once process. We'll see if >> there >> are actually any memory leaks left! > > Another question I have is what are /var/lib/imap/db/*? File says they > are Berkeley dbs, but I thought all databases were skiplist in this > release. I can't find the configuration options associated with this That's not true for 2.3.16. Some db's are still BDB by default in vanilla 2.3.16. Simon ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/
