diff --git a/src/backend/backend.c b/src/backend/backend.c
index a06bdf853..569673405 100644
--- a/src/backend/backend.c
+++ b/src/backend/backend.c
@@ -19,6 +19,7 @@
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include "common/logging.h"
 #include "lib/safeclib.h"
 
 #include "backend/backend.h"
@@ -31,20 +32,20 @@
 #include <sys/resource.h>
 
 //NOBUG_DEFINE_FLAG_PARENT (backend, lumiera); TODO
-NOBUG_DEFINE_FLAG (backend);
-NOBUG_DEFINE_FLAG_PARENT (file_all, backend);
-NOBUG_DEFINE_FLAG_PARENT (filehandle, file_all);
+//NOBUG_DEFINE_FLAG (backend);
+//NOBUG_DEFINE_FLAG_PARENT (file_all, backend);
+//NOBUG_DEFINE_FLAG_PARENT (filehandle, file_all);
 
-NOBUG_DEFINE_FLAG_PARENT (mmapings, mmap_all);
+//NOBUG_DEFINE_FLAG_PARENT (mmapings, mmap_all);
 
 
 
-NOBUG_DECLARE_FLAG (file);
+//NOBUG_DECLARE_FLAG (file);
 
-NOBUG_DECLARE_FLAG (mmap_all);
-NOBUG_DECLARE_FLAG (mmap);
-NOBUG_DECLARE_FLAG (mmapings);
-NOBUG_DECLARE_FLAG (mmapcache);
+//NOBUG_DECLARE_FLAG (mmap_all);
+//NOBUG_DECLARE_FLAG (mmap);
+//NOBUG_DECLARE_FLAG (mmapings);
+//NOBUG_DECLARE_FLAG (mmapcache);
 
 
 size_t lumiera_backend_pagesize;
@@ -52,16 +53,16 @@ size_t lumiera_backend_pagesize;
 int
 lumiera_backend_init (void)
 {
-  NOBUG_INIT_FLAG (backend);
-  NOBUG_INIT_FLAG (file_all);
-  NOBUG_INIT_FLAG (file);
-  NOBUG_INIT_FLAG (filehandle);
-  NOBUG_INIT_FLAG (mmap_all);
-  NOBUG_INIT_FLAG (mmap);
-  NOBUG_INIT_FLAG (mmapings);
-  NOBUG_INIT_FLAG (mmapcache);
+  //NOBUG_INIT_FLAG (backend);
+  //NOBUG_INIT_FLAG (file_all);
+  //NOBUG_INIT_FLAG (file);
+  //NOBUG_INIT_FLAG (filehandle);
+  //NOBUG_INIT_FLAG (mmap_all);
+  //NOBUG_INIT_FLAG (mmap);
+  //NOBUG_INIT_FLAG (mmapings);
+  //NOBUG_INIT_FLAG (mmapcache);
 
-  TRACE (backend);
+  TRACE (backend_dbg);
   lumiera_filedescriptor_registry_init ();
 
   lumiera_backend_pagesize = sysconf(_SC_PAGESIZE);
@@ -107,7 +108,7 @@ lumiera_backend_init (void)
 void
 lumiera_backend_destroy (void)
 {
-  TRACE (backend);
+  TRACE (backend_dbg);
   lumiera_mmapcache_delete ();
   lumiera_filehandlecache_delete ();
   lumiera_filedescriptor_registry_destroy ();
diff --git a/src/backend/backend.h b/src/backend/backend.h
index ded220b6e..8bfa18db5 100644
--- a/src/backend/backend.h
+++ b/src/backend/backend.h
@@ -23,7 +23,7 @@
 
 #include <nobug.h>
 
-NOBUG_DECLARE_FLAG (backend);
+//NOBUG_DECLARE_FLAG (backend);
 
 extern size_t lumiera_backend_pagesize;
 
diff --git a/src/backend/file.c b/src/backend/file.c
index b8b8ae937..ba18f93be 100644
--- a/src/backend/file.c
+++ b/src/backend/file.c
@@ -19,6 +19,7 @@
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include "common/logging.h"
 #include "lib/mutex.h"
 #include "lib/safeclib.h"
 
@@ -28,7 +29,7 @@
 #include <limits.h>
 #include <unistd.h>
 
-NOBUG_DEFINE_FLAG_PARENT (file, file_all);
+//NOBUG_DEFINE_FLAG_PARENT (file, file_all);
 
 LUMIERA_ERROR_DEFINE (FILE_CHANGED, "File changed unexpected");
 LUMIERA_ERROR_DEFINE (FILE_NOCHUNKSIZE, "Chunksize not set");
@@ -37,7 +38,7 @@ LUMIERA_ERROR_DEFINE (FILE_NOCHUNKSIZE, "Chunksize not set");
 LumieraFile
 lumiera_file_init (LumieraFile self, const char* name, int flags)
 {
-  TRACE (file);
+  TRACE (file_dbg);
 
   if (self)
     {
@@ -55,7 +56,7 @@ lumiera_file_init (LumieraFile self, const char* name, int flags)
 LumieraFile
 lumiera_file_destroy (LumieraFile self)
 {
-  TRACE (file);
+  TRACE (file_dbg);
 
   lumiera_filedescriptor_release (self->descriptor, self->name, &self->node);
   lumiera_free (self->name);
@@ -66,7 +67,9 @@ lumiera_file_destroy (LumieraFile self)
 LumieraFile
 lumiera_file_new (const char* name, int flags)
 {
-  TRACE (file);
+  TRACE (file_dbg);
+  TRACE (file, "opening file '%s' with flags '%x'", name, flags);
+
   LumieraFile self = lumiera_malloc (sizeof (lumiera_file));
   if (!lumiera_file_init (self, name, flags))
     {
@@ -80,7 +83,8 @@ lumiera_file_new (const char* name, int flags)
 void
 lumiera_file_delete (LumieraFile self)
 {
-  TRACE (file);
+  TRACE (file_dbg);
+  TRACE (file, "close file '%s'", self->name);
   lumiera_free (lumiera_file_destroy (self));
 }
 
@@ -88,7 +92,7 @@ lumiera_file_delete (LumieraFile self)
 int
 lumiera_file_handle_acquire (LumieraFile self)
 {
-  TRACE (file);
+  TRACE (file_dbg);
   REQUIRE (self);
   REQUIRE (self->descriptor);
   REQUIRE (lumiera_fhcache);
@@ -100,7 +104,7 @@ lumiera_file_handle_acquire (LumieraFile self)
 void
 lumiera_file_handle_release (LumieraFile self)
 {
-  TRACE (file);
+  TRACE (file_dbg);
   REQUIRE (self);
   REQUIRE (self->descriptor);
   REQUIRE (lumiera_fhcache);
diff --git a/src/backend/file.h b/src/backend/file.h
index dd1188e02..cafd66939 100644
--- a/src/backend/file.h
+++ b/src/backend/file.h
@@ -27,7 +27,7 @@
 #include "lib/llist.h"
 #include "lib/error.h"
 
-NOBUG_DECLARE_FLAG (file);
+//NOBUG_DECLARE_FLAG (file);
 
 LUMIERA_ERROR_DECLARE(FILE_CHANGED);
 LUMIERA_ERROR_DECLARE(FILE_NOCHUNKSIZE);
diff --git a/src/backend/filedescriptor.c b/src/backend/filedescriptor.c
index e27bf66f0..edb6afbfd 100644
--- a/src/backend/filedescriptor.c
+++ b/src/backend/filedescriptor.c
@@ -19,6 +19,7 @@
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include "common/logging.h"
 #include "lib/mutex.h"
 #include "lib/safeclib.h"
 
@@ -34,7 +35,7 @@
 #include <errno.h>
 
 
-NOBUG_DEFINE_FLAG_PARENT (filedescriptor, file_all);
+//NOBUG_DEFINE_FLAG_PARENT (filedescriptor, file_all);
 
 /*
   Filedescriptor registry
@@ -89,24 +90,24 @@ key_fn (const PSplaynode node)
 void
 lumiera_filedescriptor_registry_init (void)
 {
-  NOBUG_INIT_FLAG (filedescriptor);
-  TRACE (filedescriptor);
+  //NOBUG_INIT_FLAG (filedescriptor);
+  TRACE (filedescriptor_dbg);
   REQUIRE (!registry);
 
   registry = psplay_new (cmp_fn, key_fn, delete_fn);
   if (!registry)
     LUMIERA_DIE (NO_MEMORY);
 
-  lumiera_mutex_init (&registry_mutex, "filedescriptor_registry", &NOBUG_FLAG (filedescriptor));
+  lumiera_mutex_init (&registry_mutex, "filedescriptor_registry", &NOBUG_FLAG (mutex_dbg));
 }
 
 void
 lumiera_filedescriptor_registry_destroy (void)
 {
-  TRACE (filedescriptor);
+  TRACE (filedescriptor_dbg);
   REQUIRE (!psplay_nelements (registry));
 
-  lumiera_mutex_destroy (&registry_mutex, &NOBUG_FLAG (filedescriptor));
+  lumiera_mutex_destroy (&registry_mutex, &NOBUG_FLAG (mutex_dbg));
 
   if (registry)
     psplay_destroy (registry);
@@ -117,13 +118,13 @@ lumiera_filedescriptor_registry_destroy (void)
 LumieraFiledescriptor
 lumiera_filedescriptor_acquire (const char* name, int flags, LList filenode)
 {
-  TRACE (filedescriptor, "%s", name);
+  TRACE (filedescriptor_dbg, "%s", name);
   REQUIRE (registry, "not initialized");
   REQUIRE (llist_is_empty (filenode));
 
   LumieraFiledescriptor dest = NULL;
 
-  LUMIERA_MUTEX_SECTION (filedescriptor, &registry_mutex)
+  LUMIERA_MUTEX_SECTION (mutex_sync, &registry_mutex)
     {
       lumiera_filedescriptor fdesc;
       fdesc.flags = flags;
@@ -138,28 +139,28 @@ lumiera_filedescriptor_acquire (const char* name, int flags, LList filenode)
               while ((slash = strchr (slash+1, '/')))
                 {
                   *slash = '\0';
-                  INFO (filedescriptor, "try creating dir: %s", dir);
+                  INFO (filedescriptor_dbg, "try creating dir: %s", dir);
                   if (mkdir (dir, 0777) == -1 && errno != EEXIST)
                     {
-                      LUMIERA_ERROR_SET_CRITICAL (filedescriptor, ERRNO, name);
+                      LUMIERA_ERROR_SET_CRITICAL (file, ERRNO, name);
                       goto error;
                     }
                   *slash = '/';
                 }
               int fd;
-              INFO (filedescriptor, "try creating file: %s", name);
+              INFO (filedescriptor_dbg, "try creating file: %s", name);
               TODO ("creat mode from config");
               fd = creat (name, 0666);
               if (fd == -1)
                 {
-                  LUMIERA_ERROR_SET_CRITICAL (filedescriptor, ERRNO, name);
+                  LUMIERA_ERROR_SET_CRITICAL (file, ERRNO, name);
                   goto error;
                 }
               close (fd);
               if (stat (name, &fdesc.stat) != 0)
                 {
                   /* finally, no luck */
-                  LUMIERA_ERROR_SET_CRITICAL (filedescriptor, ERRNO, name);
+                  LUMIERA_ERROR_SET_CRITICAL (file, ERRNO, name);
                   goto error;
                 }
             }
@@ -188,10 +189,10 @@ lumiera_filedescriptor_acquire (const char* name, int flags, LList filenode)
 void
 lumiera_filedescriptor_release (LumieraFiledescriptor self, const char* name, LList filenode)
 {
-  TRACE (filedescriptor);
+  TRACE (filedescriptor_dbg);
 
   if (filenode)
-    LUMIERA_MUTEX_SECTION (filedescriptor, &self->lock)
+    LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
       {
         REQUIRE (llist_is_member (&self->files, filenode));
         llist_unlink (filenode);
@@ -205,11 +206,11 @@ lumiera_filedescriptor_release (LumieraFiledescriptor self, const char* name, LL
 int
 lumiera_filedescriptor_handle_acquire (LumieraFiledescriptor self)
 {
-  TRACE (filedescriptor);
+  TRACE (filedescriptor_dbg);
 
   int fd = -1;
 
-  LUMIERA_MUTEX_SECTION (filedescriptor, &self->lock)
+  LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
     {
       if (!self->handle)
         /* no handle yet, get a new one */
@@ -227,10 +228,10 @@ lumiera_filedescriptor_handle_acquire (LumieraFiledescriptor self)
 void
 lumiera_filedescriptor_handle_release (LumieraFiledescriptor self)
 {
-  TRACE (filedescriptor);
+  TRACE (filedescriptor_dbg);
   REQUIRE (self->handle);
 
-  LUMIERA_MUTEX_SECTION (filedescriptor, &self->lock)
+  LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
     lumiera_filehandlecache_checkin (lumiera_fhcache, self->handle);
 }
 
@@ -265,7 +266,7 @@ LumieraFiledescriptor
 lumiera_filedescriptor_new (LumieraFiledescriptor template)
 {
   LumieraFiledescriptor self = lumiera_malloc (sizeof (lumiera_filedescriptor));
-  TRACE (filedescriptor, "at %p", self);
+  TRACE (filedescriptor_dbg, "at %p", self);
 
   psplaynode_init (&self->node);
   self->stat = template->stat;
@@ -276,7 +277,7 @@ lumiera_filedescriptor_new (LumieraFiledescriptor template)
   self->mmapings = NULL;
   llist_init (&self->files);
 
-  lumiera_mutex_init (&self->lock, "filedescriptor", &NOBUG_FLAG (filedescriptor));
+  lumiera_mutex_init (&self->lock, "filedescriptor", &NOBUG_FLAG (mutex_dbg));
 
   return self;
 }
@@ -285,9 +286,9 @@ lumiera_filedescriptor_new (LumieraFiledescriptor template)
 void
 lumiera_filedescriptor_delete (LumieraFiledescriptor self, const char* name)
 {
-  TRACE (filedescriptor, "%p %s", self, name);
+  TRACE (filedescriptor_dbg, "%p %s", self, name);
 
-  LUMIERA_MUTEX_SECTION (filedescriptor, &registry_mutex)
+  LUMIERA_MUTEX_SECTION (mutex_sync, &registry_mutex)
     {
       REQUIRE (llist_is_empty (&self->files));
 
@@ -297,7 +298,7 @@ lumiera_filedescriptor_delete (LumieraFiledescriptor self, const char* name)
 
       if (self->handle && name && ((self->flags & O_RDWR) == O_RDWR))
         {
-          TRACE (filedescriptor, "truncate %s to %lld", name, self->realsize);
+          TRACE (filedescriptor_dbg, "truncate %s to %lld", name, self->realsize);
           lumiera_filehandlecache_checkout (lumiera_fhcache, self->handle);
           int dummy = ftruncate (lumiera_filehandle_handle (self->handle), self->realsize);
           (void) dummy; /* this is present to silence a warning */
@@ -309,7 +310,7 @@ lumiera_filedescriptor_delete (LumieraFiledescriptor self, const char* name)
 
       TODO ("release filehandle");
 
-      lumiera_mutex_destroy (&self->lock, &NOBUG_FLAG (filedescriptor));
+      lumiera_mutex_destroy (&self->lock, &NOBUG_FLAG (mutex_dbg));
       lumiera_free (self);
     }
 }
diff --git a/src/backend/filehandle.c b/src/backend/filehandle.c
index 86d9107f2..5aa8de6e8 100644
--- a/src/backend/filehandle.c
+++ b/src/backend/filehandle.c
@@ -19,6 +19,7 @@
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include "common/logging.h"
 #include "lib/llist.h"
 #include "lib/safeclib.h"
 
@@ -31,7 +32,7 @@
 LumieraFilehandle
 lumiera_filehandle_init (LumieraFilehandle self, LumieraFiledescriptor desc)
 {
-  TRACE (filehandle, "%p", self);
+  TRACE (filehandle_dbg, "%p", self);
   if (self)
     {
       llist_init (&self->cachenode);
@@ -54,7 +55,7 @@ lumiera_filehandle_new (LumieraFiledescriptor desc)
 void*
 lumiera_filehandle_destroy_node (LList node)
 {
-  TRACE (filehandle);
+  TRACE (filehandle_dbg);
   REQUIRE (llist_is_empty (node));
   LumieraFilehandle self = (LumieraFilehandle)node;
   REQUIRE (self->use_cnt == 0);
@@ -76,7 +77,7 @@ lumiera_filehandle_get (LumieraFilehandle self)
 int
 lumiera_filehandle_handle (LumieraFilehandle self)
 {
-  TRACE (filehandle);
+  TRACE (filehandle_dbg);
 
   int fd = -1;
   if (self->fd == -1)
@@ -85,7 +86,7 @@ lumiera_filehandle_handle (LumieraFilehandle self)
       if (fd == -1)
         {
           FIXME ("Handle EMFILE etc with the resourcecollector");
-          LUMIERA_ERROR_SET_CRITICAL (filehandle, ERRNO, lumiera_filedescriptor_name (self->descriptor));
+          LUMIERA_ERROR_SET_CRITICAL (file, ERRNO, lumiera_filedescriptor_name (self->descriptor));
         }
       else
         {
@@ -94,14 +95,14 @@ lumiera_filehandle_handle (LumieraFilehandle self)
             {
               close (fd);
               fd = -1;
-              LUMIERA_ERROR_SET_CRITICAL (filehandle, ERRNO, lumiera_filedescriptor_name (self->descriptor));
+              LUMIERA_ERROR_SET_CRITICAL (file, ERRNO, lumiera_filedescriptor_name (self->descriptor));
             }
           else if (!lumiera_filedescriptor_samestat (self->descriptor, &st))
             {
               close (fd);
               fd = -1;
               /* Woops this is not the file we expected to use */
-              LUMIERA_ERROR_SET_CRITICAL (filehandle, FILE_CHANGED, lumiera_filedescriptor_name (self->descriptor));
+              LUMIERA_ERROR_SET_CRITICAL (file, FILE_CHANGED, lumiera_filedescriptor_name (self->descriptor));
             }
         }
       self->fd = fd;
diff --git a/src/backend/filehandle.h b/src/backend/filehandle.h
index d92410a78..21d1f11ad 100644
--- a/src/backend/filehandle.h
+++ b/src/backend/filehandle.h
@@ -29,7 +29,7 @@ typedef lumiera_filehandle* LumieraFilehandle;
 
 #include "backend/filedescriptor.h"
 
-NOBUG_DECLARE_FLAG (filehandle);
+//NOBUG_DECLARE_FLAG (filehandle);
 
 /**
  * @file
diff --git a/src/backend/filehandlecache.c b/src/backend/filehandlecache.c
index fcec07202..123f8924c 100644
--- a/src/backend/filehandlecache.c
+++ b/src/backend/filehandlecache.c
@@ -19,12 +19,13 @@
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include "common/logging.h"
 #include "lib/safeclib.h"
 
 #include "backend/file.h"
 #include "backend/filehandlecache.h"
 
-NOBUG_DEFINE_FLAG_PARENT (filehandlecache, file_all);
+//NOBUG_DEFINE_FLAG_PARENT (filehandlecache, file_all);
 
 /* errors */
 
@@ -39,12 +40,12 @@ lumiera_filehandlecache_new (int max_entries)
 {
   REQUIRE (!lumiera_fhcache, "Filehandlecache already initialized");
 
-  NOBUG_INIT_FLAG (filehandlecache);
+  //NOBUG_INIT_FLAG (filehandlecache);
   lumiera_fhcache = lumiera_malloc (sizeof (lumiera_filehandlecache));
   lumiera_mrucache_init (&lumiera_fhcache->cache, lumiera_filehandle_destroy_node);
   lumiera_fhcache->available = max_entries;
   lumiera_fhcache->checked_out = 0;
-  lumiera_mutex_init (&lumiera_fhcache->lock, "filehandlecache", &NOBUG_FLAG (filehandlecache));
+  lumiera_mutex_init (&lumiera_fhcache->lock, "filehandlecache", &NOBUG_FLAG (mutex_dbg));
 }
 
 
@@ -55,7 +56,7 @@ lumiera_filehandlecache_delete (void)
     {
       REQUIRE (!lumiera_fhcache->checked_out, "Filehandles in use at shutdown");
       lumiera_mrucache_destroy (&lumiera_fhcache->cache);
-      lumiera_mutex_destroy (&lumiera_fhcache->lock, &NOBUG_FLAG (filehandlecache));
+      lumiera_mutex_destroy (&lumiera_fhcache->lock, &NOBUG_FLAG (mutex_dbg));
       lumiera_free (lumiera_fhcache);
       lumiera_fhcache = NULL;
     }
@@ -65,10 +66,10 @@ lumiera_filehandlecache_delete (void)
 LumieraFilehandle
 lumiera_filehandlecache_handle_acquire (LumieraFilehandlecache self, LumieraFiledescriptor desc)
 {
-  TRACE (filehandlecache);
+  TRACE (filehandlecache_dbg);
   LumieraFilehandle ret = NULL;
 
-  LUMIERA_MUTEX_SECTION (filehandlecache, &self->lock)
+  LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
   {
     if (self->available <= 0 && self->cache.cached)
       {
@@ -82,11 +83,11 @@ lumiera_filehandlecache_handle_acquire (LumieraFilehandlecache self, LumieraFile
     else
       {
         /* allocate new filehandle if we are below the limit or no cached handles are available (overallocating) */
-        NOTICE (filehandlecache, "overallocating filehandle");
+        NOTICE (file, "overallocating filehandle");
         ret = lumiera_filehandle_new (desc);
         TODO ("use resourcecollector here");
         if (!ret)
-          LUMIERA_ERROR_SET_ALERT (filehandlecache, FILEHANDLECACHE_NOHANDLE, lumiera_filedescriptor_name (desc));
+          LUMIERA_ERROR_SET_ALERT (file, FILEHANDLECACHE_NOHANDLE, lumiera_filedescriptor_name (desc));
         else
           --self->available;
       }
@@ -106,7 +107,7 @@ lumiera_filehandlecache_checkout (LumieraFilehandlecache self, LumieraFilehandle
   if (!handle->use_cnt)
     {
       /* lock cache and checkout */
-      LUMIERA_MUTEX_SECTION (filehandlecache, &self->lock)
+      LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
         {
           lumiera_mrucache_checkout (&self->cache, &handle->cachenode);
         }
@@ -129,7 +130,7 @@ lumiera_filehandlecache_checkin (LumieraFilehandlecache self, LumieraFilehandle
   if (!--handle->use_cnt)
     {
       /* lock cache and checin */
-      LUMIERA_MUTEX_SECTION (filehandlecache, &self->lock)
+      LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
         {
           --self->checked_out;
           lumiera_mrucache_checkin (&self->cache, &handle->cachenode);
diff --git a/src/backend/mmap.c b/src/backend/mmap.c
index d06c8effb..e10d3d664 100644
--- a/src/backend/mmap.c
+++ b/src/backend/mmap.c
@@ -19,6 +19,7 @@
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include "common/logging.h"
 #include "lib/safeclib.h"
 
 #include "backend/mmap.h"
@@ -34,8 +35,8 @@
  *
  */
 
-NOBUG_DEFINE_FLAG_PARENT (mmap_all, backend);
-NOBUG_DEFINE_FLAG_PARENT (mmap, mmap_all);
+//NOBUG_DEFINE_FLAG_PARENT (mmap_all, backend);
+//NOBUG_DEFINE_FLAG_PARENT (mmap, mmap_all);
 
 
 LUMIERA_ERROR_DEFINE (MMAP_NWRITE, "Backing file not writable");
@@ -51,7 +52,7 @@ LUMIERA_ERROR_DEFINE (MMAP_SPACE, "Address space exhausted");
 LumieraMMap
 lumiera_mmap_init (LumieraMMap self, LumieraFile file, off_t start, size_t size)
 {
-  TRACE (mmap);
+  TRACE (mmap_dbg);
 
   REQUIRE (self);
   REQUIRE (file);
@@ -80,7 +81,7 @@ lumiera_mmap_init (LumieraMMap self, LumieraFile file, off_t start, size_t size)
   LumieraFiledescriptor descriptor = file->descriptor;
 
   int fd = lumiera_file_handle_acquire (file);
-  TRACE (mmap, "got fd %d", fd);
+  TRACE (mmap_dbg, "got fd %d", fd);
   if (fd == -1)
     goto efile;
 
@@ -128,7 +129,7 @@ lumiera_mmap_init (LumieraMMap self, LumieraFile file, off_t start, size_t size)
       switch (strategy++)
         {
         case FIRST_TRY:
-          TRACE (mmap, "FIRST_TRY");
+          TRACE (mmap_dbg, "FIRST_TRY");
           /* align begin and end to chunk boundaries */
           begin = start & ~(chunksize-1);
           length = ((start+size+chunksize-1) & ~(chunksize-1)) - begin;
@@ -159,17 +160,17 @@ lumiera_mmap_init (LumieraMMap self, LumieraFile file, off_t start, size_t size)
           break;
 
         case DROP_FROM_CACHE:
-          TRACE (mmap, "drop a mapping from cache");
+          TRACE (mmap_dbg, "drop a mapping from cache");
           UNIMPLEMENTED ("mmap cache drop");
           break;
 
         case REDUCE_WINDOW:
-          NOTICE (mmap, "mmaping window reduced to NN MB");
+          NOTICE (mmap_dbg, "mmaping window reduced to NN MB");
           UNIMPLEMENTED ("mmap window reduce");
           break;
 
         case REDUCE_IN_USE:
-          NOTICE (mmap, "reduce mmapings in use");
+          NOTICE (mmap_dbg, "reduce mmapings in use");
           UNIMPLEMENTED ("mmapings in use reduce");
           break;
 
@@ -185,7 +186,7 @@ lumiera_mmap_init (LumieraMMap self, LumieraFile file, off_t start, size_t size)
                    fd,
                    begin);
 
-      INFO_IF (addr==(void*)-1, mmap, "mmap failed %s", strerror (errno));
+      INFO_IF (addr==(void*)-1, mmap_dbg, "mmap failed %s", strerror (errno));
       ENSURE (errno == 0 || errno == ENOMEM, "unexpected mmap error %s", strerror (errno));
     }
 
@@ -213,7 +214,7 @@ lumiera_mmap_init (LumieraMMap self, LumieraFile file, off_t start, size_t size)
 LumieraMMap
 lumiera_mmap_new (LumieraFile file, off_t start, size_t size)
 {
-  TRACE (mmap);
+  TRACE (mmap_dbg);
 
   LumieraMMap self = lumiera_mmapcache_mmap_acquire (lumiera_mcache);
 
@@ -230,7 +231,7 @@ lumiera_mmap_new (LumieraFile file, off_t start, size_t size)
 void
 lumiera_mmap_delete (LumieraMMap self)
 {
-  TRACE (mmap);
+  TRACE (mmap_dbg);
   if (self)
     {
       lumiera_mmapcache_forget (lumiera_mcache, self);
@@ -238,7 +239,7 @@ lumiera_mmap_delete (LumieraMMap self)
       /* The matching mappings->lock must be hold or being irrelevant (mappings destructor) here, we can't asset this from here, good luck */
       llist_unlink (&self->searchnode);
 
-      TRACE (mmap, "unmap at %p with size %zd", self->address, self->size);
+      TRACE (mmap_dbg, "unmap at %p with size %zd", self->address, self->size);
       munmap (self->address, self->size);
       lumiera_free (self->refmap);
       lumiera_free (self);
@@ -249,7 +250,7 @@ lumiera_mmap_delete (LumieraMMap self)
 void*
 lumiera_mmap_destroy_node (LList node)
 {
-  TRACE (mmap);
+  TRACE (mmap_dbg);
   REQUIRE (llist_is_empty (node));
   LumieraMMap self = (LumieraMMap)node;
 
diff --git a/src/backend/mmap.h b/src/backend/mmap.h
index 311b323f4..2bd9db7c2 100644
--- a/src/backend/mmap.h
+++ b/src/backend/mmap.h
@@ -36,7 +36,7 @@ typedef lumiera_mmap* LumieraMMap;
 #include <nobug.h>
 #include <sys/mman.h>
 
-NOBUG_DECLARE_FLAG (mmap);
+//NOBUG_DECLARE_FLAG (mmap);
 
 
 /**
diff --git a/src/backend/mmapcache.c b/src/backend/mmapcache.c
index ea1d7dac3..2510ead0b 100644
--- a/src/backend/mmapcache.c
+++ b/src/backend/mmapcache.c
@@ -19,6 +19,7 @@
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include "common/logging.h"
 #include "lib/safeclib.h"
 
 #include "backend/mmapcache.h"
@@ -28,7 +29,7 @@
  *
  */
 
-NOBUG_DEFINE_FLAG_PARENT (mmapcache, mmap_all);
+//NOBUG_DEFINE_FLAG_PARENT (mmapcache, mmap_all);
 
 LumieraMMapcache lumiera_mcache = NULL;
 
@@ -36,7 +37,7 @@ LumieraMMapcache lumiera_mcache = NULL;
 void
 lumiera_mmapcache_new (size_t limit)
 {
-  TRACE (mmapcache);
+  TRACE (mmapcache_dbg);
   lumiera_mcache = lumiera_malloc (sizeof (*lumiera_mcache));
 
   lumiera_mrucache_init (&lumiera_mcache->cache, lumiera_mmap_destroy_node);
@@ -45,19 +46,19 @@ lumiera_mmapcache_new (size_t limit)
   lumiera_mcache->total = 0;
   lumiera_mcache->cached = 0;
 
-  lumiera_mutex_init (&lumiera_mcache->lock, "mmapcache", &NOBUG_FLAG (mmapcache));
+  lumiera_mutex_init (&lumiera_mcache->lock, "mmapcache", &NOBUG_FLAG (mutex_dbg));
 }
 
 
 void
 lumiera_mmapcache_delete (void)
 {
-  TRACE (mmapcache);
+  TRACE (mmapcache_dbg);
   if (lumiera_mcache)
     {
       REQUIRE (lumiera_mcache->total == lumiera_mcache->cached, "MMaps still checked out at shutdown");
       lumiera_mrucache_destroy (&lumiera_mcache->cache);
-      lumiera_mutex_destroy (&lumiera_mcache->lock, &NOBUG_FLAG (mmapcache));
+      lumiera_mutex_destroy (&lumiera_mcache->lock, &NOBUG_FLAG (mutex_dbg));
       free (lumiera_mcache);
       lumiera_mcache = NULL;
     }
@@ -67,10 +68,10 @@ lumiera_mmapcache_delete (void)
 void*
 lumiera_mmapcache_mmap_acquire (LumieraMMapcache self)
 {
-  TRACE (mmapcache);
+  TRACE (mmapcache_dbg);
   void* map = NULL;
 
-  LUMIERA_MUTEX_SECTION (mmapcache, &self->lock)
+  LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
     {
       map = lumiera_mrucache_pop (&self->cache);
     }
@@ -78,11 +79,11 @@ lumiera_mmapcache_mmap_acquire (LumieraMMapcache self)
   if (!map)
     {
       map = lumiera_malloc (sizeof (*self));
-      TRACE (mmapcache, "allocated new mmap");
+      TRACE (mmapcache_dbg, "allocated new mmap");
     }
   else
     {
-      TRACE (mmapcache, "poped mmap from cache");
+      TRACE (mmapcache_dbg, "poped mmap from cache");
     }
 
   return map;
@@ -92,8 +93,8 @@ lumiera_mmapcache_mmap_acquire (LumieraMMapcache self)
 void
 lumiera_mmapcache_announce (LumieraMMapcache self, LumieraMMap map)
 {
-  TRACE (mmapcache);
-  LUMIERA_MUTEX_SECTION (mmapcache, &self->lock)
+  TRACE (mmapcache_dbg);
+  LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
     {
       self->total += map->size;
     }
@@ -103,8 +104,8 @@ lumiera_mmapcache_announce (LumieraMMapcache self, LumieraMMap map)
 void
 lumiera_mmapcache_forget (LumieraMMapcache self, LumieraMMap map)
 {
-  TRACE (mmapcache);
-  LUMIERA_MUTEX_SECTION (mmapcache, &self->lock)
+  TRACE (mmapcache_dbg);
+  LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
     {
       if (!llist_is_empty (&map->cachenode))
         {
@@ -120,7 +121,7 @@ lumiera_mmapcache_forget (LumieraMMapcache self, LumieraMMap map)
 int
 lumiera_mmapcache_age (LumieraMMapcache self)
 {
-  TRACE (mmapcache);
+  TRACE (mmapcache_dbg);
   int ret = 0;
 
   LUMIERA_MUTEX_SECTION (mmapcache, &self->lock)
@@ -135,9 +136,9 @@ lumiera_mmapcache_age (LumieraMMapcache self)
 LumieraMMap
 lumiera_mmapcache_checkout (LumieraMMapcache self, LumieraMMap handle)
 {
-  TRACE (mmapcache);
+  TRACE (mmapcache_dbg);
 
-  LUMIERA_MUTEX_SECTION (mmapcache, &self->lock)
+  LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
     {
       TODO ("cached stats");
       lumiera_mrucache_checkout (&self->cache, &handle->cachenode);
@@ -151,9 +152,9 @@ lumiera_mmapcache_checkout (LumieraMMapcache self, LumieraMMap handle)
 void
 lumiera_mmapcache_checkin (LumieraMMapcache self, LumieraMMap handle)
 {
-  TRACE (mmapcache);
+  TRACE (mmapcache_dbg);
 
-  LUMIERA_MUTEX_SECTION (mmapcache, &self->lock)
+  LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
     {
       TODO ("cached stats");
       --handle->refcnt;
diff --git a/src/backend/mmapings.c b/src/backend/mmapings.c
index b36d77d62..88e6cab3e 100644
--- a/src/backend/mmapings.c
+++ b/src/backend/mmapings.c
@@ -19,6 +19,7 @@
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include "common/logging.h"
 #include "lib/mutex.h"
 #include "lib/safeclib.h"
 
@@ -36,14 +37,14 @@
 LumieraMMapings
 lumiera_mmapings_init (LumieraMMapings self, LumieraFile file, size_t chunksize)
 {
-  TRACE (mmapings);
+  TRACE (mmapings_dbg);
   REQUIRE (!file->descriptor->mmapings);
 
   llist_init (&self->mmaps);
   self->descriptor = file->descriptor;
   self->chunksize = chunksize;
 
-  lumiera_mutex_init (&self->lock, "mmapings", &NOBUG_FLAG(mmapings));
+  lumiera_mutex_init (&self->lock, "mmapings", &NOBUG_FLAG(mutex_dbg));
 
   return self;
 }
@@ -52,7 +53,7 @@ lumiera_mmapings_init (LumieraMMapings self, LumieraFile file, size_t chunksize)
 LumieraMMapings
 lumiera_mmapings_destroy (LumieraMMapings self)
 {
-  TRACE (mmapings);
+  TRACE (mmapings_dbg);
   if (!self)
     return NULL;
 
@@ -62,7 +63,7 @@ lumiera_mmapings_destroy (LumieraMMapings self)
       lumiera_mmap_delete (mmap);
     }
 
-  lumiera_mutex_destroy (&self->lock, &NOBUG_FLAG(mmapings));
+  lumiera_mutex_destroy (&self->lock, &NOBUG_FLAG(mutex_dbg));
 
   return self;
 }
@@ -71,6 +72,7 @@ lumiera_mmapings_destroy (LumieraMMapings self)
 LumieraMMapings
 lumiera_mmapings_new (LumieraFile file, size_t chunksize)
 {
+  TRACE (mmapings_dbg);
   LumieraMMapings self = lumiera_malloc (sizeof (*self));
   return lumiera_mmapings_init (self, file, chunksize);
 }
@@ -79,7 +81,7 @@ lumiera_mmapings_new (LumieraFile file, size_t chunksize)
 void
 lumiera_mmapings_delete (LumieraMMapings self)
 {
-  TRACE (mmapings);
+  TRACE (mmapings_dbg);
   free (lumiera_mmapings_destroy (self));
 }
 
@@ -87,11 +89,11 @@ lumiera_mmapings_delete (LumieraMMapings self)
 LumieraMMap
 lumiera_mmapings_mmap_acquire (LumieraMMapings self, LumieraFile file, LList acquirer, off_t start, size_t size)
 {
-  TRACE (mmapings);
+  TRACE (mmapings_dbg);
 
   LumieraMMap ret = NULL;
 
-  LUMIERA_MUTEX_SECTION (mmapings, &self->lock)
+  LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
     {
       REQUIRE (llist_is_empty (acquirer));
 
@@ -119,7 +121,7 @@ lumiera_mmapings_mmap_acquire (LumieraMMapings self, LumieraFile file, LList acq
       else
         {
           /* create new mmap */
-          TRACE (mmapings, "mmap not found, creating", mmap);
+          TRACE (mmapings_dbg, "mmap not found, creating", mmap);
           ret = lumiera_mmap_new (file, start, size);
 
           llist_insert_head (&self->mmaps, &ret->searchnode);
@@ -137,13 +139,14 @@ lumiera_mmapings_mmap_acquire (LumieraMMapings self, LumieraFile file, LList acq
 void
 lumiera_mmapings_release_mmap (LumieraMMapings self, LList acquirer, LumieraMMap map)
 {
-  TRACE (mmapings);
-  LUMIERA_MUTEX_SECTION (mmapings, &self->lock)
+  TRACE (mmapings_dbg);
+
+  LUMIERA_MUTEX_SECTION (mutex_sync, &self->lock)
     {
       llist_unlink (acquirer);
       if (llist_is_empty (&map->cachenode))
         {
-          TRACE (mmapings, "checkin");
+          TRACE (mmapcache_dbg, "checkin");
           lumiera_mmapcache_checkin (lumiera_mcache, map);
         }
     }
diff --git a/src/backend/mmapings.h b/src/backend/mmapings.h
index 17548f1a9..1e21d03d3 100644
--- a/src/backend/mmapings.h
+++ b/src/backend/mmapings.h
@@ -34,7 +34,7 @@ typedef lumiera_mmapings* LumieraMMapings;
 
 #include <nobug.h>
 
-NOBUG_DECLARE_FLAG (mmapings);
+//NOBUG_DECLARE_FLAG (mmapings);
 
 /**
  * @file
diff --git a/src/backend/thread-wrapper.hpp b/src/backend/thread-wrapper.hpp
index 3c60cda09..9847b6c2e 100644
--- a/src/backend/thread-wrapper.hpp
+++ b/src/backend/thread-wrapper.hpp
@@ -25,7 +25,7 @@
 #define LIB_THREADWRAPPER_H
 
 
-#include "include/nobugcfg.h"
+#include "common/logging.h"
 #include "lib/sync.hpp"
 
 extern "C" {
@@ -74,7 +74,7 @@ namespace lib {
       static void
       run (void* arg)
         { 
-          ASSERT (arg);
+          REQUIRE (arg);
           Thread* startingWrapper = reinterpret_cast<Thread*>(arg);
           Operation _doIt_(startingWrapper->operation_);
           {
@@ -88,7 +88,7 @@ namespace lib {
       
       
     public:
-      Thread (Literal& purpose, Operation const& operation, struct nobug_flag *logging_flag = &NOBUG_FLAG(operate))
+      Thread (Literal& purpose, Operation const& operation, struct nobug_flag *logging_flag = &NOBUG_FLAG(thread))
         : started_(false),
           operation_(operation)
         {
diff --git a/src/backend/threads.c b/src/backend/threads.c
index d0feec9b8..794d13b79 100644
--- a/src/backend/threads.c
+++ b/src/backend/threads.c
@@ -36,7 +36,7 @@
  *
  */
 
-NOBUG_DEFINE_FLAG_PARENT (threads, lumiera); /*TODO insert a suitable/better parent flag here */
+//NOBUG_DEFINE_FLAG_PARENT (threads, lumiera); /*TODO insert a suitable/better parent flag here */
 
 
 //code goes here//