Essentially, the problem is that safemalloc is excruciatingly
slow as it checks all allocated blocks for overrun at each
memory management primitive, yielding a almost exponential
slowdown for the memory management functions (malloc, realloc,
free). The overrun check basically consists of verifying some
bytes of a block for certain magic keys, which catches some
simple forms of overrun. Another minor problem is violation
of aliasing rules and that its own internal list of blocks
is prone to corruption.
Another issue with safemalloc is rather the maintenance cost
as the tool has a significant impact on the server code.
Given the magnitude of memory debuggers available nowadays,
especially those that are provided with the platform malloc
implementation, maintenance of a in-house and largely obsolete
memory debugger becomes a burden that is not worth the effort
due to its slowness and lack of support for detecting more
common forms of heap corruption.
Since there are third-party tools that can provide the same
functionality at a lower or comparable performance cost, the
solution is to simply remove safemalloc. Third-party tools
can provide the same functionality at a lower or comparable
performance cost.
The removal of safemalloc also allows a simplification of the
malloc wrappers, removing quite a bit of kludge: redefinition
of my_malloc, my_free and the removal of the unused second
argument of my_free. Since free() always check whether the
supplied pointer is null, redudant checks are also removed.
Also, this patch adds unit testing for my_malloc and moves
my_realloc implementation into the same file as the other
memory allocation primitives.
The default storage engine is changed from MyISAM to
InnoDB, in all builds except for the embedded server.
In addition, the following system variables are
changed:
* innodb_file_per_table is enabled
* innodb_strict_mode is enabled
* innodb_file_format_name_update is changed
to 'Barracuda'
The test suite is changed so that tests that do not
explicitly include the have_innodb.inc are run with
--default-storage-engine=MyISAM. This is to ease the
transition, so that most regression tests are run
with the same engine as before.
Some tests are disabled for the embedded server
regression test, as the output of certain statements
will be different that for the regular server
(i.e SELECT @@default_storage_engine). This is to
ease transition.
Added option --user-args, to be used with --start*
Only keeps --defaults-file and --defaults-group-suffix
Also added missing help text entry for --start-and-exit
This patch aims at moving some rpl tests to be run on a daily
basis instead of running on a per push basis. To accomplish such
goal the following modifications are proposed:
- MTR: added --skip-test-list cli parameter
This option allows the user to specify more than one
disabled.def file, for example:
perl mtr --skip-test-list=list1.list --skip-test-list=list2.list
- Added collections/disabled-per-push.list
This file lists the test cases that should be disabled per
push.
- Changed mysql-test/collections/default.push
Added --skip-test-list=collections/disabled-per-push.list
to rpl_binlog_row, ps_row and n_mix runs.
- Changed mysql-test/collections/default.daily
Added rpl_binlog_row run (since it is partially run per push we
should run it fully on a daily basis).
in mysql-trunk-merge).
There were two problems:
- a mistake during merge of a patch for Bug 52629 from 5.1;
- MTR treated auxilary output of newer valgrind as an error.
The fixes are:
- Fix merge error;
- Teach MTR to skip 'HEAP summary' section of valgrind output.
Some logic would group by suite always
Disable this if using --noreorder
Also fix getting array from collect_one_suite() in this case
Amended according to previous comment
