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setup: build extensions in parallel by default...

setup: build extensions in parallel by default The build_ext distutils command in Python 3.5+ has a "parallel" option that controls whether to build extensions in parallel. It is disabled by default (None) and can be set to an integer value for number of cores or True to indicate use all available CPU cores. This commit changes our build_ext command override to set "parallel" to True unless a value has been provided by the caller. On my machine, this makes `python setup.py build_ext` 1-4s faster. It is worth noting that at this time, each individual source file constituting the extension is still built serially. For Mercurial, this means that we can't build faster than the slowest-to-build extension, which is the zstd extension by a long shot. This means that setup.py is still not very efficient at utilizing multiple cores. But we're better than before. Differential Revision: https://phab.mercurial-scm.org/D6923 # no-check-commit because of foo_bar naming

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        Yuya Nishihara
    
chg: import frontend sources...

              r28060
            
      .\"                                      Hey, EMACS: -*- nroff -*-

      .\" First parameter, NAME, should be all caps

      .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection

      .\" other parameters are allowed: see man(7), man(1)

      .TH CHG 1 "March 3, 2013"

      .\" Please adjust this date whenever revising the manpage.

      .\"

      .\" Some roff macros, for reference:

      .\" .nh        disable hyphenation

      .\" .hy        enable hyphenation

      .\" .ad l      left justify

      .\" .ad b      justify to both left and right margins

      .\" .nf        disable filling

      .\" .fi        enable filling

      .\" .br        insert line break

      .\" .sp <n>    insert n+1 empty lines

      .\" for manpage-specific macros, see man(7)

      .SH NAME

      chg \- a fast client for Mercurial command server

      .SH SYNOPSIS

      .B chg

      .IR command " [" options "] [" arguments "]..."

      .br

      .SH DESCRIPTION

      The

      .B chg

      command is the wrapper for

      .B hg

      command.

      It uses the Mercurial command server to reduce start-up overhead.

      .SH OPTIONS

      This program accepts the same command line syntax as the

      .B hg

      command. Additionally it accepts the following options.

      .TP

      .B \-\-kill\-chg\-daemon

      Terminate the background command servers.

      .SH SEE ALSO

      .BR hg (1),

      .SH AUTHOR

      Written by Yuya Nishihara <yuya@tcha.org>.

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Yuya Nishihara chg: import frontend sources...	r28060	.\" Hey, EMACS: -- nroff --
		.\" First parameter, NAME, should be all caps
		.\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
		.\" other parameters are allowed: see man(7), man(1)
		.TH CHG 1 "March 3, 2013"
		.\" Please adjust this date whenever revising the manpage.
		.\"
		.\" Some roff macros, for reference:
		.\" .nh disable hyphenation
		.\" .hy enable hyphenation
		.\" .ad l left justify
		.\" .ad b justify to both left and right margins
		.\" .nf disable filling
		.\" .fi enable filling
		.\" .br insert line break
		.\" .sp <n> insert n+1 empty lines
		.\" for manpage-specific macros, see man(7)
		.SH NAME
		chg \- a fast client for Mercurial command server
		.SH SYNOPSIS
		.B chg
		.IR command " [" options "] [" arguments "]..."
		.br
		.SH DESCRIPTION
		The
		.B chg
		command is the wrapper for
		.B hg
		command.
		It uses the Mercurial command server to reduce start-up overhead.
		.SH OPTIONS
		This program accepts the same command line syntax as the
		.B hg
		command. Additionally it accepts the following options.
		.TP
		.B \-\-kill\-chg\-daemon
		Terminate the background command servers.
		.SH SEE ALSO
		.BR hg (1),
		.SH AUTHOR
		Written by Yuya Nishihara <yuya@tcha.org>.