File 0670-erlc-Lower-default-number-of-ports-processes-when-st.patch of Package erlang

From cc9e99f9fb48d24a286ea818f3ff03afdc0b547b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Tue, 11 Nov 2025 06:03:25 +0100
Subject: [PATCH] erlc: Lower default number of ports/processes when starting
 erl

The default limit for the number of ports is quite high (currently
65536 on Unix systems and 8192 on Windows). To avoid wasting memory,
lower the limit for both ports and processes.

Just to be on the safe side, when spawning a compile server, don't
lower the limit.
---
 erts/etc/common/erlc.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/erts/etc/common/erlc.c b/erts/etc/common/erlc.c
index b89afed79a..00ca554e30 100644
--- a/erts/etc/common/erlc.c
+++ b/erts/etc/common/erlc.c
@@ -296,6 +296,12 @@ int main(int argc, char** argv)
 
     PUSH("+sbtu");
     PUSH("+A0");
+
+    /* Avoid wasting memory for processes and ports that will never be
+     * used. */
+    PUSH2("+P", "65536");
+    PUSH2("+Q", "1024");
+
     PUSH("-noinput");
     PUSH2("-mode", "minimal");
     PUSH2("-boot", "no_dot_erlang");
@@ -960,7 +966,13 @@ start_compile_server(char* node_name, char** argv)
     char* progname = argv[0];
 
     while (strcmp(argv[0], "-mode") != 0) {
-        eargv[eargc++] = *argv++;
+        if (strcmp(argv[0], "+P") == 0 || strcmp(argv[0], "+Q") == 0) {
+            /* We don't want to limit the number of ports and
+             * processes for the compile server. */
+            argv += 2;
+        } else {
+            eargv[eargc++] = *argv++;
+        }
     }
     PUSH2("-boot", "no_dot_erlang");
     PUSH2("-sname", node_name);
-- 
2.51.0