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perf: make `hg perfwrite` more flexible...

perf: make `hg perfwrite` more flexible The more flexible command was used recently while finding a solution for a buffering bug (eventually fixed in (the changeset description uses a different benchmark)). In comparison to the previous version, the new version is much more flexible. While using it, the focus was on testing small writes. For this reason, by default it calls ui.write() 100 times with a single byte plus one newline byte, for 100 lines. To get the previous behavior, run `hg perfwrite --nlines=100000 --nitems=1 --item='Testing write performance' --batch-line`.

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Martin von Zweigbergk releasenotes: add a file in which to record release notes...	r42457	== New Features ==

Martin von Zweigbergk debugmergestate: make templated...	r44880
Martin von Zweigbergk copy: add experimental support for marking committed copies...	r44847	== New Experimental Features ==
Martin von Zweigbergk revset: add a revset for parents in merge state...	r44817
Valentin Gatien-Baron relnotes: advertize the possibility to use rust...	r45441	* The core of some hg operations have been (and are being)
		implemented in rust, for speed. `hg status` on a repository with
		300k tracked files goes from 1.8s to 0.6s for instance.
		This has currently been tested only on linux, and does not build on
		windows. See rust/README.rst in the mercurial repository for
		instructions to opt into this.
Valentin Gatien-Baron exchange: turn on option that makes concurrent pushes work better...	r44896
Martin von Zweigbergk releasenotes: add a file in which to record release notes...	r42457	== Backwards Compatibility Changes ==

Manuel Jacob relnotes: note that we now require modern SSL/TLS features in Python	r45423	* Mercurial now requires at least Python 2.7.9 or a Python version that
Manuel Jacob setup: require that Python has TLS 1.1 or TLS 1.2...	r45429	backported modern SSL/TLS features (as defined in PEP 466), and that Python
		was compiled against a OpenSSL version supporting TLS 1.1 or TLS 1.2
		(likely this requires the OpenSSL version to be at least 1.0.1).
Manuel Jacob relnotes: note that we now require modern SSL/TLS features in Python	r45423
Manuel Jacob perf: make `hg perfwrite` more flexible...	r45530	* The `hg perfwrite` command from contrib/perf.py was made more flexible and
		changed its default behavior. To get the previous behavior, run `hg perfwrite
		--nlines=100000 --nitems=1 --item='Testing write performance' --batch-line`.

Martin von Zweigbergk debugmergestate: make templated...	r44880
Martin von Zweigbergk releasenotes: add a file in which to record release notes...	r42457	== Internal API Changes ==

Augie Fackler relnotes: add API change note per request in D8502...	r45380	* logcmdutil.diffordiffstat() now takes contexts instead of nodes.

Augie Fackler mergestate: split out merge state handling code from main merge module...	r45383	* The `mergestate` class along with some related methods and constants have
		moved from `mercurial.merge` to a new `mercurial.mergestate` module.

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