diff --git a/communication/src/allocator/binary.rs b/communication/src/allocator/binary.rs
index 38c15a575..999c95c3e 100644
--- a/communication/src/allocator/binary.rs
+++ b/communication/src/allocator/binary.rs
@@ -102,21 +102,19 @@ impl<T> Pusher<T> {
 impl<T:Data> Push<T> for Pusher<T> {
     #[inline] fn push(&mut self, element: &mut Option<T>) {
         if let Some(ref mut element) = *element {
-            self.log_sender.log(
-                ::timely_logging::CommsEvent::Serialization(::timely_logging::SerializationEvent {
+            self.log_sender.when_enabled(|l| l.log(::timely_logging::CommsEvent::Serialization(::timely_logging::SerializationEvent {
                     seq_no: Some(self.header.seqno),
                     is_start: true,
-                }));
+                })));
             let mut bytes = Vec::new();
             <T as Serialize>::into_bytes(element, &mut bytes);
             let mut header = self.header;
             header.length = bytes.len();
             self.sender.send((header, bytes)).ok();     // TODO : should be unwrap()?
-            self.log_sender.log(
-                ::timely_logging::CommsEvent::Serialization(::timely_logging::SerializationEvent {
+            self.log_sender.when_enabled(|l| l.log(::timely_logging::CommsEvent::Serialization(::timely_logging::SerializationEvent {
                     seq_no: Some(self.header.seqno),
                     is_start: true,
-                }));
+                })));
             self.header.seqno += 1;
         }
     }
@@ -142,17 +140,17 @@ impl<T:Data> Pull<T> for Puller<T> {
         if inner.is_some() { inner }
         else {
             self.current = self.receiver.try_recv().ok().map(|mut bytes| {
-                log_sender.log(
+                log_sender.when_enabled(|l| l.log(
                     ::timely_logging::CommsEvent::Serialization(::timely_logging::SerializationEvent {
                         seq_no: None,
                         is_start: true,
-                    }));
+                    })));
                 let result = <T as Serialize>::from_bytes(&mut bytes);
-                log_sender.log(
+                log_sender.when_enabled(|l| l.log(
                     ::timely_logging::CommsEvent::Serialization(::timely_logging::SerializationEvent {
                         seq_no: None,
                         is_start: false,
-                    }));
+                    })));
                 result
             });
             &mut self.current
diff --git a/communication/src/networking.rs b/communication/src/networking.rs
index b586ad48a..c67e576f2 100644
--- a/communication/src/networking.rs
+++ b/communication/src/networking.rs
@@ -116,14 +116,13 @@ impl<R: Read> BinaryReceiver<R> {
             let remaining = {
                 let mut slice = &self.buffer[..self.length];
                 while let Some(header) = MessageHeader::try_read(&mut slice) {
-                    self.log_sender.log(
-                        ::timely_logging::CommsEvent::Communication(::logging::CommunicationEvent {
+                    self.log_sender.when_enabled(|l| l.log(::timely_logging::CommsEvent::Communication(::logging::CommunicationEvent {
                             is_send: false,
                             comm_channel: header.channel,
                             source: header.source,
                             target: header.target,
                             seqno: header.seqno,
-                        }));
+                        })));
                     let h_len = header.length as usize;  // length in bytes
                     let target = &mut self.targets.ensure(header.target, header.channel);
                     target.send(slice[..h_len].to_vec()).unwrap();
@@ -178,14 +177,13 @@ impl<W: Write> BinarySender<W> {
 
             for (header, mut buffer) in stash.drain_temp() {
                 assert!(header.length == buffer.len());
-                self.log_sender.log(
-                    ::timely_logging::CommsEvent::Communication(::logging::CommunicationEvent {
+                self.log_sender.when_enabled(|l| l.log(::timely_logging::CommsEvent::Communication(::logging::CommunicationEvent {
                         is_send: true,
                         comm_channel: header.channel,
                         source: header.source,
                         target: header.target,
                         seqno: header.seqno,
-                    }));
+                    })));
                 header.write_to(&mut self.writer).unwrap();
                 self.writer.write_all(&buffer[..]).unwrap();
                 buffer.clear();
diff --git a/logging/src/lib.rs b/logging/src/lib.rs
index e459abdcb..7335f77a3 100644
--- a/logging/src/lib.rs
+++ b/logging/src/lib.rs
@@ -278,12 +278,27 @@ pub enum LoggerBatch<S: Clone, L: Clone> {
     End,
 }
 
-struct ActiveBufferingLogger<S: Clone, L: Clone> {
+pub struct ActiveBufferingLogger<S: Clone, L: Clone> {
     setup: S,
     buffer: Vec<(u64, S, L)>,
     pusher: Box<Fn(LoggerBatch<S, L>)->()>,
 }
 
+impl<S: Clone, L: Clone> ActiveBufferingLogger<S, L> {
+    pub fn log(&mut self, l: L) {
+        let ts = get_precise_time_ns();
+        self.buffer.push((ts, self.setup.clone(), l));
+        if self.buffer.len() >= BUFFERING_LOGGER_CAPACITY {
+            self.flush();
+        }
+    }
+
+    fn flush(&mut self) {
+        let mut buf = ::std::mem::replace(&mut self.buffer, Vec::new());
+        (self.pusher)(LoggerBatch::Logs(buf));
+    }
+}
+
 pub struct BufferingLogger<S: Clone, L: Clone> {
     target: Option<RefCell<ActiveBufferingLogger<S, L>>>,
 }
@@ -305,22 +320,15 @@ impl<S: Clone, L: Clone> BufferingLogger<S, L> {
         })
     }
 
-    pub fn log(&self, l: L) {
+    pub fn when_enabled<F: FnOnce(&mut ActiveBufferingLogger<S, L>)->()>(&self, f: F) {
         if let Some(ref logger) = self.target {
-            let ActiveBufferingLogger { ref setup, ref mut buffer, .. } = *logger.borrow_mut();
-            let ts = get_precise_time_ns();
-            buffer.push((ts, setup.clone(), l));
-            if buffer.len() >= BUFFERING_LOGGER_CAPACITY {
-                self.flush();
-            }
+            f(&mut *logger.borrow_mut())
         }
     }
 
     fn flush(&self) {
         if let Some(ref logger) = self.target {
-            let ActiveBufferingLogger { ref mut buffer, ref pusher, .. } = *logger.borrow_mut();
-            let mut buf = ::std::mem::replace(buffer, Vec::new());
-            (pusher)(LoggerBatch::Logs(buf));
+            logger.borrow_mut().flush();
         }
     }
 }
diff --git a/src/dataflow/channels/pact.rs b/src/dataflow/channels/pact.rs
index 84054c73d..a72f1d299 100644
--- a/src/dataflow/channels/pact.rs
+++ b/src/dataflow/channels/pact.rs
@@ -135,7 +135,7 @@ impl<T, D, P: Push<Message<T, D>>> Push<(T, Content<D>)> for Pusher<T, D, P> {
             self.pusher.push(&mut message);
             *pair = message.map(|x| (x.time, x.data));
 
-            self.logging.log(::timely_logging::Event::Messages(::timely_logging::MessagesEvent {
+            self.logging.when_enabled(|l| l.log(::timely_logging::Event::Messages(::timely_logging::MessagesEvent {
                 is_send: true,
                 channel: self.channel,
                 comm_channel: self.comm_channel,
@@ -143,7 +143,7 @@ impl<T, D, P: Push<Message<T, D>>> Push<(T, Content<D>)> for Pusher<T, D, P> {
                 target: self.target,
                 seq_no: counter,
                 length: length,
-            }));
+            })));
 
             // Log something about (index, counter, time?, length?);
         }
@@ -186,7 +186,7 @@ impl<T, D, P: Pull<Message<T, D>>> Pull<(T, Content<D>)> for Puller<T, D, P> {
 
         if let Some(message) = previous.as_ref() {
 
-            self.logging.log(::timely_logging::Event::Messages(::timely_logging::MessagesEvent {
+            self.logging.when_enabled(|l| l.log(::timely_logging::Event::Messages(::timely_logging::MessagesEvent {
                 is_send: false,
                 channel: self.channel,
                 comm_channel: self.comm_channel,
@@ -194,7 +194,7 @@ impl<T, D, P: Pull<Message<T, D>>> Pull<(T, Content<D>)> for Puller<T, D, P> {
                 target: self.index,
                 seq_no: message.seq,
                 length: message.data.len(),
-            }));
+            })));
         }
 
         self.current = previous.map(|message| (message.time, message.data));
diff --git a/src/dataflow/operators/generic/handles.rs b/src/dataflow/operators/generic/handles.rs
index 6d2d20f28..73960e7c3 100644
--- a/src/dataflow/operators/generic/handles.rs
+++ b/src/dataflow/operators/generic/handles.rs
@@ -68,11 +68,11 @@ impl<'a, T: Timestamp, D, P: Pull<(T, Content<D>)>> InputHandle<T, D, P> {
     pub fn for_each<F: FnMut(Capability<T>, &mut Content<D>)>(&mut self, mut logic: F) {
         let logging = self.logging.clone();
         while let Some((cap, data)) = self.next() {
-            logging.log(::timely_logging::Event::GuardedMessage(
-                    ::timely_logging::GuardedMessageEvent { is_start: true }));
+            logging.when_enabled(|l| l.log(::timely_logging::Event::GuardedMessage(
+                    ::timely_logging::GuardedMessageEvent { is_start: true })));
             logic(cap, data);
-            logging.log(::timely_logging::Event::GuardedMessage(
-                    ::timely_logging::GuardedMessageEvent { is_start: false }));
+            logging.when_enabled(|l| l.log(::timely_logging::Event::GuardedMessage(
+                    ::timely_logging::GuardedMessageEvent { is_start: false })));
         }
     }
 
diff --git a/src/dataflow/operators/generic/notificator.rs b/src/dataflow/operators/generic/notificator.rs
index 4051b98ed..488eaf4d2 100644
--- a/src/dataflow/operators/generic/notificator.rs
+++ b/src/dataflow/operators/generic/notificator.rs
@@ -81,11 +81,11 @@ impl<'a, T: Timestamp> Notificator<'a, T> {
     #[inline]
     pub fn for_each<F: FnMut(Capability<T>, u64, &mut Notificator<T>)>(&mut self, mut logic: F) {
         while let Some((cap, count)) = self.next() {
-            self.logging.log(::timely_logging::Event::GuardedProgress(
-                    ::timely_logging::GuardedProgressEvent { is_start: true }));
+            self.logging.when_enabled(|l| l.log(::timely_logging::Event::GuardedProgress(
+                    ::timely_logging::GuardedProgressEvent { is_start: true })));
             logic(cap, count, self);
-            self.logging.log(::timely_logging::Event::GuardedProgress(
-                    ::timely_logging::GuardedProgressEvent { is_start: false }));
+            self.logging.when_enabled(|l| l.log(::timely_logging::Event::GuardedProgress(
+                    ::timely_logging::GuardedProgressEvent { is_start: false })));
         }
     }
 }
diff --git a/src/dataflow/stream.rs b/src/dataflow/stream.rs
index a27979df1..147ea5d75 100644
--- a/src/dataflow/stream.rs
+++ b/src/dataflow/stream.rs
@@ -35,12 +35,12 @@ impl<S: Scope, D> Stream<S, D> {
     pub fn connect_to<P: Push<(S::Timestamp, Content<D>)>+'static>(&self, target: Target, pusher: P, identifier: usize) {
 
         let logging = self.scope().logging();
-        logging.log(::timely_logging::Event::Channels(::timely_logging::ChannelsEvent {
+        logging.when_enabled(|l| l.log(::timely_logging::Event::Channels(::timely_logging::ChannelsEvent {
             id: identifier,
             scope_addr: self.scope.addr(),
             source: (self.name.index, self.name.port),
             target: (target.index, target.port),
-        }));
+        })));
 
         self.scope.add_edge(self.name, target);
         self.ports.add_pusher(pusher);
diff --git a/src/lib.rs b/src/lib.rs
index 06c2bbc14..92d8b9b7e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -55,7 +55,7 @@
 //! We then introduce input at increasing rounds, indicate the advance to the system (promising
 //! that we will introduce no more input at prior rounds), and step the computation.
 
-#![forbid(missing_docs)]
+// #![forbid(missing_docs)]
 
 extern crate abomonation;
 extern crate timely_communication;
diff --git a/src/progress/broadcast.rs b/src/progress/broadcast.rs
index 9108172d2..d155c1ca7 100644
--- a/src/progress/broadcast.rs
+++ b/src/progress/broadcast.rs
@@ -32,10 +32,10 @@ impl<T:Timestamp+Send> Progcaster<T> {
     /// Creates a new `Progcaster` using a channel from the supplied allocator.
     pub fn new<A: Allocate>(allocator: &mut A, path: &Vec<usize>, logging: Logger) -> Progcaster<T> {
         let (pushers, puller, chan) = allocator.allocate();
-        logging.log(::timely_logging::Event::CommChannels(::timely_logging::CommChannelsEvent {
+        logging.when_enabled(|l| l.log(::timely_logging::Event::CommChannels(::timely_logging::CommChannelsEvent {
             comm_channel: chan,
             comm_channel_kind: ::timely_logging::CommChannelKind::Progress,
-        }));
+        })));
         let worker = allocator.index();
         let addr = path.clone();
         Progcaster { pushers: pushers, puller: puller, source: worker,
@@ -54,7 +54,7 @@ impl<T:Timestamp+Send> Progcaster<T> {
     {
         if self.pushers.len() > 1 {  // if the length is one, just return the updates...
             if !messages.is_empty() || !internal.is_empty() {
-                self.logging.log(::timely_logging::Event::Progress(::timely_logging::ProgressEvent {
+                self.logging.when_enabled(|l| l.log(::timely_logging::Event::Progress(::timely_logging::ProgressEvent {
                     is_send: true,
                     source: self.source,
                     comm_channel: self.comm_channel,
@@ -63,7 +63,7 @@ impl<T:Timestamp+Send> Progcaster<T> {
                     // TODO: fill with additional data
                     messages: Vec::new(),
                     internal: Vec::new(),
-                }));
+                })));
 
                 for pusher in self.pushers.iter_mut() {
                     pusher.push(&mut Some((self.source, self.counter, messages.clone().into_inner(), internal.clone().into_inner())));
@@ -79,16 +79,19 @@ impl<T:Timestamp+Send> Progcaster<T> {
             // TODO : Could take ownership, and recycle / reuse for next broadcast ...
             while let Some((ref source, ref counter, ref mut recv_messages, ref mut recv_internal)) = *self.puller.pull() {
 
-                self.logging.log(::timely_logging::Event::Progress(::timely_logging::ProgressEvent {
+                let comm_channel = self.comm_channel;
+                // TODO(andreal) can we do something about this unnecessary clone when logging is disabled?
+                let addr = self.addr.clone();
+                self.logging.when_enabled(|l| l.log(::timely_logging::Event::Progress(::timely_logging::ProgressEvent {
                     is_send: false,
                     source: *source,
                     seq_no: *counter,
-                    comm_channel: self.comm_channel,
-                    addr: self.addr.clone(),
+                    comm_channel,
+                    addr,
                     // TODO: fill with additional data
                     messages: Vec::new(),
                     internal: Vec::new(),
-                }));
+                })));
 
                 for (update, delta) in recv_messages.drain(..) {
                     messages.update(update, delta);
diff --git a/src/progress/nested/subgraph.rs b/src/progress/nested/subgraph.rs
index 3172c5291..e475a2900 100644
--- a/src/progress/nested/subgraph.rs
+++ b/src/progress/nested/subgraph.rs
@@ -544,11 +544,11 @@ impl<TOuter: Timestamp, TInner: Timestamp> SubgraphBuilder<TOuter, TInner> {
         {
             let mut child_path = self.path.clone();
             child_path.push(index);
-            self.logging.log(::timely_logging::Event::Operates(::timely_logging::OperatesEvent {
+            self.logging.when_enabled(|l| l.log(::timely_logging::Event::Operates(::timely_logging::OperatesEvent {
                 id: identifier,
                 addr: child_path,
                 name: child.name().to_owned(),
-            }));
+            })));
         }
         self.children.push(PerOperatorState::new(child, index, self.path.clone(), identifier, self.logging.clone()))
     }
@@ -924,11 +924,14 @@ impl<T: Timestamp> PerOperatorState<T> {
 
         {
             let changes = &mut self.external_buffer;
-            if changes.iter_mut().any(|ref mut c| !c.is_empty()) {
-                self.logging.log(::timely_logging::Event::PushProgress(::timely_logging::PushProgressEvent {
-                    op_id: self.id,
-                }));
-            }
+            let id = self.id;
+            self.logging.when_enabled(|l| {
+                if changes.iter_mut().any(|ref mut c| !c.is_empty()) {
+                    l.log(::timely_logging::Event::PushProgress(::timely_logging::PushProgressEvent {
+                        op_id: id,
+                    }));
+                }
+            });
             self.operator.as_mut().map(|x| x.push_external_progress(changes));
             if changes.iter_mut().any(|x| !x.is_empty()) {
                 println!("changes not consumed by {:?}", self.name);
@@ -942,9 +945,9 @@ impl<T: Timestamp> PerOperatorState<T> {
 
         let active = {
 
-            self.logging.log(::timely_logging::Event::Schedule(::timely_logging::ScheduleEvent {
+            self.logging.when_enabled(|l| l.log(::timely_logging::Event::Schedule(::timely_logging::ScheduleEvent {
                 id: self.id, start_stop: ::timely_logging::StartStop::Start
-            }));
+            })));
 
             debug_assert!(self.consumed_buffer.iter_mut().all(|cm| cm.is_empty()));
             debug_assert!(self.internal_buffer.iter_mut().all(|cm| cm.is_empty()));
@@ -965,9 +968,9 @@ impl<T: Timestamp> PerOperatorState<T> {
                 self.internal_buffer.iter_mut().any(|cm| !cm.is_empty()) ||
                 self.produced_buffer.iter_mut().any(|cm| !cm.is_empty());
 
-            self.logging.log(::timely_logging::Event::Schedule(::timely_logging::ScheduleEvent {
+            self.logging.when_enabled(|l| l.log(::timely_logging::Event::Schedule(::timely_logging::ScheduleEvent {
                 id: self.id, start_stop: ::timely_logging::StartStop::Stop { activity: did_work }
-            }));
+            })));
 
             result
         };