RE: Tests settup for MDC1

["Doug Olson" <dlolson@lbl.gov>]

> -----Original Message-----
> From: Arie Shoshani [mailto:shoshani@lbl.gov]
> Sent: Friday, August 28, 1998 12:50 PM
...
> 
> 1.  Tests will be conducted in two configurations:
>      a) A stand alone Storage Manager exercised by the INQ_EI test tool
>          (Objectivity is also not involved).

Does this test move the data files or is it really just testing
the index?

> 
> 3)  To make the length of time realistic we think that it should be
> proportional to the number of events in a file.  There will be two
> methods of doing that:
>       a) a fixed parameter per event that we can vary for each test
>            (e.g. 1, 30, 1000 sec - corresponding to different analysis
> types:
>            Hadron, event-by-event, etc.)

The range 1-1000 sec/event is about right for STAR, large events.
To simulate small STAR events or other experiments the time/event
should be able to go below 1 sec.  I.e., don't use integer seconds
for this time, either floating point or integer milliseconds.


> 
> In addition to measuring performance, we hope to discover with the above
> controlled experiments the bottleneck in the system for various query
> mixes.  If the event processing time is very small, we will expect the
> caching of files from tape to be the bottleneck.  If the event
> processing is very long, we expect the cache size to be the bottleneck. 
> It will be interesting to find the event processing time that balances
> the two.

I think the issue of one vs. two tape drives is important and relevent to
most measurements, so you need to consider when these measurements
can be made.

> 
> Another test we may want to do (if we have the time) is to launch lots
> of queries (100-1000) simultaneously to test the robustness of the
> system, and perhaps the performance of Objectivity in such cases.
> 

For "real" queries with star or phenix analysis code running we will
probably hit memory limits before getting 100 queries on rmds03.
I do think it is good ro run the number of queries up to the point
things fall apart tho.

Doug