Vaughan, > What I have so far are 2 filters which gather the inbound traffic and > outbound traffic for each transaction. These work ok and when logging > transactions to file all of the in/out byte amounts appear to be correct. > The first problem however, is that each child has its own set of memory and > therefore keeps its own totals per virtual host. This also means that > multiple logging events occur for each transaction. I could just log this > all to database but it would 1) be inefficient and 2) cause the size of the > database to grow quite quickly. >
It sounds to me like you could go two ways with this. I don't know the format of your database table, but it should be possible to update it atomically using something like: INSERT INTO bandwidth (vhost_id, bw_in, bw_out) VALUES (42, 1124, 5023409) ON DUPLICATE KEY UPDATE bw_in = bw_in + 1124, bw_out = bw_out + 5023409 but that could lead to a lot of load. Another way might be for each child to collect statistics and only flush to the database periodically, say every 30 seconds (perhaps configurable on a per-vhost basis, so that load-heavy sites could have larger update intervals). It would still be possible to use the query above though. This query could probably even be updated to split statistics on a date/time basis, if you require more granular reporting. Or have I missed/misunderstood something? Dave
