Vdbench warmup= parameter and run 'avg' numbers

Question:

For the "avg2-xxxx" that vdbench puts out at the end of the test run, I was wondering if there was anyway to tune vdbench to use a different starting interval for the average, something other than 2? I've been running tests and we have some cases where it actually takes a while for the IO to reach a stable state. "

Answer:

There is an elapsed= and an interval= parameter, and Vdbench502 also has a warmup= parameter.
Normally only the first interval is ignored, but with warmup= the first 'warmup= / interval=' intervals are ignored.
Do realize though that the total elapsed time is increased by the warmup time.
Example, elapsed=60,warmup=10,interval=1
will run for 70 seconds, with only the last 60 seconds included in the avg_11-70 totals.

Comments:

Hi Henk, remember me from when I was at Sun ? I work at HP now. Is vdbench still freely downloadable ? I saw a comment on your blog that Oracle are only making SWAT available to customer with a support contract and it made me wonder about vdbench. Thanks, Tim

Posted by Tim Thomas on February 04, 2011 at 07:51 PM MST #

Vdbench will stay open source.
Henk.

Posted by Henk Vandenbergh on February 04, 2011 at 09:52 PM MST #

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Blog for Henk Vandenbergh, author of Vdbench, and Sun StorageTek Workload Analysis Tool (Swat). This blog is used to keep you up to date about anything revolving around Swat and Vdbench.

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