Master process needs to apply cache config too.

Author: David Robertson

synapse/app/_base.py

@@ -430,6 +430,9 @@ def run_sighup(*args: Any, **kwargs: Any) -> None:
         register_sighup(refresh_certificate, hs)
         register_sighup(reload_cache_config, hs.config)
 
+    # Apply the cache config.
+    hs.config.caches.resize_all_caches()
+
     # Load the certificate from disk.
     refresh_certificate(hs)
 

synapse/app/generic_worker.py

@@ -459,7 +459,6 @@ def start(config_options: List[str]) -> None:
 
     synapse.events.USE_FROZEN_DICTS = config.server.use_frozen_dicts
     synapse.util.caches.TRACK_MEMORY_USAGE = config.caches.track_memory_usage
-    config.caches.resize_all_caches()
 
     if config.server.gc_seconds:
         synapse.metrics.MIN_TIME_BETWEEN_GCS = config.server.gc_seconds