From 6961a39cd20a63116bb562d61472c31f28ea8738 Mon Sep 17 00:00:00 2001
From: txtsd <code@ihavea.quest>
Date: Fri, 4 Nov 2022 11:58:58 +0530
Subject: [PATCH] feat: Assign java max mem based on system RAM

If the system has <6GB RAM, it uses (system RAM / 1.5)
If the system has >=6GB, it uses 4GB

Signed-off-by: txtsd <code@ihavea.quest>
---
 launcher/Application.cpp | 16 +++++++++++++++-
 launcher/Application.h   |  2 ++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/launcher/Application.cpp b/launcher/Application.cpp
index 5772d7cad..c3c76854c 100644
--- a/launcher/Application.cpp
+++ b/launcher/Application.cpp
@@ -566,7 +566,7 @@ Application::Application(int &argc, char **argv) : QApplication(argc, argv)
 
         // Memory
         m_settings->registerSetting({"MinMemAlloc", "MinMemoryAlloc"}, 512);
-        m_settings->registerSetting({"MaxMemAlloc", "MaxMemoryAlloc"}, 4096);
+        m_settings->registerSetting({"MaxMemAlloc", "MaxMemoryAlloc"}, suitableMaxMem());
         m_settings->registerSetting("PermGen", 128);
 
         // Java Settings
@@ -1633,3 +1633,17 @@ QString Application::getUserAgentUncached()
 
     return BuildConfig.USER_AGENT_UNCACHED;
 }
+
+int Application::suitableMaxMem()
+{
+    float totalRAM = (float)Sys::getSystemRam() / (float)Sys::mebibyte;
+    int maxMemoryAlloc;
+
+    // If totalRAM < 6GB, use (totalRAM / 1.5), else 4GB
+    if (totalRAM < (4096 * 1.5))
+        maxMemoryAlloc = (int) (totalRAM / 1.5);
+    else
+        maxMemoryAlloc = 4096;
+
+    return maxMemoryAlloc;
+}
diff --git a/launcher/Application.h b/launcher/Application.h
index 8fa0ab10e..280c842fc 100644
--- a/launcher/Application.h
+++ b/launcher/Application.h
@@ -198,6 +198,8 @@ public:
 
     void ShowGlobalSettings(class QWidget * parent, QString open_page = QString());
 
+    int suitableMaxMem();
+
 signals:
     void updateAllowedChanged(bool status);
     void globalSettingsAboutToOpen();