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Prometheus metrics for LRU cache (#1039)

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* Add prom metrics for the in-memory LRU cache

* Increase cache sizes
This commit is contained in:
Neil Alexander 2020-05-15 11:27:10 +01:00 committed by GitHub
parent 2b5052eccf
commit f0e0a6668f
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 31 additions and 5 deletions
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8
common/caching/immutablecache.go
View file

@ -1,10 +1,12 @@
package caching package caching
import "github.com/matrix-org/gomatrixserverlib" import (
"github.com/matrix-org/gomatrixserverlib"
)
const ( const (
RoomVersionMaxCacheEntries = 128 RoomVersionMaxCacheEntries = 1024
ServerKeysMaxCacheEntries = 128 ServerKeysMaxCacheEntries = 1024
) )
type ImmutableCache interface { type ImmutableCache interface {

28
common/caching/immutableinmemorylru.go
View file

@ -5,6 +5,8 @@ import (
lru "github.com/hashicorp/golang-lru" lru "github.com/hashicorp/golang-lru"
"github.com/matrix-org/gomatrixserverlib" "github.com/matrix-org/gomatrixserverlib"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
) )
type ImmutableInMemoryLRUCache struct { type ImmutableInMemoryLRUCache struct {
@ -21,10 +23,32 @@ func NewImmutableInMemoryLRUCache() (*ImmutableInMemoryLRUCache, error) {
if rvErr != nil { if rvErr != nil {
return nil, rvErr return nil, rvErr
} }
return &ImmutableInMemoryLRUCache{ cache := &ImmutableInMemoryLRUCache{
roomVersions: roomVersionCache, roomVersions: roomVersionCache,
serverKeys: serverKeysCache, serverKeys: serverKeysCache,
}, nil }
cache.configureMetrics()
return cache, nil
}
func (c *ImmutableInMemoryLRUCache) configureMetrics() {
promauto.NewGaugeFunc(prometheus.GaugeOpts{
Namespace: "dendrite",
Subsystem: "caching",
Name: "number_room_version_entries",
Help: "The number of room version entries cached.",
}, func() float64 {
return float64(c.roomVersions.Len())
})
promauto.NewGaugeFunc(prometheus.GaugeOpts{
Namespace: "dendrite",
Subsystem: "caching",
Name: "number_server_key_entries",
Help: "The number of server key entries cached.",
}, func() float64 {
return float64(c.serverKeys.Len())
})
} }
func checkForInvalidMutation(cache *lru.Cache, key string, value interface{}) { func checkForInvalidMutation(cache *lru.Cache, key string, value interface{}) {