store: don't read the whole fncache in memory
In large repositories with lot of files, the fncache grows more than 100 MB and
reading that whole thing into memory slows things down. Let's not read the whole
thing into memory.
This patch changes fncache loading code to read 1 MB at once. Loading 1 MB at
once saves ~1 sec on perffncacheload for our internal repository. I tried
various values such as 0.5 MB, 5 MB, 10 MB but best results were produced using
1 MB as the chunksize.
On a narrow clone with fncache around 40 MB, this patch saves ~0.04 seconds on
average on perffncacheload.
To test the code, I have coded an extension in test-fncache.t which set
chunksize to 1 byte, and the test passes with that.
Differential Revision: https://phab.mercurial-scm.org/D5296
; Script generated by the Inno Setup Script Wizard.
; SEE THE DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!
#ifndef VERSION
#define FileHandle
#define FileLine
#define VERSION = "unknown"
#if FileHandle = FileOpen(SourcePath + "\..\..\..\mercurial\__version__.py")
#expr FileLine = FileRead(FileHandle)
#expr FileLine = FileRead(FileHandle)
#define VERSION = Copy(FileLine, Pos('"', FileLine)+1, Len(FileLine)-Pos('"', FileLine)-1)
#endif
#if FileHandle
#expr FileClose(FileHandle)
#endif
#pragma message "Detected Version: " + VERSION
#endif
#ifndef ARCH
#define ARCH = "x86"
#endif
[Setup]
AppCopyright=Copyright 2005-2019 Matt Mackall and others
AppName=Mercurial
AppVersion={#VERSION}
#if ARCH == "x64"
AppVerName=Mercurial {#VERSION} (64-bit)
OutputBaseFilename=Mercurial-{#VERSION}-x64
ArchitecturesAllowed=x64
ArchitecturesInstallIn64BitMode=x64
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VersionInfoCompany=Matt Mackall and others
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Source: contrib\vim\*.*; DestDir: {app}/Contrib/Vim
Source: contrib\zsh_completion; DestDir: {app}/Contrib
Source: contrib\bash_completion; DestDir: {app}/Contrib
Source: contrib\tcsh_completion; DestDir: {app}/Contrib
Source: contrib\tcsh_completion_build.sh; DestDir: {app}/Contrib
Source: contrib\hgk; DestDir: {app}/Contrib; DestName: hgk.tcl
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Source: dist\hg.exe; DestDir: {app}; AfterInstall: Touch('{app}\hg.exe.local')
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[Tasks]
Name: modifypath; Description: Add the installation path to the search path; Flags: unchecked
[Code]
procedure Touch(fn: String);
begin
SaveStringToFile(ExpandConstant(fn), '', False);
end;
const
ModPathName = 'modifypath';
ModPathType = 'user';
function ModPathDir(): TArrayOfString;
begin
setArrayLength(Result, 1)
Result[0] := ExpandConstant('{app}');
end;
#include "modpath.iss"