[Chandler-dev] Real world perf vs. test perf

Heikki Toivonen heikki at osafoundation.org
Tue Feb 27 17:25:22 PST 2007

We've known for some time that our automated performance tests use test
data that is quite different from real world cases.

In short, our test data is a big 3000 event calendar in single
collection, with 2-4 tiny helper collections thrown in, mostly
non-recurring events and small payloads (body).

In the real world we are seeing 3 or more collections with up to a
couple of hundred events (some exceptions with up to a 1000 events), and
most events being recurring events, with lots of overlays and events
shared between collections, and mostly recurring events with some large

I did a comparison with Katie's data vs. the test data, results
available at

Based on the comparison with Katie's data we can divide into three
categories: 1) cases where real world is significantly slower (over
10%), 2) cases where test data is significantly slower (over 10%) and 3)
minor differences.

We have 6 out of 11 tests in the first bucket, with view switching
leading the difference being over twice as slow in the real world case.
3 cases fall into the second bucket.

The 6 cases in the first bucket might call for some revision to our test
data, but I would like to run some additional tests with more real world
data. Note that I don't think we can optimize away all of the
difference, but a third might be doable.

I could run the tests if you send me your .ini file (do Test > Save
settings... first). Or you could run your own tests - please check with
me first for instructions.

  Heikki Toivonen

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