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52c29f3bdc
Heap tables are allocated blocks to store rows according to my_default_record_cache (mapped to the server global variable read_buffer_size). This causes performance issues when the record length is big (> 1000 bytes) and the my_default_record_cache is small. Changed to instead split the default heap allocation to 1/16 of the allowed space and not use my_default_record_cache anymore when creating the heap. The allocation is also aligned to be just under a power of 2. For some test that I have been running, which was using record length=633, the speed of the query doubled thanks to this change. Other things: - Fixed calculation of max_records passed to hp_create() to take into account padding between records. - Updated calculation of memory needed by heap tables. Before we did not take into account internal structures needed to access rows. - Changed block sized for memory_table from 1 to 16384 to get less fragmentation. This also avoids a problem where we need 1K to manage index and row storage which was not counted for before. - Moved heap memory usage to a separate test for 32 bit. - Allocate all data blocks in heap in powers of 2. Change reported memory usage for heap to reflect this. Reviewed-by: Sergei Golubchik <serg@mariadb.org> |
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| .. | ||
| alter.test | ||
| autoinc.test | ||
| commit_id.test | ||
| create.test | ||
| cte.test | ||
| debug.test | ||
| delete.test | ||
| delete_history.test | ||
| derived.test | ||
| foreign.combinations | ||
| foreign.test | ||
| insert.test | ||
| insert2.test | ||
| misc.test | ||
| not_embedded.test | ||
| online.test | ||
| optimized.test | ||
| partition.test | ||
| replace.test | ||
| rpl.test | ||
| rpl_mix.test | ||
| rpl_row.test | ||
| select.test | ||
| select2.test | ||
| simple.test | ||
| sysvars.test | ||
| trx_id.opt | ||
| trx_id.test | ||
| update-big.test | ||
| update.test | ||
| view.test | ||