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The motivation of introducing the parameter innodb_purge_rseg_truncate_frequency in mysql/mysql-server@28bbd66ea5 and mysql/mysql-server@8fc2120fed seems to have been to avoid stalls due to freeing undo log pages or truncating undo log tablespaces. In MariaDB Server, innodb_undo_log_truncate=ON should be a much lighter operation than in MySQL, because it will not involve any log checkpoint. Another source of performance stalls should be trx_purge_truncate_rseg_history(), which is shrinking the history list by freeing the undo log pages whose undo records have been purged. To alleviate that, we will introduce a purge_truncation_task that will offload this from the purge_coordinator_task. In that way, the next innodb_purge_batch_size pages may be parsed and purged while the pages from the previous batch are being freed and the history list being shrunk. The processing of innodb_undo_log_truncate=ON will still remain the responsibility of the purge_coordinator_task. purge_coordinator_state::count: Remove. We will ignore innodb_purge_rseg_truncate_frequency, and act as if it had been set to 1 (the maximum shrinking frequency). purge_coordinator_state::do_purge(): Invoke an asynchronous task purge_truncation_callback() to free the undo log pages. purge_sys_t::iterator::free_history(): Free those undo log pages that have been processed. This used to be a part of trx_purge_truncate_history(). purge_sys_t::clone_end_view(): Take a new value of purge_sys.head as a parameter, so that it will be updated while holding exclusive purge_sys.latch. This is needed for race-free access to the field in purge_truncation_callback(). Reviewed by: Vladislav Lesin
29 lines
569 B
Plaintext
29 lines
569 B
Plaintext
# This test case will test R-tree purge.
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--source include/innodb_page_size.inc
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--source include/have_sequence.inc
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--source include/not_valgrind.inc
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# This test often times out with MSAN
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--source include/not_msan.inc
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create table t (
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b point not null,d point not null, spatial key (d),spatial key (b)
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) engine=innodb;
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--disable_query_log
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set @p=point(1,1);
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let $n=200;
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while ($n) {
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begin;
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insert into t select @p,@p from seq_1_to_130;
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delete from t;
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commit;
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dec $n;
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}
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--enable_query_log
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--source ../../innodb/include/wait_all_purged.inc
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# Clean up.
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drop table t;
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