The regression benchmarks found a regression for mixed read/write workload and MEMORY tables. The following shows the last two good and the first two bad releases for each major version of the MariaDB server. From 10.2 onward there are no good releases any more.
Test 't_oltp-memory-multi' - sysbench OLTP read/write
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32 Memory tables with 100K rows each
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numbers are queries per second
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#thread count 1 8 16 32 64 128 256
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mariadb-5.5.48 985.74 4912.4 7701.0 8719.2 8484.9 8441.0 8425.6
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mariadb-5.5.49 962.26 4532.4 7638.5 8332.6 8167.6 8143.0 8135.8
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mariadb-5.5.50 559.35 3036.3 5002.7 4960.6 5011.1 5019.3 5012.1
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mariadb-5.5.51 571.61 3576.5 5357.0 4830.9 4913.1 4912.8 4914.3
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...
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mariadb-10.0.23 948.63 5292.5 7040.5 7106.2 7047.1 7037.4 7044.7
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mariadb-10.0.24 938.52 5259.6 6961.9 7021.9 7032.9 7034.6 7024.4
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mariadb-10.0.25 563.74 3536.8 5893.9 5786.6 5816.9 5797.2 5799.1
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mariadb-10.0.26 548.38 3516.5 6002.7 5807.9 5788.9 5780.5 5786.1
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...
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mariadb-10.1.12 958.87 5353.0 6957.1 8403.9 7739.5 7749.0 7766.4
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mariadb-10.1.13 949.01 5510.0 7114.3 8458.5 8295.2 8216.3 8291.6
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mariadb-10.1.14 567.69 3743.1 6147.7 5653.2 5400.9 5439.1 5415.8
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mariadb-10.1.15 549.83 3580.7 5666.3 5267.9 5286.0 5340.9 5293.5
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...
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mariadb-10.2.1 487.03 3116.2 4802.8 4393.1 4452.0 4446.7 4457.6
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mariadb-10.2.2 495.54 3065.3 4600.5 4423.6 4487.9 4488.6 4496.6
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...
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mariadb-10.3.0 486.31 3070.2 5629.3 5160.6 5325.6 5308.0 5305.6
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mariadb-10.3.1 500.91 3278.9 5541.2 5335.6 5433.4 5430.5 5439.4
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...
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mariadb-10.4.0 462.51 2641.8 5303.6 4985.9 5048.4 5045.9 5045.3
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Bug
Major
