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Added status variable "stack_usable" to be able to check stack usage

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Monty
2024-10-21 15:05:14 +03:00
parent ae0cbfe934
commit 0de9e40f4b
3 changed files with 122 additions and 0 deletions
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46
mysql-test/main/stack.result Normal file
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@@ -0,0 +1,46 @@
# Checking stack usage
#
# basic tests
#
select variable_value > 0 from information_schema.session_status where variable_name="stack_usage";
variable_value > 0
1
#
# Ensure stack usage is same for each iteration when using WITH recursive
#
create table t1
WITH recursive Fibonacci(PrevN, N, Stack) AS
(
SELECT 0, 1, 0
UNION ALL
SELECT N, PrevN + N, (select variable_value from information_schema.session_status where variable_name="stack_usage")
FROM Fibonacci
WHERE N < 100000
)
SELECT PrevN as N, Stack FROM Fibonacci;
select (select stack from t1 where n=2) = (select stack from t1 where N=75025);
(select stack from t1 where n=2) = (select stack from t1 where N=75025)
1
DROP table t1;
#
# Check stack with recursion
#
set @@max_sp_recursion_depth=20;
create or replace procedure recursion(x int, max int, OUT res int)
begin
select variable_value into res from information_schema.session_status where variable_name="stack_usage";
if (x < max) then
call recursion(x+1, max, res);
end if;
end;
$$
call recursion(0,2,@s1);
call recursion(0,3,@s2);
call recursion(0,4,@s3);
select @s1 > 0 && @s2 > 0 && @s3 > 0;
@s1 > 0 && @s2 > 0 && @s3 > 0
1
drop procedure recursion;
#
# End of 10.5 tests
#

60
mysql-test/main/stack.test Normal file
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@@ -0,0 +1,60 @@
--echo # Checking stack usage
--echo #
--echo # basic tests
--echo #
select variable_value > 0 from information_schema.session_status where variable_name="stack_usage";
--echo #
--echo # Ensure stack usage is same for each iteration when using WITH recursive
--echo #
create table t1
WITH recursive Fibonacci(PrevN, N, Stack) AS
(
SELECT 0, 1, 0
UNION ALL
SELECT N, PrevN + N, (select variable_value from information_schema.session_status where variable_name="stack_usage")
FROM Fibonacci
WHERE N < 100000
)
SELECT PrevN as N, Stack FROM Fibonacci;
select (select stack from t1 where n=2) = (select stack from t1 where N=75025);
DROP table t1;
--echo #
--echo # Check stack with recursion
--echo #
set @@max_sp_recursion_depth=20;
delimiter $$;
create or replace procedure recursion(x int, max int, OUT res int)
begin
select variable_value into res from information_schema.session_status where variable_name="stack_usage";
if (x < max) then
call recursion(x+1, max, res);
end if;
end;
$$
delimiter ;$$
call recursion(0,2,@s1);
call recursion(0,3,@s2);
call recursion(0,4,@s3);
select @s1 > 0 && @s2 > 0 && @s3 > 0;
if (`select @s2-@s1 <> @s3 - @s2`)
{
echo "Wrong result";
select @s1 ,@s2, @s3, @s2-@s1, @s3-@s2;
}
drop procedure recursion;
--echo #
--echo # End of 10.5 tests
--echo #

16
sql/mysqld.cc
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@@ -7315,6 +7315,21 @@ static int show_memory_used(THD *thd, SHOW_VAR *var, void *buff,
}
static int show_stack_usage(THD *thd, SHOW_VAR *var, void *buff,
system_status_var *, enum_var_type scope)
{
var->type= SHOW_ULONGLONG;
var->value= buff;
// We cannot get stack usage for 'global' or for another thread
if (scope == OPT_GLOBAL || thd != current_thd)
*(ulonglong*) buff= 0;
else
*(ulonglong*) buff= (ulonglong) (available_stack_size((char*) thd->thread_stack,
my_get_stack_pointer(0)));
return 0;
}
#ifndef DBUG_OFF
static int debug_status_func(THD *thd, SHOW_VAR *var, void *buff,
system_status_var *, enum_var_type)
@@ -7581,6 +7596,7 @@ SHOW_VAR status_vars[]= {
{"Ssl_version", (char*) &show_ssl_get_version, SHOW_SIMPLE_FUNC},
#endif
#endif /* HAVE_OPENSSL */
SHOW_FUNC_ENTRY("stack_usage", &show_stack_usage),
{"Syncs", (char*) &my_sync_count, SHOW_LONG_NOFLUSH},
/*
Expression cache used only for caching subqueries now, so its statistic