Gregory Szorc <gregory.szorc@gmail.com> [Thu, 19 Jul 2018 11:10:48 -0700] rev 38741
configitems: restore alias for format.aggressivemergedeltas
913ca175c4ae broke BC by dropping support for reading
format.aggressivemergedeltas. Let's restore it.
Differential Revision: https://phab.mercurial-scm.org/D3966
Yuya Nishihara <yuya@tcha.org> [Thu, 19 Jul 2018 21:36:24 +0900] rev 38740
worker: call selector.close() to release polling resources
Augie Fackler <augie@google.com> [Thu, 19 Jul 2018 13:55:54 -0400] rev 38739
release: merge default into stable for 4.7 release freeze
Sushil khanchi <sushilkhanchi97@gmail.com> [Thu, 19 Jul 2018 22:30:37 +0530] rev 38738
histedit: drop --no-backup option
Dropping this option because now we have a better option
than passing --no-backup flag every time, now user can
set a config in hgrc:
[ui]
history-editing-backup = False
This config aims to operate on every history editing command and
it is still work in progress. As yuya suggessted it probably to
late to add full support this config, so making this as
an experimental config.
Differential Revision: https://phab.mercurial-scm.org/D3965
Boris Feld <boris.feld@octobus.net> [Thu, 19 Jul 2018 10:35:29 +0200] rev 38737
aggressivemergedelta: document rename and move to `revlog` section
The config does not follow our naming guideline and "Aggressive" is probably a
word to keep away from users.
The option does not truly fit in the `format` section. It can be turned on and
off for existing repository without much consequence regarding compatibility.
A new `revlog` option is created to control behavior related to revlog writing
and reading. We can see multiple other config options that could be migrated
there.
* format.maxchainlen
* experimental.mmapindexthreshold
* experimental.sparse-read.density-threshold (in an updated form)
* experimental.sparse-read.min-gap-size (in an updated form)
In addition, we can foresee at least a couple of sparse-revlog related option
coming too (to reduce delta chain length and increase snapshot reuse)
These two extra options might fit there too. Unless we want to create a
section dedicated to caches and performance.
* format.chunkcachesize
* format.manifestcachesize
For now, we only migrate `optimize-delta-parent-choice` since it is getting
out of experimental. It is too close to the release to move the other one. In
addition, we still lack proper the prioritization of alias that would help
renaming them without bad consequence for users.
(Not fully happy about the `revlog` name but could not find better).
Boris Feld <boris.feld@octobus.net> [Thu, 19 Jul 2018 10:06:58 +0200] rev 38736
aggressivemergedeltas: rename variable internally
The "aggressivemergedeltas" name is not great. First, it is quite long,
second, we would rather have less "Aggressive" names within the project. We
are about to rename the config option, so it seems the appropriate time to
rename the internal variable.
Boris Feld <boris.feld@octobus.net> [Thu, 19 Jul 2018 09:57:42 +0200] rev 38735
config: document the purpose of the `format` config section
The config section now have a top level documentation to clarify its intend and
usage. In particular, user are now explain when the option are taken in account
and how to convert repository.
There are an handful of experimental options in this section that does not match
its definition. They should be relocated to other section before getting out of
experimental. (see next changeset for one example).
Rodrigo Damazio <rdamazio@google.com> [Wed, 18 Jul 2018 18:36:39 -0700] rev 38734
macosx: fixing macOS version generation after
db9d1dd01bf0
With the Python3 change, the string is now something like
version = b'4.6.2+848-
88be288e8ac1'
where it was previously just:
version = '4.6.2+848-
88be288e8ac1'
Differential Revision: https://phab.mercurial-scm.org/D3964
Sushil khanchi <sushilkhanchi97@gmail.com> [Tue, 10 Jul 2018 17:01:06 +0530] rev 38733
histedit: add history-editing-backup config option
Instead of passing --no-backup option every time you don't
want to store backup, now you can set config option:
[ui]
history-editing-backup = False
This option aims to operate on every history editing command.
Differential Revision: https://phab.mercurial-scm.org/D3901
Gregory Szorc <gregory.szorc@gmail.com> [Wed, 18 Jul 2018 09:49:34 -0700] rev 38732
merge: mark file gets as not thread safe (
issue5933)
In default installs, this has the effect of disabling the thread-based
worker on Windows when manifesting files in the working directory. My
measurements have shown that with revlog-based repositories, Mercurial
spends a lot of CPU time in revlog code resolving file data. This ends
up incurring a lot of context switching across threads and slows down
`hg update` operations when going from an empty working directory to
the tip of the repo.
On mozilla-unified (246,351 files) on an i7-6700K (4+4 CPUs):
before: 487s wall
after: 360s wall (equivalent to worker.enabled=false)
cpus=2: 379s wall
Even with only 2 threads, the thread pool is still slower.
The introduction of the thread-based worker (
02b36e860e0b) states that
it resulted in a "~50%" speedup for `hg sparse --enable-profile` and
`hg sparse --disable-profile`. This disagrees with my measurement
above. I theorize a few reasons for this:
1) Removal of files from the working directory is I/O - not CPU - bound
and should benefit from a thread pool (unless I/O is insanely fast
and the GIL release is near instantaneous). So tests like `hg sparse
--enable-profile` may exercise deletion throughput and aren't good
benchmarks for worker tasks that are CPU heavy.
2) The patch was authored by someone at Facebook. The results were
likely measured against a repository using remotefilelog. And I
believe that revision retrieval during working directory updates with
remotefilelog will often use a remote store, thus being I/O and not
CPU bound. This probably resulted in an overstated performance gain.
Since there appears to be a need to enable the thread-based worker with
some stores, I've made the flagging of file gets as thread safe
configurable. I've made it experimental because I don't want to formalize
a boolean flag for this option and because this attribute is best
captured against the store implementation. But we don't have a proper
store API for this yet. I'd rather cross this bridge later.
It is possible there are revlog-based repositories that do benefit from
a thread-based worker. I didn't do very comprehensive testing. If there
are, we may want to devise a more proper algorithm for whether to use
the thread-based worker, including possibly config options to limit the
number of threads to use. But until I see evidence that justifies
complexity, simplicity wins.
Differential Revision: https://phab.mercurial-scm.org/D3963