I set first only 2048 buffers as i supposed buffers does not matter on RAM DISK because read from file is really read from RAM. But to my surprise (maybe not so big surprise) the results are as >3 times slower. Is this overhead becouse of using Windows file read api compared to direct read from cache or something else involved?
PS> FB4 looks faster than FB3 ~7% - i test only one time FB4 then i must retest it. 48 isql sessions Server version: WI-T4.0.0.1435 Firebird 4.0 Beta 1 FB_ARCHITECTURE DB_NAME FORCED_WRITES SWEEP_INT PAGE_BUFFERS PAGE_SIZE SuperServer 4.0.0 P:\DB\OLTP4.FDB ON 20000 2048 8192 ACTION AVG_TIMES_PER_MINUTE AVG_ELAPSED_MS SUCCESSFUL_TIMES_DONE JOB_BEG JOB_END *** OVERALL *** for 60 minutes: 4701.57 9891 282094 2019-02-16 18:35 2019-02-16 19:35 FB_ARCHITECTURE DB_NAME FORCED_WRITES SWEEP_INT PAGE_BUFFERS PAGE_SIZE SuperServer 4.0.0 P:\DB\OLTP4.FDB ON 20000 262144 819 ACTION AVG_TIMES_PER_MINUTE AVG_ELAPSED_MS SUCCESSFUL_TIMES_DONE JOB_BEG JOB_END *** OVERALL *** for 60 minutes: 15029.05 5049 901743 2019-02-16 21:45 2019-02-16 22:45 For comparision 60 minutes tests for FB3 and FB2.5 FB_ARCHITECTURE DB_NAME FORCED_WRITES SWEEP_INT PAGE_BUFFERS PAGE_SIZE SuperServer 3.0.5 P:\DB\OLTP3.FDB ON 20000 262144 8192 ACTION AVG_TIMES_PER_MINUTE AVG_ELAPSED_MS SUCCESSFUL_TIMES_DONE JOB_BEG JOB_END *** OVERALL *** for 60 minutes: 14005.30 5365 840318 2019-02-11 21:21 2019-02-11 22:21 FB_ARCHITECTURE DB_NAME FORCED_WRITES SWEEP_INT PAGE_BUFFERS PAGE_SIZE Classic 2.5.9 P:\DB\OLTP2.FDB ON 20000 12288 8192 ACTION AVG_TIMES_PER_MINUTE AVG_ELAPSED_MS SUCCESSFUL_TIMES_DONE JOB_BEG JOB_END *** OVERALL *** for 60 minutes: 1164.40 48244 69864 2019-02-12 18:41 2019-02-12 19:41 FB_ARCHITECTURE DB_NAME FORCED_WRITES SWEEP_INT PAGE_BUFFERS PAGE_SIZE SuperClassic 2.5.9 P:\DB\OLTP2.FDB ON 20000 12288 8192 ACTION AVG_TIMES_PER_MINUTE AVG_ELAPSED_MS SUCCESSFUL_TIMES_DONE JOB_BEG JOB_END *** OVERALL *** for 60 minutes: 6176.02 16168 370561 2019-02-12 21:35 2019-02-12 22:35 FB_ARCHITECTURE DB_NAME FORCED_WRITES SWEEP_INT PAGE_BUFFERS PAGE_SIZE SuperServer 2.5.9 P:\DB\OLTP2.FDB ON 20000 262144 8192 ACTION AVG_TIMES_PER_MINUTE AVG_ELAPSED_MS SUCCESSFUL_TIMES_DONE JOB_BEG JOB_END *** OVERALL *** for 60 minutes: 1263.35 46980 75801 2019-02-13 00:07 2019-02-13 01:07 Regards, Karol Bieniaszewski
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