revlog: avoid an expensive string copy This showed up in a statprof profile of "hg svn rebuildmeta", which is read-intensive on the changelog. This two-line patch improved the performance of that command by 10%.

changegroupsubset: avoid setdefault in inner loop

changegroupsubset: drop repeated len() calls

changegroup: reduce progress overhead

changegroupsubset: renest inner loop The mdata list should generally be shorter than changedfiles

revlog: increase readahead size

revset: avoid demandimport bug Apparently the "import x as xy" doesn't manage to update xy in the current scope's dictionary after load, which causes nodemod.nullrev to do a huge amount of demandload magic in the inner loop.

mq: replace hasattr() with util.safehasattr(), update check-code.py

merge with stable

parsers: use base-16 trie for faster node->rev mapping This greatly speeds up node->rev lookups, with results that are often user-perceptible: for instance, "hg --time log" of the node associated with rev 1000 on a linux-2.6 repo improves from 0.3 seconds to 0.03. I have not found any instances of slowdowns. The new perfnodelookup command in contrib/perf.py demonstrates the speedup more dramatically, since it performs no I/O. For a single lookup, the new code is about 40x faster. These changes also prepare the ground for the possibility of further improving the performance of prefix-based node lookups.