Various tweaks

cmd/resolve-state/main.go

@@ -7,6 +7,7 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/matrix-org/dendrite/internal/caching"
 	"github.com/matrix-org/dendrite/roomserver/state"
@@ -53,7 +54,7 @@ func main() {
 
 	fmt.Println("Fetching", len(snapshotNIDs), "snapshot NIDs")
 
-	cache, err := caching.NewRistrettoCache(128*1024*1024, true)
+	cache, err := caching.NewRistrettoCache(128*1024*1024, time.Hour, true)
 	if err != nil {
 		panic(err)
 	}

dendrite-sample.monolith.yaml

@@ -44,10 +44,18 @@ global:
   # Configuration for in-process caches, to help speed up processing transactions
   # and reducing load on the database.
   cache:
-    # The estimated maximum size for the global cache in bytes. Note that this is
+    # The estimated maximum size for the global cache in bytes, or in terabytes,
-    # not a hard limit, nor is it a memory limit for the entire process. A cache that
+    # gigabytes, megabytes or kilobytes when the appropriate 'tb', 'gb', 'mb' or
-    # is too small may end up yielding little benefit.
+    # 'kb' suffix is specified. Note that this is not a hard limit, nor is it a
-    max_bytes_est: 1073741824
+    # memory limit for the entire process. A cache that is too small may ultimately
+    # provide little or no benefit.
+    max_bytes_est: 1gb
+
+    # The maximum amount of time that a cache entry can live for in memory before
+    # it will be evicted and/or refreshed from the database. Lower values result in
+    # easier admission of new cache entries but may also increase database load in
+    # comparison to higher values, so adjust conservatively.
+    max_age: 1h
 
   # The server name to delegate server-server communications to, with optional port
   # e.g. localhost:443

dendrite-sample.polylith.yaml

@@ -34,10 +34,18 @@ global:
   # Configuration for in-process caches, to help speed up processing transactions
   # and reducing load on the database.
   cache:
-    # The estimated maximum size for the global cache in bytes. Note that this is
+    # The estimated maximum size for the global cache in bytes, or in terabytes,
-    # not a hard limit, nor is it a memory limit for the entire process. A cache that
+    # gigabytes, megabytes or kilobytes when the appropriate 'tb', 'gb', 'mb' or
-    # is too small may end up yielding little benefit.
+    # 'kb' suffix is specified. Note that this is not a hard limit, nor is it a
-    max_bytes_est: 1073741824
+    # memory limit for the entire process. A cache that is too small may ultimately
+    # provide little or no benefit.
+    max_bytes_est: 1gb
+
+    # The maximum amount of time that a cache entry can live for in memory before
+    # it will be evicted and/or refreshed from the database. Lower values result in
+    # easier admission of new cache entries but may also increase database load in
+    # comparison to higher values, so adjust conservatively.
+    max_age: 1h
 
   # The server name to delegate server-server communications to, with optional port
   # e.g. localhost:443

federationapi/federationapi_keys_test.go

@@ -64,7 +64,7 @@ func TestMain(m *testing.M) {
 			}
 
 			// Create a new cache but don't enable prometheus!
-			s.cache, err = caching.NewRistrettoCache(8*1024*1024, false)
+			s.cache, err = caching.NewRistrettoCache(8*1024*1024, time.Hour, false)
 			if err != nil {
 				panic("can't create cache: " + err.Error())
 			}

internal/caching/impl_ristretto.go

@@ -57,37 +57,37 @@ const (
 	lazyLoadingCache
 )
 
-func NewRistrettoCache(maxCost config.DataUnit, enablePrometheus bool) (*Caches, error) {
+func NewRistrettoCache(maxCost config.DataUnit, maxAge time.Duration, enablePrometheus bool) (*Caches, error) {
 	cache := MustCreateCache(maxCost, enablePrometheus)
 	return &Caches{
 		RoomVersions: &RistrettoCachePartition[string, gomatrixserverlib.RoomVersion]{
 			cache:  cache,
 			Prefix: roomVersionsCache,
-			MaxAge: time.Hour,
+			MaxAge: maxAge,
 		},
 		ServerKeys: &RistrettoCachePartition[string, gomatrixserverlib.PublicKeyLookupResult]{
 			cache:   cache,
 			Prefix:  serverKeysCache,
 			Mutable: true,
-			MaxAge:  time.Hour,
+			MaxAge:  maxAge,
 		},
 		RoomServerRoomIDs: &RistrettoCachePartition[int64, string]{
 			cache:  cache,
 			Prefix: roomIDsCache,
-			MaxAge: time.Hour,
+			MaxAge: maxAge,
 		},
 		RoomServerEvents: &RistrettoCostedCachePartition[int64, *gomatrixserverlib.Event]{
 			&RistrettoCachePartition[int64, *gomatrixserverlib.Event]{
 				cache:  cache,
 				Prefix: roomEventsCache,
-				MaxAge: time.Hour,
+				MaxAge: maxAge,
 			},
 		},
 		RoomInfos: &RistrettoCachePartition[string, types.RoomInfo]{
 			cache:   cache,
 			Prefix:  roomInfosCache,
 			Mutable: true,
-			MaxAge:  time.Hour,
+			MaxAge:  maxAge,
 		},
 		FederationPDUs: &RistrettoCostedCachePartition[int64, *gomatrixserverlib.HeaderedEvent]{
 			&RistrettoCachePartition[int64, *gomatrixserverlib.HeaderedEvent]{
@@ -109,13 +109,13 @@ func NewRistrettoCache(maxCost config.DataUnit, enablePrometheus bool) (*Caches,
 			cache:   cache,
 			Prefix:  spaceSummaryRoomsCache,
 			Mutable: true,
-			MaxAge:  time.Hour,
+			MaxAge:  maxAge,
 		},
 		LazyLoading: &RistrettoCachePartition[string, any]{ // TODO: type
 			cache:   cache,
 			Prefix:  lazyLoadingCache,
 			Mutable: true,
-			MaxAge:  time.Hour,
+			MaxAge:  maxAge,
 		},
 	}, nil
 }

roomserver/internal/input/input_test.go

@@ -48,7 +48,7 @@ func TestSingleTransactionOnInput(t *testing.T) {
 		Kind:  api.KindOutlier, // don't panic if we generate an output event
 		Event: event.Headered(gomatrixserverlib.RoomVersionV6),
 	}
-	cache, err := caching.NewRistrettoCache(8*1024*1024, false)
+	cache, err := caching.NewRistrettoCache(8*1024*1024, time.Hour, false)
 	if err != nil {
 		t.Fatal(err)
 	}

setup/base/base.go

@@ -161,7 +161,7 @@ func NewBaseDendrite(cfg *config.Dendrite, componentName string, options ...Base
 		}
 	}
 
-	cache, err := caching.NewRistrettoCache(cfg.Global.Cache.EstMaxSize, enableMetrics)
+	cache, err := caching.NewRistrettoCache(cfg.Global.Cache.EstMaxSize, cfg.Global.Cache.MaxAge, enableMetrics)
 	if err != nil {
 		logrus.WithError(err).Warnf("Failed to create cache")
 	}

setup/config/config_global.go

@@ -176,11 +176,13 @@ func (c *ServerNotices) Defaults(generate bool) {
 func (c *ServerNotices) Verify(errors *ConfigErrors, isMonolith bool) {}
 
 type Cache struct {
-	EstMaxSize DataUnit `yaml:"max_bytes_est"`
+	EstMaxSize DataUnit      `yaml:"max_bytes_est"`
+	MaxAge     time.Duration `yaml:"max_age"`
 }
 
 func (c *Cache) Defaults(generate bool) {
 	c.EstMaxSize = 1024 * 1024 * 1024 // 1GB
+	c.MaxAge = time.Hour
 }
 
 func (c *Cache) Verify(errors *ConfigErrors, isMonolith bool) {