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Merge pull request #2952 from weaveworks/string-keyed-known-service-cache

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optimisation: faster knownServiceCache
This commit is contained in:
Matthias Radestock
2017-11-26 15:11:51 +00:00
committed by GitHub
parent b10f7178ce be8801ab92
commit 91fd411c37
5 changed files with 329 additions and 5 deletions
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2
render/render.go
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@@ -230,5 +230,5 @@ func (ret *joinResults) result() Nodes {
// cache.
func ResetCache() {
renderCache.Purge()
knownServiceCache.Purge()
purgeKnownServiceCache()
}

12
render/theinternet.go
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@@ -4,7 +4,7 @@ import (
"regexp"
"strings"
"github.com/bluele/gcache"
"github.com/camlistore/camlistore/pkg/lru"
"github.com/weaveworks/scope/probe/host"
"github.com/weaveworks/scope/report"
@@ -46,18 +46,22 @@ var (
//
// Since names are generally <50 bytes, this shouldn't weight in
// at more than a few MB of memory.
knownServiceCache = gcache.New(10000).ARC().Build()
knownServiceCache = lru.New(10000)
)
func purgeKnownServiceCache() {
knownServiceCache = lru.New(10000)
}
// TODO: Make it user-customizable https://github.com/weaveworks/scope/issues/1876
// NB: this is a hotspot in rendering performance.
func isKnownService(hostname string) bool {
if v, err := knownServiceCache.Get(hostname); err == nil {
if v, ok := knownServiceCache.Get(hostname); ok {
return v.(bool)
}
known := knownServiceMatcher.MatchString(hostname) && !knownServiceExcluder.MatchString(hostname)
knownServiceCache.Set(hostname, known)
knownServiceCache.Add(hostname, known)
return known
}

202
vendor/github.com/camlistore/camlistore/pkg/lru/COPYING generated vendored Normal file
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@@ -0,0 +1,202 @@
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109
vendor/github.com/camlistore/camlistore/pkg/lru/cache.go generated vendored Normal file
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@@ -0,0 +1,109 @@
/*
Copyright 2011 Google Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// Package lru implements an LRU cache.
package lru // import "camlistore.org/pkg/lru"
import (
"container/list"
"sync"
)
// Cache is an LRU cache, safe for concurrent access.
type Cache struct {
maxEntries int
mu sync.Mutex
ll *list.List
cache map[string]*list.Element
}
// *entry is the type stored in each *list.Element.
type entry struct {
key string
value interface{}
}
// New returns a new cache with the provided maximum items.
func New(maxEntries int) *Cache {
return &Cache{
maxEntries: maxEntries,
ll: list.New(),
cache: make(map[string]*list.Element),
}
}
// Add adds the provided key and value to the cache, evicting
// an old item if necessary.
func (c *Cache) Add(key string, value interface{}) {
c.mu.Lock()
defer c.mu.Unlock()
// Already in cache?
if ee, ok := c.cache[key]; ok {
c.ll.MoveToFront(ee)
ee.Value.(*entry).value = value
return
}
// Add to cache if not present
ele := c.ll.PushFront(&entry{key, value})
c.cache[key] = ele
if c.ll.Len() > c.maxEntries {
c.removeOldest()
}
}
// Get fetches the key's value from the cache.
// The ok result will be true if the item was found.
func (c *Cache) Get(key string) (value interface{}, ok bool) {
c.mu.Lock()
defer c.mu.Unlock()
if ele, hit := c.cache[key]; hit {
c.ll.MoveToFront(ele)
return ele.Value.(*entry).value, true
}
return
}
// RemoveOldest removes the oldest item in the cache and returns its key and value.
// If the cache is empty, the empty string and nil are returned.
func (c *Cache) RemoveOldest() (key string, value interface{}) {
c.mu.Lock()
defer c.mu.Unlock()
return c.removeOldest()
}
// note: must hold c.mu
func (c *Cache) removeOldest() (key string, value interface{}) {
ele := c.ll.Back()
if ele == nil {
return
}
c.ll.Remove(ele)
ent := ele.Value.(*entry)
delete(c.cache, ent.key)
return ent.key, ent.value
}
// Len returns the number of items in the cache.
func (c *Cache) Len() int {
c.mu.Lock()
defer c.mu.Unlock()
return c.ll.Len()
}

9
vendor/manifest vendored
View File

@@ -115,6 +115,15 @@
"branch": "master",
"path": "/linux"
},
{
"importpath": "github.com/camlistore/camlistore/pkg/lru",
"repository": "https://github.com/camlistore/camlistore",
"vcs": "git",
"revision": "f9dcdfb07a66d3cc07176b50e1a6cbee879e1b90",
"branch": "master",
"path": "/pkg/lru",
"notests": true
},
{
"importpath": "github.com/certifi/gocertifi",
"repository": "https://github.com/certifi/gocertifi",