77 lines
1.9 KiB
Go
77 lines
1.9 KiB
Go
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// Copyright 2014 Google Inc.
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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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// +build ignore
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// This binary compares memory usage between btree and gollrb.
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package main
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import (
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"flag"
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"fmt"
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"math/rand"
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"runtime"
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"time"
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"github.com/google/btree"
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"github.com/petar/GoLLRB/llrb"
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)
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var (
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size = flag.Int("size", 1000000, "size of the tree to build")
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degree = flag.Int("degree", 8, "degree of btree")
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gollrb = flag.Bool("llrb", false, "use llrb instead of btree")
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)
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func main() {
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flag.Parse()
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vals := rand.Perm(*size)
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var t, v interface{}
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v = vals
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var stats runtime.MemStats
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for i := 0; i < 10; i++ {
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runtime.GC()
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}
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fmt.Println("-------- BEFORE ----------")
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runtime.ReadMemStats(&stats)
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fmt.Printf("%+v\n", stats)
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start := time.Now()
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if *gollrb {
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tr := llrb.New()
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for _, v := range vals {
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tr.ReplaceOrInsert(llrb.Int(v))
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}
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t = tr // keep it around
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} else {
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tr := btree.New(*degree)
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for _, v := range vals {
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tr.ReplaceOrInsert(btree.Int(v))
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}
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t = tr // keep it around
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}
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fmt.Printf("%v inserts in %v\n", *size, time.Since(start))
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fmt.Println("-------- AFTER ----------")
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runtime.ReadMemStats(&stats)
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fmt.Printf("%+v\n", stats)
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for i := 0; i < 10; i++ {
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runtime.GC()
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}
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fmt.Println("-------- AFTER GC ----------")
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runtime.ReadMemStats(&stats)
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fmt.Printf("%+v\n", stats)
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if t == v {
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fmt.Println("to make sure vals and tree aren't GC'd")
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}
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}
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