profile: upgrade the "profile" context manager to a full class So far we have been able to use a simple decorator for this. However using the current context manager makes the scope of the profiling in dispatch constrainted and the time frame to decide to enable profiling quite limited (using "maybeprofile") This is the first step toward the ability to enable the profiling from within the profiling scope. eg:: with maybeprofiling(ui) as profiler: ... bar.foo(): ... if options['profile']: profiler.start() ... fooz() ... My target usecase is adding support for "--profile" to alias definitions with effect. These are to be used with "profiling.output=blackbox" to gather data about operation that get slow from time to time (eg: pull being minutes instead of seconds from time to time). Of course, in such case, the scope of the profiling would be smaller since profiler would be started after running extensions 'reposetup' (and other potentially costly logic), but these are not relevant for my target usecase (multiple second commits, multiple tens of seconds pull). Currently adding '--profile' to a command through alias requires to re-spin a Mercurial binary (using "!$HG" in alias), which as a significant performance impact, especially in context where startup performance is being worked on... An alternative approach would be to stop using the context manager in dispatch and move back to a try/finally setup.

     1

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

     2

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

     3

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

     4

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

     5

.TH CHG 1 "March 3, 2013"

     6

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

     7

.\"

     8

.\" Some roff macros, for reference:

     9

.\" .nh        disable hyphenation

    10

.\" .hy        enable hyphenation

    11

.\" .ad l      left justify

    12

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

    13

.\" .nf        disable filling

    14

.\" .fi        enable filling

    15

.\" .br        insert line break

    16

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

    17

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

    18

.SH NAME

    19

chg \- a fast client for Mercurial command server

    20

.SH SYNOPSIS

    21

.B chg

    22

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

    23

.br

    24

.SH DESCRIPTION

    25

The

    26

.B chg

    27

command is the wrapper for

    28

.B hg

    29

command.

    30

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

    31

.SH OPTIONS

    32

This program accepts the same command line syntax as the

    33

.B hg

    34

command. Additionally it accepts the following options.

    35

.TP

    36

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

    37

Terminate the background command servers.

    38

.SH SEE ALSO

    39

.BR hg (1),

    40

.SH AUTHOR

    41

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