From e6f67cc25941bef6496e9f24dba1a6ecab2f63ad Mon Sep 17 00:00:00 2001
From: Martin Weinelt <hexa@darmstadt.ccc.de>
Date: Mon, 30 Dec 2024 17:29:02 +0100
Subject: [PATCH] nixos/matrix-synapse: configure PYTHONMALLOC when using
 jemalloc

Per a synapse FAQ entry[1] this should be set in combination with\
jemalloc to make sure that jemalloc can accurately calculate memory
usage.

[1] https://github.com/element-hq/synapse/blob/develop/docs/usage/administration/admin_faq.md#help-synapse-is-slow-and-eats-all-my-ramcpu
---
 nixos/modules/services/matrix/synapse.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/nixos/modules/services/matrix/synapse.nix b/nixos/modules/services/matrix/synapse.nix
index 2b0eb43605d8..5ed02623953d 100644
--- a/nixos/modules/services/matrix/synapse.nix
+++ b/nixos/modules/services/matrix/synapse.nix
@@ -1462,6 +1462,7 @@ in
         baseServiceConfig = {
           environment = optionalAttrs (cfg.withJemalloc) {
             LD_PRELOAD = "${pkgs.jemalloc}/lib/libjemalloc.so";
+            PYTHONMALLOC = "malloc";
           };
           serviceConfig = {
             Type = "notify";