mirror of
https://github.com/MariaDB/server.git
synced 2025-10-19 06:02:12 +02:00
![]() The linear read-ahead, which is enabled by default by a nonzero default value of innodb_read_ahead_threshold=56, only works if index leaf pages or undo log pages have been allocated on adjacent page numbers. That is not always the case. After this change, the exact nonzero values of innodb_read_ahead_threshold matter only for the read-ahead of undo log pages. For the read-ahead of B-tree leaf pages when starting a read from an index, it only matters if innodb_read_ahead_threshold=0. buf_read_ahead_undo(): Renamed from buf_read_ahead_linear(). This function will no longer be invoked on any BLOB pages (for which FIL_PAGE_PREV and FIL_PAGE_NEXT were not initialized consistently) nor on any index pages. For index leaf pages, we will introduce buf_read_ahead_one() and buf_read_ahead_pages(). btr_cur_t::search_leaf(), btr_cur_t::open_leaf(): Implement read-ahead for up to 16 leaf-level B-tree pages. This logic is enabled by a nonzero value of innodb_read_ahead_threshold; the actual value will not matter here. buf_read_ahead_update(), buf_read_ahead_update_sql(): Some common code for updating counters. buf_read_ahead_one(): Read ahead one (sibling leaf) page. This logic cannot be disabled. buf_read_ahead_pages(): Read ahead B-tree index leaf pages. buf_read_ahead_random(): Split the function into two parts: one that determines which range of pages should be read, and another that actually initiates a read of the pages. buf_read_page_low(): Remove a bogus comment. btr_pcur_move_to_next_page(): Invoke buf_read_ahead_one() instead of buf_read_ahead_linear(). btr_pcur_move_backward_from_page(): Implement a fast path of trying to acquire a latch on the previous page without waiting, and invoke buf_read_ahead_one() on the preceding page, with the assumption that we may be accessing that page in the near future. btr_copy_blob_prefix(): Simplify the logic. On other than ROW_FORMAT=COMPRESSED BLOB pages, the FIL_PAGE_NEXT field is not meaningfully initialized. The FIL_PAGE_PREV field is not pointing to anything meaningful either. buf_read_ahead_linear() expects these to be set meaningfully. Only the non-default setting innodb_random_read_ahead=ON might be meaningful here. |
||
---|---|---|
.. | ||
collections | ||
include | ||
lib | ||
main | ||
std_data | ||
suite | ||
asan.supp | ||
CMakeLists.txt | ||
dgcov.pl | ||
lsan.supp | ||
mariadb-stress-test.pl | ||
mariadb-test-run.pl | ||
mtr.out-of-source | ||
purify.supp | ||
README | ||
README-gcov | ||
README.stress | ||
suite.pm | ||
valgrind.supp |
This directory contains test suites for the MariaDB server. To run currently existing test cases, execute ./mysql-test-run in this directory. Some tests are known to fail on some platforms or be otherwise unreliable. In the file collections/smoke_test there is a list of tests that are expected to be stable. In general you do not have to have to do "make install", and you can have a co-existing MariaDB installation, the tests will not conflict with it. To run the tests in a source directory, you must do "make" first. In Red Hat distributions, you should run the script as user "mysql". The user is created with nologin shell, so the best bet is something like # su - # cd /usr/share/mysql-test # su -s /bin/bash mysql -c ./mysql-test-run This will use the installed MariaDB executables, but will run a private copy of the server process (using data files within /usr/share/mysql-test), so you need not start the mysqld service beforehand. You can omit --skip-test-list option if you want to check whether the listed failures occur for you. To clean up afterwards, remove the created "var" subdirectory, e.g. # su -s /bin/bash - mysql -c "rm -rf /usr/share/mysql-test/var" If tests fail on your system, please read the following manual section for instructions on how to report the problem: https://mariadb.com/kb/en/reporting-bugs If you want to use an already running MySQL server for specific tests, use the --extern option to mysql-test-run. Please note that in this mode, you are expected to provide names of the tests to run. For example, here is the command to run the "alias" and "analyze" tests with an external server: # mysql-test-run --extern socket=/tmp/mysql.sock alias analyze To match your setup, you might need to provide other relevant options. With no test names on the command line, mysql-test-run will attempt to execute the default set of tests, which will certainly fail, because many tests cannot run with an external server (they need to control the options with which the server is started, restart the server during execution, etc.) You can create your own test cases. To create a test case, create a new file in the main subdirectory using a text editor. The file should have a .test extension. For example: # xemacs t/test_case_name.test In the file, put a set of SQL statements that create some tables, load test data, and run some queries to manipulate it. Your test should begin by dropping the tables you are going to create and end by dropping them again. This ensures that you can run the test over and over again. If you are using mysqltest commands in your test case, you should create the result file as follows: # mysql-test-run --record test_case_name or # mysqltest --record < t/test_case_name.test If you only have a simple test case consisting of SQL statements and comments, you can create the result file in one of the following ways: # mysql-test-run --record test_case_name # mysql test < t/test_case_name.test > r/test_case_name.result # mysqltest --record --database test --result-file=r/test_case_name.result < t/test_case_name.test When this is done, take a look at r/test_case_name.result. If the result is incorrect, you have found a bug. In this case, you should edit the test result to the correct results so that we can verify that the bug is corrected in future releases. If you want to submit your test case you can send it to developers@lists.mariadb.org or attach it to a bug report on http://mariadb.org/jira/. If the test case is really big or if it contains 'not public' data, then put your .test file and .result file(s) into a tar.gz archive, add a README that explains the problem, ftp the archive to ftp://ftp.mariadb.org/private and submit a report to https://mariadb.org/jira about it. The latest information about mysql-test-run can be found at: https://mariadb.com/kb/en/mariadb/mysqltest/ If you want to create .rdiff files, check https://mariadb.com/kb/en/mariadb/mysql-test-auxiliary-files/