Fixes for PyPy compatibility (#9270)

* synapse.app.base: only call gc.freeze() on CPython

gc.freeze() is an implementation detail of CPython garbage collector,
and notably does not exist on PyPy.

Rather than playing whack-a-mole and skipping the call when under PyPy,
simply restrict it to CPython because the whole gc module is
implementation-defined.

Signed-off-by: Ivan Shapovalov <intelfx@intelfx.name>

2 files changed, 3 insertions, 1 deletions

diff --git a/changelog.d/9270.misc b/changelog.d/9270.misc
new file mode 100644

index 0000000000..908e5ee78b
--- /dev/null
+++ b/changelog.d/9270.misc
@@ -0,0 +1 @@
+Restore PyPy compatibility by not calling CPython-specific GC methods when under PyPy.
diff --git a/synapse/app/_base.py b/synapse/app/_base.py

index 395e202b89..9840a9d55b 100644
--- a/synapse/app/_base.py
+++ b/synapse/app/_base.py
@@ -16,6 +16,7 @@
 import gc
 import logging
 import os
+import platform
 import signal
 import socket
 import sys
@@ -339,7 +340,7 @@ async def start(hs: "synapse.server.HomeServer", listeners: Iterable[ListenerCon
     # rest of time. Doing so means less work each GC (hopefully).
     #
     # This only works on Python 3.7
-    if sys.version_info >= (3, 7):
+    if platform.python_implementation() == "CPython" and sys.version_info >= (3, 7):
         gc.collect()
         gc.freeze()