From 42d539b1863c153d96f6ba7249546deb50304147 Mon Sep 17 00:00:00 2001
From: Andrea Fontana <trikkuz@gmail.com>
Date: Fri, 26 Apr 2024 14:40:08 +0200
Subject: [PATCH] set nofile limit for Docker containers

---
 source/serverino/main.d | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/source/serverino/main.d b/source/serverino/main.d
index fe6312d..2867e65 100644
--- a/source/serverino/main.d
+++ b/source/serverino/main.d
@@ -123,6 +123,20 @@ template ServerinoLoop(Modules...)
 
    int mainServerinoLoop(string[] args)
    {
+
+      // Docker container has a too generous limit of open files, it slows down the server
+      version(Posix)
+      {
+         import core.sys.posix.sys.resource : rlimit, setrlimit, getrlimit, RLIMIT_NOFILE;
+         rlimit rlim;
+         getrlimit(RLIMIT_NOFILE, &rlim);
+
+         if (rlim.rlim_cur > 65536)
+            rlim.rlim_cur = 4096;
+
+         setrlimit(RLIMIT_NOFILE, &rlim);
+      }
+
       // Enable terminal colors on older windows
       version(Windows)
       {