Rob Mueller wrote:
so I wonder, will skiplist be a better choice? obviously running
quota(8) will be a very cheap operation, but I'm worried about
contention on the quota database during delivery etc. (these users are
for the most part not actively using the system -- they get less than
one message per day each(!) -- so I probably worry too much.)
The problem I saw was that accessing a skiplist db involves locking the
entire file I believe. This felt like a huge point of contention,
especially since every email delivered would lock it. I never did end up
trying it out to test that though, so I wouldn't quote me on that, Ken
could confirm.
This is true. If you want to use a single database, I would consider
using BDB (as painful as it sounds), since it does localized locking. I
don't believe that either choice has been tested thoroughly however.
--
Kenneth Murchison
Systems Programmer
Project Cyrus Developer/Maintainer
Carnegie Mellon University
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