mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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ac40ca5269
Mainnet: ``` 447M accounts.0-544.l 45M accounts.0-544.li 133M code.0-544.l 14M code.0-544.li 2.0G storage.0-544.l 197M storage.0-544.li ``` Decided no to use Roaring - because it can only keep full bitmap in RAM (no way to stream into file). But it's more compact 2Gb -> 1.4Gb. Maybe can shard large bitmap - or do other trick (storage has 1B keys - sharding probably is cheap). Maybe in the future.
113 lines
3.4 KiB
Go
113 lines
3.4 KiB
Go
//go:build !windows
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/*
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Copyright 2021 Erigon contributors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package mmap
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import (
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"errors"
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"fmt"
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"os"
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"syscall"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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const MaxMapSize = 0xFFFFFFFFFFFF
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// mmap memory maps a DB's data file.
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func MmapRw(f *os.File, size int) ([]byte, *[MaxMapSize]byte, error) {
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// Map the data file to memory.
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mmapHandle1, err := unix.Mmap(int(f.Fd()), 0, size, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED)
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if err != nil {
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return nil, nil, err
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}
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// Advise the kernel that the mmap is accessed randomly.
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err = unix.Madvise(mmapHandle1, syscall.MADV_RANDOM)
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if err != nil && !errors.Is(err, syscall.ENOSYS) {
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// Ignore not implemented error in kernel because it still works.
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return nil, nil, fmt.Errorf("madvise: %w", err)
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}
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mmapHandle2 := (*[MaxMapSize]byte)(unsafe.Pointer(&mmapHandle1[0]))
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return mmapHandle1, mmapHandle2, nil
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}
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func Mmap(f *os.File, size int) ([]byte, *[MaxMapSize]byte, error) {
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// Map the data file to memory.
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mmapHandle1, err := unix.Mmap(int(f.Fd()), 0, size, syscall.PROT_READ, syscall.MAP_SHARED)
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if err != nil {
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return nil, nil, err
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}
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// Advise the kernel that the mmap is accessed randomly.
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err = unix.Madvise(mmapHandle1, syscall.MADV_RANDOM)
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if err != nil && !errors.Is(err, syscall.ENOSYS) {
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// Ignore not implemented error in kernel because it still works.
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return nil, nil, fmt.Errorf("madvise: %w", err)
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}
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mmapHandle2 := (*[MaxMapSize]byte)(unsafe.Pointer(&mmapHandle1[0]))
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return mmapHandle1, mmapHandle2, nil
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}
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func MadviseSequential(mmapHandle1 []byte) error {
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err := unix.Madvise(mmapHandle1, syscall.MADV_SEQUENTIAL)
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if err != nil && !errors.Is(err, syscall.ENOSYS) {
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// Ignore not implemented error in kernel because it still works.
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return fmt.Errorf("madvise: %w", err)
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}
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return nil
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}
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func MadviseNormal(mmapHandle1 []byte) error {
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err := unix.Madvise(mmapHandle1, syscall.MADV_NORMAL)
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if err != nil && !errors.Is(err, syscall.ENOSYS) {
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// Ignore not implemented error in kernel because it still works.
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return fmt.Errorf("madvise: %w", err)
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}
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return nil
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}
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func MadviseWillNeed(mmapHandle1 []byte) error {
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err := unix.Madvise(mmapHandle1, syscall.MADV_WILLNEED)
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if err != nil && !errors.Is(err, syscall.ENOSYS) {
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// Ignore not implemented error in kernel because it still works.
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return fmt.Errorf("madvise: %w", err)
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}
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return nil
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}
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func MadviseRandom(mmapHandle1 []byte) error {
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err := unix.Madvise(mmapHandle1, syscall.MADV_RANDOM)
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if err != nil && !errors.Is(err, syscall.ENOSYS) {
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// Ignore not implemented error in kernel because it still works.
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return fmt.Errorf("madvise: %w", err)
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}
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return nil
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}
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// munmap unmaps a DB's data file from memory.
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func Munmap(mmapHandle1 []byte, _ *[MaxMapSize]byte) error {
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// Ignore the unmap if we have no mapped data.
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if mmapHandle1 == nil {
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return nil
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}
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// Unmap using the original byte slice.
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err := unix.Munmap(mmapHandle1)
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return err
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}
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