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calculator.go
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/
calculator.go
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/*
* Copyright 2018-2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package calc
import (
"fmt"
)
const (
ClassSize = int64(5_800)
ClassOverhead = int64(14_000_000)
)
type Calculator struct {
HeadRoom int
LoadedClassCount int
ThreadCount int
TotalMemory Size
}
func (c Calculator) Calculate(flags string) (MemoryRegions, error) {
m, err := NewMemoryRegionsFromFlags(flags)
if err != nil {
return MemoryRegions{}, fmt.Errorf("unable to create memory regions from flags\n%w", err)
}
if m.Metaspace == nil {
m.Metaspace = &Metaspace{
Value: ClassOverhead + (ClassSize * int64(c.LoadedClassCount)),
Provenance: Calculated,
}
}
f, err := m.FixedRegionsSize(c.ThreadCount)
if err != nil {
return MemoryRegions{}, fmt.Errorf("unable to calculate fixed regions size\n%w", err)
}
if f.Value > c.TotalMemory.Value {
return MemoryRegions{}, fmt.Errorf(
"fixed memory regions require %s which is greater than %s available for allocation: %s",
f, c.TotalMemory, m.FixedRegionsString(c.ThreadCount),
)
}
m.HeadRoom = &HeadRoom{
Value: int64((float64(c.HeadRoom) / 100) * float64(c.TotalMemory.Value)),
Provenance: Calculated,
}
n, err := m.NonHeapRegionsSize(c.ThreadCount)
if err != nil {
return MemoryRegions{}, fmt.Errorf("unable to calculate non-heap regions size\n%w", err)
}
if n.Value > c.TotalMemory.Value {
return MemoryRegions{}, fmt.Errorf(
"non-heap memory regions require %s which is greater than %s available for allocation: %s",
n, c.TotalMemory, m.NonHeapRegionsString(c.ThreadCount),
)
}
if m.Heap == nil {
m.Heap = &Heap{
Value: c.TotalMemory.Value - n.Value,
Provenance: Calculated,
}
}
a, err := m.AllRegionsSize(c.ThreadCount)
if err != nil {
return MemoryRegions{}, fmt.Errorf("unable to calculate all regions size\n%w", err)
}
if a.Value > c.TotalMemory.Value {
return MemoryRegions{}, fmt.Errorf(
"all memory regions require %s which is greater than %s available for allocation: %s",
a, c.TotalMemory, m.AllRegionsString(c.ThreadCount))
}
return m, nil
}