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cmd/geth, trie: track and report trie cache misses

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This commit is contained in:
Péter Szilágyi 2016-10-18 14:44:41 +03:00
parent c9471e7782
commit 2bb5ec1e41
No known key found for this signature in database
GPG Key ID: 119A76381CCB7DD2
2 changed files with 32 additions and 8 deletions
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26
cmd/geth/chaincmd.go
View File

@ -31,6 +31,7 @@ import (
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/trie"
"github.com/syndtr/goleveldb/leveldb/util"
"gopkg.in/urfave/cli.v1"
)
@ -89,21 +90,30 @@ func importChain(ctx *cli.Context) error {
if err := utils.ImportChain(chain, ctx.Args().First()); err != nil {
utils.Fatalf("Import error: %v", err)
}
fmt.Printf("Import done in %v, compacting...\n", time.Since(start))
fmt.Printf("Import done in %v.\n", time.Since(start))
// Compact the entire database to more accurately measure disk io and print the stats
if db, ok := chainDb.(*ethdb.LDBDatabase); ok {
start = time.Now()
if err := db.LDB().CompactRange(util.Range{}); err != nil {
utils.Fatalf("Compaction failed: %v", err)
}
fmt.Printf("Compaction done in %v.\n", time.Since(start))
// Output pre-compaction stats mostly to see the import trashing
stats, err := db.LDB().GetProperty("leveldb.stats")
if err != nil {
utils.Fatalf("Failed to read database stats: %v", err)
}
fmt.Println(stats)
// Compact the entire database to more accurately measure disk io and print the stats
start = time.Now()
fmt.Println("Compacting entire database...")
if err = db.LDB().CompactRange(util.Range{}); err != nil {
utils.Fatalf("Compaction failed: %v", err)
}
fmt.Printf("Compaction done in %v.\n", time.Since(start))
stats, err = db.LDB().GetProperty("leveldb.stats")
if err != nil {
utils.Fatalf("Failed to read database stats: %v", err)
}
fmt.Println(stats)
fmt.Println("Trie cache misses:", trie.CacheMisses())
}
return nil
}

14
trie/trie.go
View File

@ -20,6 +20,7 @@ package trie
import (
"bytes"
"fmt"
"sync/atomic"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto/sha3"
@ -34,6 +35,17 @@ var (
emptyState common.Hash
)
// cacheMisses maintains the number of times a trie node was loaded from disk.
// Always use atomic operations when accessing this global variable.
var cacheMisses uint64
// CacheMisses retrieves a global counter measuring the number of cache misses
// the trie did since process startup. This isn't useful for anything apart from
// trie debugging purposes.
func CacheMisses() uint64 {
return atomic.LoadUint64(&cacheMisses)
}
func init() {
sha3.NewKeccak256().Sum(emptyState[:0])
}
@ -419,6 +431,8 @@ func (t *Trie) resolve(n node, prefix, suffix []byte) (node, error) {
}
func (t *Trie) resolveHash(n hashNode, prefix, suffix []byte) (node, error) {
atomic.AddUint64(&cacheMisses, 1)
enc, err := t.db.Get(n)
if err != nil || enc == nil {
return nil, &MissingNodeError{