From db6dbb04d3ed3bab98808319390006d66a5b5c43 Mon Sep 17 00:00:00 2001
From: Pathompum Jirakarnpaisan <107536914+Saannddy@users.noreply.github.com>
Date: Thu, 12 Mar 2026 03:43:05 +0700
Subject: [PATCH] perf: Optimize Java compilation and execution startup by
 adding JVM arguments to `javac` and `java` commands.

---
 src/core/executor.py | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/core/executor.py b/src/core/executor.py
index 3513120..b791ef1 100644
--- a/src/core/executor.py
+++ b/src/core/executor.py
@@ -122,13 +122,28 @@ def _run_java(code, tests=None, timeout=None):
             f.write(code)
             
         try:
-            comp = subprocess.run(["javac", src, "-d", d], capture_output=True, text=True, timeout=max(timeout, 10), cwd=d)
+            # Added JVM args to javac to speed up its own startup time
+            comp = subprocess.run([
+                "javac", 
+                "-J-XX:+TieredCompilation", 
+                "-J-XX:TieredStopAtLevel=1", 
+                src, "-d", d
+            ], capture_output=True, text=True, timeout=max(timeout, 10), cwd=d)
             if comp.returncode:
                 return {"status": "incorrect", "message": "Compilation failed", "compiler_output": comp.stderr}
         except subprocess.TimeoutExpired:
             return {"status": "error", "message": "Compilation timed out"}
             
-        cmd = ["java", "-cp", d, f"-Xmx{MAX_MEMORY_MB}m", class_name]
+        # Optimized JVM startup arguments
+        cmd = [
+            "java", 
+            "-cp", d, 
+            f"-Xmx{MAX_MEMORY_MB}m", 
+            "-XX:+TieredCompilation", 
+            "-XX:TieredStopAtLevel=1", 
+            "-noverify",
+            class_name
+        ]
         if tests is None:
             try:
                 res = subprocess.run(