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planner: update the variable name related to Instance Plan Cache #56068

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merged 6 commits into from
Sep 18, 2024
Merged

planner: update the variable name related to Instance Plan Cache #56068

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1a61b9b
fixup
qw4990 Sep 13, 2024
a78e3ad
fixup
qw4990 Sep 13, 2024
11a0bc6
fixup
qw4990 Sep 13, 2024
521f8a1
fixup
qw4990 Sep 13, 2024
2aa95a1
fixup
qw4990 Sep 13, 2024
11d136f
fixup
qw4990 Sep 18, 2024
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6 changes: 3 additions & 3 deletions pkg/domain/domain.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3110,9 +3110,9 @@ func (do *Domain) StopAutoAnalyze() {

// InitInstancePlanCache initializes the instance level plan cache for this Domain.
func (do *Domain) InitInstancePlanCache() {
softLimit := variable.InstancePlanCacheTargetMemSize.Load()
hardLimit := variable.InstancePlanCacheMaxMemSize.Load()
do.instancePlanCache = NewInstancePlanCache(softLimit, hardLimit)
softLimit := float64(hardLimit) * (1 - variable.InstancePlanCacheReservedPercentage.Load())
do.instancePlanCache = NewInstancePlanCache(int64(softLimit), hardLimit)
// use a separate goroutine to avoid the eviction blocking other operations.
do.wg.Run(do.planCacheEvictTrigger, "planCacheEvictTrigger")
do.wg.Run(do.planCacheMetricsAndVars, "planCacheMetricsAndVars")
Expand All @@ -3136,8 +3136,8 @@ func (do *Domain) planCacheMetricsAndVars() {
select {
case <-ticker.C:
// update limits
softLimit := variable.InstancePlanCacheTargetMemSize.Load()
hardLimit := variable.InstancePlanCacheMaxMemSize.Load()
softLimit := int64(float64(hardLimit) * (1 - variable.InstancePlanCacheReservedPercentage.Load()))
curSoft, curHard := do.instancePlanCache.GetLimits()
if curSoft != softLimit || curHard != hardLimit {
do.instancePlanCache.SetLimits(softLimit, hardLimit)
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32 changes: 18 additions & 14 deletions pkg/executor/set_test.go
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Expand Up @@ -768,20 +768,24 @@ func TestSetVar(t *testing.T) {

// test for instance plan cache variables
tk.MustQuery("select @@global.tidb_enable_instance_plan_cache").Check(testkit.Rows("0")) // default 0
tk.MustQuery("select @@global.tidb_instance_plan_cache_target_mem_size").Check(testkit.Rows("104857600"))
tk.MustQuery("select @@global.tidb_instance_plan_cache_max_mem_size").Check(testkit.Rows("125829120"))
tk.MustExecToErr("set global tidb_instance_plan_cache_target_mem_size = 125829121") // target <= max
tk.MustExecToErr("set global tidb_instance_plan_cache_max_mem_size = 104857599")
tk.MustExec("set global tidb_instance_plan_cache_target_mem_size = 114857600")
tk.MustQuery("select @@global.tidb_instance_plan_cache_target_mem_size").Check(testkit.Rows("114857600"))
tk.MustExec("set global tidb_instance_plan_cache_max_mem_size = 135829120")
tk.MustQuery("select @@global.tidb_instance_plan_cache_max_mem_size").Check(testkit.Rows("135829120"))
tk.MustExec("set global tidb_instance_plan_cache_max_mem_size = 1GiB")
tk.MustQuery("select @@global.tidb_instance_plan_cache_max_mem_size").Check(testkit.Rows("1073741824"))
tk.MustExec("set global tidb_instance_plan_cache_target_mem_size = 999MiB")
tk.MustQuery("select @@global.tidb_instance_plan_cache_target_mem_size").Check(testkit.Rows("1047527424"))
tk.MustExec("set global tidb_instance_plan_cache_target_mem_size = 998MiB")
tk.MustQuery("select @@global.tidb_instance_plan_cache_target_mem_size").Check(testkit.Rows("1046478848"))
tk.MustQuery("select @@global.tidb_instance_plan_cache_max_size").Check(testkit.Rows("104857600"))
tk.MustExec("set global tidb_instance_plan_cache_max_size = 135829120")
tk.MustQuery("select @@global.tidb_instance_plan_cache_max_size").Check(testkit.Rows("135829120"))
tk.MustExec("set global tidb_instance_plan_cache_max_size = 999999999")
tk.MustQuery("select @@global.tidb_instance_plan_cache_max_size").Check(testkit.Rows("999999999"))
tk.MustExec("set global tidb_instance_plan_cache_max_size = 1GiB")
tk.MustQuery("select @@global.tidb_instance_plan_cache_max_size").Check(testkit.Rows("1073741824"))
tk.MustExec("set global tidb_instance_plan_cache_max_size = 2GiB")
tk.MustQuery("select @@global.tidb_instance_plan_cache_max_size").Check(testkit.Rows("2147483648"))
tk.MustExecToErr("set global tidb_instance_plan_cache_max_size = 2.5GiB")
tk.MustQuery("select @@global.tidb_instance_plan_cache_max_size").Check(testkit.Rows("2147483648"))
tk.MustQuery("select @@global.tidb_instance_plan_cache_reserved_percentage").Check(testkit.Rows("0.1"))
tk.MustExec(`set global tidb_instance_plan_cache_reserved_percentage=1.1`)
tk.MustQuery("select @@global.tidb_instance_plan_cache_reserved_percentage").Check(testkit.Rows("1"))
tk.MustExec(`set global tidb_instance_plan_cache_reserved_percentage=-0.1`)
tk.MustQuery("select @@global.tidb_instance_plan_cache_reserved_percentage").Check(testkit.Rows("0"))
tk.MustExec(`set global tidb_instance_plan_cache_reserved_percentage=0.5`)
tk.MustQuery("select @@global.tidb_instance_plan_cache_reserved_percentage").Check(testkit.Rows("0.5"))

// test variables for cost model ver2
tk.MustQuery("select @@tidb_cost_model_version").Check(testkit.Rows(fmt.Sprintf("%v", variable.DefTiDBCostModelVer)))
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22 changes: 9 additions & 13 deletions pkg/sessionctx/variable/sysvar.go
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Expand Up @@ -1348,19 +1348,15 @@ var defaultSysVars = []*SysVar{
EnableInstancePlanCache.Store(TiDBOptOn(val))
return nil
}},
{Scope: ScopeGlobal, Name: TiDBInstancePlanCacheTargetMemSize, Value: strconv.Itoa(int(DefTiDBInstancePlanCacheTargetMemSize)), Type: TypeStr,
{Scope: ScopeGlobal, Name: TiDBInstancePlanCacheReservedPercentage,
Value: strconv.FormatFloat(DefTiDBInstancePlanCacheReservedPercentage, 'f', -1, 64),
Type: TypeFloat, MinValue: 0, MaxValue: 1,
GetGlobal: func(_ context.Context, s *SessionVars) (string, error) {
return strconv.FormatInt(InstancePlanCacheTargetMemSize.Load(), 10), nil
return strconv.FormatFloat(InstancePlanCacheReservedPercentage.Load(), 'f', -1, 64), nil
},
SetGlobal: func(_ context.Context, s *SessionVars, val string) error {
v, str := parseByteSize(val)
if str == "" {
v = uint64(TidbOptInt64(val, int64(DefTiDBInstancePlanCacheTargetMemSize)))
}
if v > uint64(InstancePlanCacheMaxMemSize.Load()) {
return errors.New("tidb_instance_plan_cache_target_mem_size must be less than tidb_instance_plan_cache_max_mem_size")
}
InstancePlanCacheTargetMemSize.Store(int64(v))
v := tidbOptFloat64(val, DefTiDBInstancePlanCacheReservedPercentage)
InstancePlanCacheReservedPercentage.Store(v)
return nil
}},
{Scope: ScopeGlobal, Name: TiDBInstancePlanCacheMaxMemSize, Value: strconv.Itoa(int(DefTiDBInstancePlanCacheMaxMemSize)), Type: TypeStr,
Expand All @@ -1370,10 +1366,10 @@ var defaultSysVars = []*SysVar{
SetGlobal: func(_ context.Context, s *SessionVars, val string) error {
v, str := parseByteSize(val)
if str == "" {
v = uint64(TidbOptInt64(val, int64(DefTiDBInstancePlanCacheTargetMemSize)))
v = uint64(TidbOptInt64(val, int64(DefTiDBInstancePlanCacheMaxMemSize)))
}
if v < uint64(InstancePlanCacheTargetMemSize.Load()) {
return errors.New("tidb_instance_plan_cache_max_mem_size must be greater than tidb_instance_plan_cache_target_mem_size")
if v < 0 {
return errors.New("tidb_instance_plan_cache_max_mem_size must be a non-negative integer")
}
InstancePlanCacheMaxMemSize.Store(int64(v))
return nil
Expand Down
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