From 2f6faf31ac637a21af0cad5d40f8e34cfd8ee676 Mon Sep 17 00:00:00 2001
From: Ritvik Rao <rsrao2@illinois.edu>
Date: Fri, 5 Sep 2025 09:25:55 -0500
Subject: [PATCH 1/2] Compile charm with CMK_LBDB_ON=0

---
 src/ck-core/ck.C           | 5 +++--
 src/ck-core/ck.h           | 2 --
 src/ck-core/cklocrec.h     | 6 +++---
 src/ck-core/ckmigratable.h | 2 +-
 src/ck-ldb/LBObj.C         | 9 ++++-----
 5 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/src/ck-core/ck.C b/src/ck-core/ck.C
index ba0bbc0b0f..fe75c4bcbf 100644
--- a/src/ck-core/ck.C
+++ b/src/ck-core/ck.C
@@ -640,16 +640,17 @@ void CkCallstackPop(Chare *obj) {
   _ckStartTiming();       // resume timing of the previous obj
 }
 
-#if CMK_LBDB_ON
+
 CkLocRec *CkActiveLocRec(void) {
+  #if CMK_LBDB_ON
   auto *obj = CkActiveObj();
   if (obj && obj->ckInitialized) {
     return obj->getCkLocRec();
   } else {
     return nullptr;
   }
+  #endif
 }
-#endif
 
 /******************** Basic support *****************/
 void CkDeliverMessageFree(int epIdx,void *msg,void *obj)
diff --git a/src/ck-core/ck.h b/src/ck-core/ck.h
index cfb7937c2c..3af9015daa 100644
--- a/src/ck-core/ck.h
+++ b/src/ck-core/ck.h
@@ -332,9 +332,7 @@ class CkCoreState {
 
 CkpvExtern(CkCoreState *, _coreState);
 
-#if CMK_LBDB_ON
 CkLocRec *CkActiveLocRec(void);
-#endif // CMK_LBDB_ON
 
 void CpdHandleLBMessage(LBMigrateMsg **msg);
 void CkMessageWatcherInit(char **argv,CkCoreState *ck);
diff --git a/src/ck-core/cklocrec.h b/src/ck-core/cklocrec.h
index 8528aafcd2..09b9d03780 100644
--- a/src/ck-core/cklocrec.h
+++ b/src/ck-core/cklocrec.h
@@ -17,15 +17,15 @@ class CkLocRec {
   CmiUInt8 id;
   bool *deletedMarker; /// Set this if we're deleted during processing
   bool running; /// True when inside a startTiming/stopTiming pair
+  CkSyncBarrier* syncBarrier;
+  LDObjHandle ldHandle;
 #if CMK_LBDB_ON
   bool  asyncMigrate;  /// if readyMove is inited
   bool  readyMigrate;    /// status whether it is ready to migrate
   bool  enable_measure;
   int  nextPe;              /// next migration dest processor
-  CkSyncBarrier* syncBarrier;
   LBManager *lbmgr;
   MetaBalancer *the_metalb;
-  LDObjHandle ldHandle;
 #endif
 
 public:
@@ -63,7 +63,6 @@ class CkLocRec {
 public:
   inline LBManager *getLBMgr(void) const {return lbmgr;}
   inline MetaBalancer *getMetaBalancer(void) const {return the_metalb;}
-  inline const LDObjHandle& getLdHandle() const{ return ldHandle; }
   static void staticMigrate(LDObjHandle h, int dest);
   static void staticMetaLBResumeWaitingChares(LDObjHandle h, int lb_ideal_period);
   static void staticMetaLBCallLBOnChares(LDObjHandle h);
@@ -80,6 +79,7 @@ class CkLocRec {
 #else
   void AsyncMigrate(bool use){};
 #endif
+  inline const LDObjHandle& getLdHandle() const{ return ldHandle; }
 };
 
 #endif // CK_LOC_REC_H
diff --git a/src/ck-core/ckmigratable.h b/src/ck-core/ckmigratable.h
index d0e9a96eeb..b21a040405 100644
--- a/src/ck-core/ckmigratable.h
+++ b/src/ck-core/ckmigratable.h
@@ -101,7 +101,7 @@ class CkMigratable : public Chare {
   void setMigratable(int migratable)  { }
   void setPupSize(size_t obj_pup_size) { }
 public:
-  void ckFinishConstruction(int epoch) { }
+  void ckFinishConstruction(int epoch = -1) { }
 #endif
 
 #if CMK_OUT_OF_CORE
diff --git a/src/ck-ldb/LBObj.C b/src/ck-ldb/LBObj.C
index 36ca87d85f..1f13e93186 100644
--- a/src/ck-ldb/LBObj.C
+++ b/src/ck-ldb/LBObj.C
@@ -4,12 +4,11 @@
 /*@{*/
 
 #include <charm++.h>
-
-#if CMK_LBDB_ON
-
 #include "LBObj.h"
 #include "LBOM.h"
 
+#if CMK_LBDB_ON
+
 /*************************************************************
  * LBObj Object-data Code
  *************************************************************/
@@ -30,6 +29,8 @@ void LBObj::Clear(void)
 #endif
 }
 
+#endif
+
 void LBObj::IncrementTime(LBRealType walltime, LBRealType cputime)
 {
   data.wallTime += walltime;
@@ -42,6 +43,4 @@ void LBObj::IncrementTime(LBRealType walltime, LBRealType cputime)
 #endif
 }
 
-#endif
-
 /*@}*/

From 5a8ee61159c3c98611167aa6ccd8d20a54f1bf0f Mon Sep 17 00:00:00 2001
From: Ritvik Rao <rsrao2@illinois.edu>
Date: Wed, 24 Sep 2025 17:30:06 -0500
Subject: [PATCH 2/2] always retrieve the location record

---
 src/ck-core/ck.C | 2 --
 1 file changed, 2 deletions(-)

diff --git a/src/ck-core/ck.C b/src/ck-core/ck.C
index fe75c4bcbf..2e602e01c8 100644
--- a/src/ck-core/ck.C
+++ b/src/ck-core/ck.C
@@ -642,14 +642,12 @@ void CkCallstackPop(Chare *obj) {
 
 
 CkLocRec *CkActiveLocRec(void) {
-  #if CMK_LBDB_ON
   auto *obj = CkActiveObj();
   if (obj && obj->ckInitialized) {
     return obj->getCkLocRec();
   } else {
     return nullptr;
   }
-  #endif
 }
 
 /******************** Basic support *****************/