Brian Aker: Drizzle, boost::unordered_multimap++
========================================================================================================= REGRESSION REPORT ========================================================================================================= MACHINE: drizzle-build-n01.wc1.dfw1.stabletransit.com RUN ID: 324 RUN DATE: 2010-07-27T21:48:07.932094 WORKLOAD: innodb_1000K_readonly SERVER: drizzled VERSION: lp:drizzle/staging REVISION: 1669 COMMENT: 1669: Brian Aker 2010-07-27 This patch turns the table_cache into boost::unordered_multimap. =========================================================================================================
TRENDING OVER LAST 5 runs Conc TPS % Diff from Avg Diff Norm? Min Max Avg STD ========================================================================================================= 16 1993.10 +1.19% 23.37 within norms 1905.44 2010.28 1969.73 26.56 32 2676.28 +1.75% 46.11 outside norms 2568.20 2685.05 2630.17 33.22 64 2622.82 -2.09% -56.00 outside norms 2613.02 2737.89 2678.82 43.09 128 2621.23 -0.61% -16.15 within norms 2609.74 2662.30 2637.38 16.41 256 2598.18 +5.50% 135.46 outside norms 2406.50 2599.34 2462.72 68.67 512 2343.83 +52.30% 804.91 outside norms 1318.38 2347.49 1538.92 402.80 1024 1722.08 +104.66% 880.65 outside norms 614.65 1725.52 841.43 440.35
Boost::unordered_multimap versus the hand crafted MySQL HASH?
Boost wins by a long shot. The above is from sysbench. We run it on each and every push that goes into the main tree looking for regression.
Every so often we get to see the opposite happen :)
Thanks to this patch, "Table" now joins the ranks of what we call a "trusted object". This means we can start safely assuming that the destructor on it is working (most of the MySQL codebase was crafted in such a way that you can only use a very limited subset of C++). In all of the new code in Drizzle we can easily make use of C++. There are still a few older bits where we cannot. Having "Table" now work means we can safely work in a number of new areas in the server. One of the biggest changes that will be coming soon is the removal of LOCK_open for a number of new cases.
URL: http://krow.livejournal.com/694185.html
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