Hi!
Rerun the regression on the sub versions. Either it is the STL or a
change in replication (I would bet on replication).
Cheers,
-Brian
On May 1, 2009, at 9:11 PM, Jay Pipes wrote:
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Hi!
Somewhere in r990, we have had a significant regression, most
evident in
concurrency levels greater than 128 concurrent connections:
+-----------+-------------+-------------+
| version | concurrency | tps |
+-----------+-------------+-------------+
| trunk-989 | 2 | 1050.630000 |
| trunk-989 | 4 | 1417.433333 |
| trunk-989 | 8 | 1942.686667 |
| trunk-989 | 16 | 2612.166667 |
| trunk-989 | 32 | 3389.150000 |
| trunk-989 | 64 | 3944.433333 |
| trunk-989 | 128 | 3924.076667 |
| trunk-989 | 256 | 2964.776667 |
| trunk-989 | 512 | 1981.050000 |
| trunk-989 | 1024 | 1273.133333 |
| trunk-989 | 2048 | 563.350000 |
| trunk-990 | 2 | 1038.133333 |
| trunk-990 | 4 | 1381.933333 |
| trunk-990 | 8 | 1897.276667 |
| trunk-990 | 16 | 2547.196667 |
| trunk-990 | 32 | 3331.570000 |
| trunk-990 | 64 | 3896.483333 |
| trunk-990 | 128 | 3850.016667 |
| trunk-990 | 256 | 2331.543333 |
| trunk-990 | 512 | 1862.316667 |
| trunk-990 | 1024 | 1103.903333 |
| trunk-990 | 2048 | 436.976667 |
+-----------+-------------+-------------+
The above TPS column is the average of 3 iterations of a readonly
sysbench workload for the revision/concurrency pair.
Unfortunately, r990 was a very big revision with a lot of changes:
http://bazaar.launchpad.net/~drizzle-developers/drizzle/development/revision/990
This makes it very difficult to tell what precisely has caused the
regression. I'd like to suggest that going forward, we really try to
keep the size of merges and commits small so that it is easier to tell
where regressions occur.
Anyone interested in looking through the commit diff above is
welcome to
suggest ideas where regression may have occurred...but it might be,
like
Brian says, death by a thousand cuts...
Cheers!
Jay
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--
_______________________________________________________
Brian "Krow" Aker, brian at tangent.org
Seattle, Washington
http://krow.net/ <-- Me
http://tangent.org/ <-- Software
_______________________________________________________
You can't grep a dead tree.
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