Optionally track memory usage of each LruCache (#9881)

This will double count slightly in the presence of interned strings. It's off by default as it can consume a lot of resources.

2 files changed, 2 insertions, 0 deletions

diff --git a/synapse/app/generic_worker.py b/synapse/app/generic_worker.py

index a3fe9a3f38..f730cdbd78 100644
--- a/synapse/app/generic_worker.py
+++ b/synapse/app/generic_worker.py
@@ -454,6 +454,7 @@ def start(config_options):
         config.server.update_user_directory = False
 
     synapse.events.USE_FROZEN_DICTS = config.use_frozen_dicts
+    synapse.util.caches.TRACK_MEMORY_USAGE = config.caches.track_memory_usage
 
     if config.server.gc_seconds:
         synapse.metrics.MIN_TIME_BETWEEN_GCS = config.server.gc_seconds
diff --git a/synapse/app/homeserver.py b/synapse/app/homeserver.py

index 6a823da10d..b2501ee4d7 100644
--- a/synapse/app/homeserver.py
+++ b/synapse/app/homeserver.py
@@ -341,6 +341,7 @@ def setup(config_options):
         sys.exit(0)
 
     events.USE_FROZEN_DICTS = config.use_frozen_dicts
+    synapse.util.caches.TRACK_MEMORY_USAGE = config.caches.track_memory_usage
 
     if config.server.gc_seconds:
         synapse.metrics.MIN_TIME_BETWEEN_GCS = config.server.gc_seconds