6acfdcc5d6
Comparison of -short benchmarks in cayley.
$ benchcmp pointer.bench concrete.bench
benchmark old ns/op new ns/op delta
BenchmarkNamePredicate 1673276 1655093 -1.09%
BenchmarkLargeSetsNoIntersection 318985907 261499984 -18.02%
BenchmarkNetAndSpeed 104403743 41516981 -60.23%
BenchmarkKeanuAndNet 17309258 16857513 -2.61%
BenchmarkKeanuAndSpeed 20159161 19282833 -4.35%
Comparison of pathological cases are not so happy.
benchmark old ns/op new ns/op delta
BenchmarkVeryLargeSetsSmallIntersection 55269775527 246084606672 +345.24%
BenchmarkHelplessContainsChecker 23436501319 24308906949 +3.72%
Profiling the worst case:
Pointer:
Total: 6121 samples
1973 32.2% 32.2% 1973 32.2% runtime.findfunc
773 12.6% 44.9% 773 12.6% readvarint
510 8.3% 53.2% 511 8.3% step
409 6.7% 59.9% 410 6.7% runtime.gentraceback
390 6.4% 66.2% 391 6.4% pcvalue
215 3.5% 69.8% 215 3.5% runtime.funcdata
181 3.0% 72.7% 181 3.0% checkframecopy
118 1.9% 74.6% 119 1.9% runtime.funcspdelta
96 1.6% 76.2% 96 1.6% runtime.topofstack
76 1.2% 77.5% 76 1.2% scanblock
Concrete:
Total: 25027 samples
9437 37.7% 37.7% 9437 37.7% runtime.findfunc
3853 15.4% 53.1% 3853 15.4% readvarint
2366 9.5% 62.6% 2366 9.5% step
2186 8.7% 71.3% 2186 8.7% runtime.gentraceback
1816 7.3% 78.5% 1816 7.3% pcvalue
1016 4.1% 82.6% 1016 4.1% runtime.funcdata
859 3.4% 86.0% 859 3.4% checkframecopy
506 2.0% 88.1% 506 2.0% runtime.funcspdelta
410 1.6% 89.7% 410 1.6% runtime.topofstack
303 1.2% 90.9% 303 1.2% runtime.newstack
104 lines
2.1 KiB
Go
104 lines
2.1 KiB
Go
// Copyright 2014 The Cayley Authors. All rights reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package db
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import (
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"bytes"
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"compress/bzip2"
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"compress/gzip"
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"fmt"
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"io"
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"os"
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"github.com/barakmich/glog"
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"github.com/google/cayley/config"
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"github.com/google/cayley/graph"
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"github.com/google/cayley/quad"
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"github.com/google/cayley/quad/cquads"
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)
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func Load(ts graph.TripleStore, cfg *config.Config, path string) error {
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f, err := os.Open(path)
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if err != nil {
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return fmt.Errorf("could not open file %q: %v", path, err)
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}
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defer f.Close()
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r, err := decompressor(f)
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if err != nil {
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glog.Fatalln(err)
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}
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dec := cquads.NewDecoder(r)
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bulker, canBulk := ts.(graph.BulkLoader)
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if canBulk {
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err = bulker.BulkLoad(dec)
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if err == nil {
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return nil
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}
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if err == graph.ErrCannotBulkLoad {
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err = nil
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}
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}
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if err != nil {
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return err
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}
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block := make([]quad.Quad, 0, cfg.LoadSize)
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for {
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t, err := dec.Unmarshal()
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if err != nil {
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if err == io.EOF {
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break
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}
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return err
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}
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block = append(block, t)
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if len(block) == cap(block) {
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ts.AddTripleSet(block)
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block = block[:0]
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}
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}
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ts.AddTripleSet(block)
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return nil
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}
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const (
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gzipMagic = "\x1f\x8b"
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b2zipMagic = "BZh"
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)
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type readAtReader interface {
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io.Reader
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io.ReaderAt
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}
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func decompressor(r readAtReader) (io.Reader, error) {
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var buf [3]byte
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_, err := r.ReadAt(buf[:], 0)
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if err != nil {
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return nil, err
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}
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switch {
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case bytes.Compare(buf[:2], []byte(gzipMagic)) == 0:
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return gzip.NewReader(r)
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case bytes.Compare(buf[:3], []byte(b2zipMagic)) == 0:
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return bzip2.NewReader(r), nil
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default:
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return r, nil
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}
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}
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