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caches_gc_overhead_comparison.go
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caches_gc_overhead_comparison.go
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package main
import (
"fmt"
"runtime"
"runtime/debug"
"time"
"github.com/allegro/bigcache"
"github.com/coocood/freecache"
)
func gcPause() time.Duration {
runtime.GC()
var stats debug.GCStats
debug.ReadGCStats(&stats)
return stats.Pause[0]
}
const (
entries = 20000000
valueSize = 100
)
func main() {
debug.SetGCPercent(10)
fmt.Println("Number of entries: ", entries)
config := bigcache.Config{
Shards: 256,
LifeWindow: 100 * time.Minute,
MaxEntriesInWindow: entries,
MaxEntrySize: 200,
Verbose: true,
}
bigcache, _ := bigcache.NewBigCache(config)
for i := 0; i < entries; i++ {
key, val := generateKeyValue(i, valueSize)
bigcache.Set(key, val)
}
firstKey, _ := generateKeyValue(1, valueSize)
checkFirstElement(bigcache.Get(firstKey))
fmt.Println("GC pause for bigcache: ", gcPause())
bigcache = nil
gcPause()
//------------------------------------------
freeCache := freecache.NewCache(entries * 200) //allocate entries * 200 bytes
for i := 0; i < entries; i++ {
key, val := generateKeyValue(i, valueSize)
if err := freeCache.Set([]byte(key), val, 0); err != nil {
fmt.Println("Error in set: ", err.Error())
}
}
firstKey, _ = generateKeyValue(1, valueSize)
checkFirstElement(freeCache.Get([]byte(firstKey)))
if freeCache.OverwriteCount() != 0 {
fmt.Println("Overwritten: ", freeCache.OverwriteCount())
}
fmt.Println("GC pause for freecache: ", gcPause())
freeCache = nil
gcPause()
//------------------------------------------
mapCache := make(map[string][]byte)
for i := 0; i < entries; i++ {
key, val := generateKeyValue(i, valueSize)
mapCache[key] = val
}
fmt.Println("GC pause for map: ", gcPause())
}
func checkFirstElement(val []byte, err error) {
_, expectedVal := generateKeyValue(1, valueSize)
if err != nil {
fmt.Println("Error in get: ", err.Error())
} else if string(val) != string(expectedVal) {
fmt.Println("Wrong first element: ", string(val))
}
}
func generateKeyValue(index int, valSize int) (string, []byte) {
key := fmt.Sprintf("key-%010d", index)
fixedNumber := []byte(fmt.Sprintf("%010d", index))
val := append(make([]byte, valSize-10), fixedNumber...)
return key, val
}