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0e1f616
(Get the code!)
So Andrew put together lp:~spiv/launchpad/codehosting-cheaper-failures, and I did some tracing, and found one more case where we were creating a deferred that always used the default Failure handling. Putting together those patches, I did a bit more perf testing. The following numbers are running 'initialize' multiple times (deleting the branch inbetween) and picking the best time.
703ms baseline (no modifications)
573ms DeferredBlockin
255ms codehosting-
173ms codehosting-
180ms baseline, hacking Twisted.
To see if this had a real-world effect, I went ahead and did a 'bzr push' of a one-revision branch, in a loop of 20 calls.
1005ms baseline
764ms codehosting-
That includes the ssh handshake overhead, and all the other work that 'push' has to do. (Best case 'initialize' calls during this is 408ms for baseline, 159ms patched)