I assume red is PostgreSQL and green is MySQL. That reflects my own benchmarks with those two.

But I don't fully understand what the graph displays. Does it reflect the ability of the underlying database to support a certain amount of users per second given a certain database size? Or is the growth of the database part of the benchmark?

Btw, did you consider that older topics are normally read much less and almost never get new postings? I think the size of the "active data set" is more dependent on the amount of active members than on the actual amount of data available. That can reduce the impact of the size of the database greatly, although we saw very nice gains in performance on our forum (over 22GB of messages) when replacing the databaseserver with one with twice the memory, cpu's and I/O.

Best regards,

Arjen

On 20-5-2007 16:58 PFC wrote:

    I felt the world needed a new benchmark ;)
So : Forum style benchmark with simulation of many users posting and viewing forums and topics on a PHP website.

    http://home.peufeu.com/ftsbench/forum1.png

One of those curves is "a very popular open-source database which claims to offer unparallelled speed". The other one is of course Postgres 8.2.3 which by popular belief is "full-featured but slow"

    What is your guess ?

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