Fix memory guard: remove RLIMIT_AS (blocks Python heap), VmRSS-only

dashboard/server.py

@@ -32,15 +32,16 @@ from common.risk import risk_summary
 from strategies.quant_report import compute_quant_report
 
 # ═══════════════════════════════════════════════════════════
-# Memory guard: cap RSS at 512MB, GC-aggressive at 256MB
+# Memory guard: check RSS via /proc, force GC at 256MB,
+# log warning at 384MB, hard exit at 512MB.
+# RLIMIT_AS disabled — Python heap needs virtual headroom.
 # ═══════════════════════════════════════════════════════════
-import resource, gc, signal
+import gc, os as _os
 
 MEM_SOFT_LIMIT = 256 * 1024 * 1024  # 256 MB — force GC
+MEM_WARN_LIMIT = 384 * 1024 * 1024  # 384 MB — log warning
 MEM_HARD_LIMIT = 512 * 1024 * 1024  # 512 MB — terminate
 
-resource.setrlimit(resource.RLIMIT_AS, (MEM_HARD_LIMIT, MEM_HARD_LIMIT))
-
 def check_memory():
     """Check RSS, force GC if over soft limit, raise if over hard limit."""
     try:
@@ -51,7 +52,7 @@ def check_memory():
                     rss = rss_kb * 1024
                     if rss > MEM_HARD_LIMIT:
                         print(f"[CRIT] RSS {rss_kb // 1024}MB > 512MB — exiting", flush=True)
-                        os._exit(1)
+                        _os._exit(1)
                     if rss > MEM_SOFT_LIMIT:
                         gc.collect()
                         gc.collect()