Index: src/pager.c
==================================================================
--- src/pager.c
+++ src/pager.c
@@ -7548,11 +7548,13 @@
 
     rc = pagerOpenWal(pPager);
     if( rc==SQLITE_OK ){
       pPager->journalMode = PAGER_JOURNALMODE_WAL;
       pPager->eState = PAGER_OPEN;
+#ifdef SQLITE_SERVER_EDITION
       sqlite3WalServer(pPager->pWal, pPager->pServer);
+#endif
     }
   }else{
     *pbOpen = 1;
   }
 

Index: src/server.c
==================================================================
--- src/server.c
+++ src/server.c
@@ -91,11 +91,12 @@
 
 struct Server {
   ServerHMA *pHma;                /* Hma file object */
   int iClient;                    /* Client id */
   Pager *pPager;                  /* Associated pager object */
-
+  i64 nUsWrite;                   /* Cumulative us holding WRITER lock */
+  i64 iUsWrite;                   /* Time WRITER lock was taken */
   int nAlloc;                     /* Allocated size of aLock[] array */
   int nLock;                      /* Number of entries in aLock[] */
   u32 *aLock;                     /* Mapped lock file */
 };
 
@@ -452,10 +453,22 @@
         n = n & ((1 << HMA_CLIENT_SLOTS)-1);
       }
       n = n & ~(1 << p->iClient);
       if( __sync_val_compare_and_swap(pSlot, v, n)==v ) break;
     }
+    if( p->aLock[i]==0 ){
+      struct timeval t2;
+      i64 nUs;
+      gettimeofday(&t2, 0);
+      nUs = (i64)t2.tv_sec * 1000000 + t2.tv_usec - p->iUsWrite; 
+      p->nUsWrite += nUs;
+      if( (p->nUsWrite / 1000000)!=((p->nUsWrite + nUs)/1000000) ){
+        sqlite3_log(SQLITE_WARNING, 
+            "Cumulative WRITER time: %lldms\n", p->nUsWrite/1000
+        );
+      }
+    }
   }
   p->nLock = 0;
 #if 1
   return posixLock(p->pHma->fd, p->iClient+1, SERVER_READ_LOCK, 0);
 #endif
@@ -566,10 +579,15 @@
       assert( serverWriteLocker(v)==p->iClient );
       n = v & ((1<<HMA_CLIENT_SLOTS)-1);
     }while( __sync_val_compare_and_swap(pSlot, v, n)!=v );
   }
 
+  if( pgno==0 ){
+    struct timeval t1;
+    gettimeofday(&t1, 0);
+    p->iUsWrite = ((i64)t1.tv_sec * 1000000) + (i64)t1.tv_usec;
+  }
   assert( rc!=SQLITE_OK || sqlite3ServerHasLock(p, pgno, bWrite) );
   return rc;
 }
 
 int sqlite3ServerHasLock(Server *p, Pgno pgno, int bWrite){