--- loncom/lonnet/perl/lonnet.pm	2016/08/25 08:09:34	1.1318
+++ loncom/lonnet/perl/lonnet.pm	2016/08/31 21:50:42	1.1319
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.1318 2016/08/25 08:09:34 droeschl Exp $
+# $Id: lonnet.pm,v 1.1319 2016/08/31 21:50:42 damieng Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -2635,21 +2635,23 @@ sub make_key {
 sub devalidate_cache_new {
     my ($name,$id,$debug) = @_;
     if ($debug) { &Apache::lonnet::logthis("deleting $name:$id"); }
+    my $remembered_id=$name.':'.$id;
     $id=&make_key($name,$id);
     $memcache->delete($id);
-    delete($remembered{$id});
-    delete($accessed{$id});
+    delete($remembered{$remembered_id});
+    delete($accessed{$remembered_id});
 }
 
 sub is_cached_new {
     my ($name,$id,$debug) = @_;
-    $id=&make_key($name,$id);
-    if (exists($remembered{$id})) {
-	if ($debug) { &Apache::lonnet::logthis("Early return $id of $remembered{$id} "); }
-	$accessed{$id}=[&gettimeofday()];
+    my $remembered_id=$name.':'.$id; # this is to avoid make_key (which is slow) whenever possible
+    if (exists($remembered{$remembered_id})) {
+	if ($debug) { &Apache::lonnet::logthis("Early return $remembered_id of $remembered{$remembered_id} "); }
+	$accessed{$remembered_id}=[&gettimeofday()];
 	$hits++;
-	return ($remembered{$id},1);
+	return ($remembered{$remembered_id},1);
     }
+    $id=&make_key($name,$id);
     my $value = $memcache->get($id);
     if (!(defined($value))) {
 	if ($debug) { &Apache::lonnet::logthis("getting $id is not defined"); }
@@ -2659,13 +2661,14 @@ sub is_cached_new {
 	if ($debug) { &Apache::lonnet::logthis("getting $id is __undef__"); }
 	$value=undef;
     }
-    &make_room($id,$value,$debug);
+    &make_room($remembered_id,$value,$debug);
     if ($debug) { &Apache::lonnet::logthis("getting $id is $value"); }
     return ($value,1);
 }
 
 sub do_cache_new {
     my ($name,$id,$value,$time,$debug) = @_;
+    my $remembered_id=$name.':'.$id;
     $id=&make_key($name,$id);
     my $setvalue=$value;
     if (!defined($setvalue)) {
@@ -2681,17 +2684,17 @@ sub do_cache_new {
 	$memcache->disconnect_all();
     }
     # need to make a copy of $value
-    &make_room($id,$value,$debug);
+    &make_room($remembered_id,$value,$debug);
     return $value;
 }
 
 sub make_room {
-    my ($id,$value,$debug)=@_;
+    my ($remembered_id,$value,$debug)=@_;
 
-    $remembered{$id}= (ref($value)) ? &Storable::dclone($value)
+    $remembered{$remembered_id}= (ref($value)) ? &Storable::dclone($value)
                                     : $value;
     if ($to_remember<0) { return; }
-    $accessed{$id}=[&gettimeofday()];
+    $accessed{$remembered_id}=[&gettimeofday()];
     if (scalar(keys(%remembered)) <= $to_remember) { return; }
     my $to_kick;
     my $max_time=0;