make this a bit better

synapse/app/homeserver.py

@@ -406,6 +406,13 @@ class SynapseService(service.Service):
 
 
 def run(hs):
+
+    import tracemalloc
+    import gc
+
+    snapshots = []
+    snapshots.append(tracemalloc.take_snapshot())
+
     PROFILE_SYNAPSE = False
     if PROFILE_SYNAPSE:
         def profile(func):
@@ -568,6 +575,19 @@ def run(hs):
     if hs.config.daemonize and hs.config.print_pidfile:
         print(hs.config.pid_file)
 
+
+    def collect_stats():
+        gc.collect()
+        new = tracemalloc.take_snapshot()
+        stats = new.compare_to(snapshots[0], 'lineno')
+
+        for stat in stats[:10]:
+            print("{} new KiB {} total KiB {} new {} total memory blocks: ".format(stat.size_diff/1024, stat.size / 1024, stat.count_diff ,stat.count))
+            for line in stat.traceback.format():
+                print(line)
+
+    clock.looping_call(collect_stats, 60*1000)
+
     _base.start_reactor(
         "synapse-homeserver",
         hs.config.soft_file_limit,
@@ -586,6 +606,5 @@ def main():
         hs = setup(sys.argv[1:])
         run(hs)
 
-
 if __name__ == '__main__':
     main()