这个问题是之前问题的副产品： 自动创建标签列表以供数据工具使用 和 使用文本中的引用自动从数据工具创建表格。
这是使用 datatool 制作的 LaTeX 文件。有两个略有不同的版本：我将它们称为版本 1 和版本 2。版本 1 由 egreg 制作，版本 2 由 DavidCarlisle 制作。
由于我完全不明白的原因，版本 2 的编译速度比版本 1 慢得多。版本 1 始终需要大约 10 秒。版本 2 有所不同，但至少需要两倍的时间，超过 20 秒。从表面上看，这两个版本非常相似。
不同的版本对应以下文件中的两个块，每个块以\makeatletter和开头makeatother。
测试时，请记住在切换版本时删除 aux 文件。
是什么原因造成了编译速度的显著差异？
#########################################################################
\documentclass{letter}
\usepackage[verbose]{datatool}
\usepackage{datagidx}
\usepackage{longtable}
\usepackage{lipsum}
\usepackage{array}
\usepackage{etoolbox}
\usepackage{url}
\setlength{\oddsidemargin}{-0.10in}
\setlength{\evensidemargin}{-0.10in}
\setlength{\topmargin}{-0.3in}
\setlength{\headsep}{0.2in}
\textheight=8.8in
\textwidth=6.7in
\newcounter{tabenum}\setcounter{tabenum}{0}
\newcommand{\colhead}[1]{\multicolumn{1}{>{\bfseries}l}{#1}}
\newcommand{\nextnuml}[1]{\refstepcounter{tabenum}\thetabenum.\label{#1}}
% VERSION 1
\makeatletter
\let\oldref\ref
\def\ref#1{%
\immediate\write\@auxout{%
\string\gappto\string\ReferencedIDs{#1,}%
}%
\oldref{#1}%
}
\def\ReferencedIDs{}
\makeatother
% VERSION 2
% \makeatletter
% \AtBeginDocument{\providecommand\ReferencedIDs{}}
% \AtEndDocument{\immediate\write\@auxout{\gdef\string\ReferencedIDs{\ReferencedIDs}}}
% \let\oldref\ref
% \def\ref#1{%
% \g@addto@macro\ReferencedIDs{,#1}%
% \oldref{#1}%
% }
% \makeatother
\usepackage{fouriernc}
\address{Some Address\\ Some Place\\Email: [email protected]}
\signature{(Somebody)}
\newcommand*{\checkmissing}[1]{\DTLifnull{#1}{}{#1}}
\newcommand{\PrintDocTableParekh}[3][]{%
% #1 = list of rowIDs
% #2 = database to search
% #3 =caption
\begin{longtable}{r l p{1.5in} c c p{2.5in}}
\caption{#3}\\
& \colhead{Date} & \colhead{Filename} & \colhead{From} & \colhead{To} & \colhead{Subject}\\\hline\endhead
\DTLforeach
[\ifblank{#1}{\boolean{true}}{\DTLisSubString{#1}{\RowID}}]
% [%
% \(%
% \equal{#1}{}\AND\DTLisSubString{\ReferencedIDs}{\RowID}%
% \)%
% \OR\(
% \DTLisSubString{#1}{\RowID}\AND\DTLisSubString{\ReferencedIDs}{\RowID}%
% \)%
% ]
{#2}{%
\RowID=RowID,%
\Date=Date,%
\Filename=Filename,%
\From=From,%
\To=To,%
\Subject=Subject%
}{%
\nextnuml{\RowID} & \Date & {\bfseries\expandafter\url\expandafter{\Filename} } & \checkmissing{\From} & \checkmissing{\To} & \Subject \\
}%
\end{longtable}
}%
\makeatletter
\newcommand{\AddToTable}[2]{%
\DTLforeach*{#2}{\newDBRowID=RowID,\newDBDate=Date,\newDBFilename=Filename,\newDBFrom=From,\newDBTo=To,\newDBSubject=Subject}{
\DTLnewrow{#1}
{\let\DTLnewdbentry\relax % Avoid expansion of \DTLnewdbentry when using \protected@xdef below
\protected@xdef\insertnewdbentry{%
\DTLnewdbentry{#1}{RowID}{\newDBRowID}%
\DTLnewdbentry{#1}{Date}{\newDBDate}%
\DTLnewdbentry{#1}{Filename}{\newDBFilename}%
\DTLnewdbentry{#1}{From}{\newDBFrom}%
\DTLnewdbentry{#1}{To}{\newDBTo}%
\DTLnewdbentry{#1}{Subject}{\newDBSubject}%
}}\insertnewdbentry
}}
\makeatother
\begin{filecontents*}{newa.csv}
smyt.bs.ie,Mar 2004-2013 (incl.),something.txt,,,,subject
ct.bs.ie,Mar 2004-2013 (incl.),something.txt,,,,subject
cf.bs.ie,Mar 2004-2013 (incl.),something.txt,,,,subject
ismail.bs.ie,Mar 2004-2013 (incl.),something.txt,,,,subject
mh.bs.ie,Mar 2004-2013 (incl.),something.txt,,,,subject
smyt.it,2007-2013,something.txt,,,,subject
ismail.it,2008-2013,something.txt,,,,subject
familytree,26 Feb 2014,something.txt,,,,subject
trusts,26 Feb 2014,something.txt,,,,subject
1952.02.19,19 Feb 1952,something.txt,,,,subject
1994.03.26,26 Mar 1994,something.txt,,,,subject
1998.09.14,14 Sep 1998,something.txt,FROM,TO,,subject
1998.09.16,16 Sep 1998,something.txt,FROM,TO,,subject
2001.05.23,23 May 2001,something.txt,FROM,TO,,subject
2007.06.10,10 Jun 2007,something.txt,FROM,TO,,subject
2010.11.04,04 Nov 2010,something.txt,,,,subject
2011.05.09,09 May 2011,something.txt,FROM,TO,Y,subject
2011.09.09.slm,09 Sep 2011,something.txt,FROM,TO,Y,subject
2011.09.26.fm,26 Sep 2011,something.txt,FROM,TO,Y,subject
2011.09.26.slm,26 Sep 2011,something.txt,FROM,TO,Y,subject
2011.09.26.zhm,26 Sep 2011,something.txt,FROM,TO,,subject
2011.11.21.slm,21 Nov 2011,something.txt,FROM,TO,Y,subject
2011.11.21.fm,21 Nov 2011,something.txt,FROM,TO,Y,subject
2011.11.22,22 Nov 2011,something.txt,FROM,TO,Y,subject
2011.11.23,23 Nov 2011,something.txt,FROM,TO,Y,subject
2012.01.25,25 Jan 2012 (?),something.txt,FROM,TO,,subject
2012.12.07,07 Dec 2012,something.txt,FROM,TO,,subject
2013.01.14,14 Jan 2013,something.txt,FROM,TO,,subject
2013.08.29,29 Aug 2013,something.txt,FROM,TO,Y,subject
2013.09.09.fm,09 Sep 2013,something.txt,FROM,TO,Y,subject
2013.09.09.rm,09 Sep 2013,something.txt,FROM,TO,Y,subject
2013.09.10.slm,10 Sep 2013,something.txt,FROM,TO,Y,subject
2013.09.10.fm,10 Sep 2013,something.txt,FROM,TO,Y,subject
2013.09.10.slm2,10 Sep 2013,something.txt,FROM,TO,,subject
2013.09.11.slm1,11 Sep 2013,something.txt,FROM,TO,Y,subject
2013.09.11.fm,11 Sep 2013,something.txt,FROM,TO,Y,subject
2013.09.11.slm2,11 Sep 2013,something.txt,FROM,TO,Y,subject
2013.09.16,16 Sep 2013,something.txt,FROM,TO,,subject
2013.09.17,17 Sep 2013,something.txt,FROM,TO,,subject
2013.09.23,23 Sep 2013,something.txt,FROM,TO,,subject
2013.10.05.powai,05 Oct 2013,something.txt,,,,subject
2013.10.05.kanjur,05 Oct 2013,something.txt,,,,subject
2013.10.06,06 Oct 2013,something.txt,FROM,TO,,subject
2013.10.14.kma,14 Oct 2013,something.txt,FROM,TO,,subject
2013.10.14.ks,14 Oct 2013,something.txt,FROM,TO,,subject
2013.10.16,16 Oct 2013,something.txt,FROM,TO,,subject
2013.10.17,17 Oct 2013,something.txt,FROM,TO,,subject
2013.10.18,18 Oct 2013,something.txt,FROM,TO,,subject
2013.10.22,22 Oct 2013,something.txt,FROM,TO,,subject
2013.10.23,23 Oct 2013,something.txt,FROM,TO,,subject
2013.10.24,24 Oct 2013,something.txt,FROM,TO,,subject
2013.10.25.zhm,25 Oct 2013,something.txt,FROM,TO,,subject
2013.10.25.fm1,25 Oct 2013,something.txt,FROM,TO,Y,subject
2013.10.25.rm1,25 Oct 2013,something.txt,FROM,TO,Y,subject
2013.10.25.fm2,25 Oct 2013,something.txt,FROM,TO,Y,subject
2013.10.25.rm2,25 Oct 2013,something.txt,FROM,TO,Y,subject
2013.10.28,28 Oct 2013,something.txt,FROM,TO,,subject
2013.10.28.zhm,28 Oct 2013,something.txt,,,,subject
2013.10.30,30 Oct 2013,something.txt,FROM,TO,,subject
2013.11.11,11 Nov 2013,something.txt,FROM,TO,,subject
2013.11.12,12 Nov 2013,something.txt,FROM,TO,,subject
2013.11.13,13 Nov 2013,something.txt,FROM,TO,,subject
2013.11.25,25 Nov 2013,something.txt,FROM,TO,,subject
2013.12.05.ta,05 Dec 2013,something.txt,FROM,TO,,subject
2013.12.05.slm,05 Dec 2013,something.txt,FROM,TO,,subject
2014.01.15,15 Jan 2014,something.txt,FROM,TO,,subject
2014.02.24,24 Feb 2014,something.txt,FROM,TO,,subject
2014.02.26,26 Feb 2014,something.txt,,,,subject
2014.04.02,02 Apr 2014,something.txt,FROM,TO,,subject
2014.04.10,10 Apr 2014,something.txt,FROM,TO,,subject
2014.04.15,15 Apr 2014,something.txt,FROM,TO,,subject
2014.07.18.tm,18 Jul 2014,something.txt,FROM,TO,,subject
2014.07.18.ta,18 Jul 2014,something.txt,FROM,TO,,subject
2014.07.24,24 Jul 2014,something.txt,FROM,TO,,subject
2014.09.05.tm,05 Sep 2014,something.txt,FROM,TO,,subject
2014.09.05.ta,05 Sep 2014,something.txt,FROM,TO,,subject
2014.09.05.slm,05 Sep 2014,something.txt,FROM,TO,,subject
2014.10.17,17 Oct 2014,something.txt,FROM,TO,,subject
2014.11.12.tm,12 Nov 2014,something.txt,FROM,TO,,subject
2014.11.14,14 Nov 2014,something.txt,FROM,TO,,subject
2014.11.17,17 Nov 2014,something.txt,FROM,TO,,subject
2015.01.06,06 Jan 2015,something.txt,FROM,TO,,subject
\end{filecontents*}
\begin{document}
\def\today{9th January, 2014}
\begin{letter}{
Someone\\
Somewhere\\
Subject: Some stuff
}
\opening{Dear Someone}
\lipsum[1]. Here is a ref - [\ref{2014.11.14}].
\lipsum[2]. Here is a ref - [\ref{2014.11.14}].
\lipsum[3] Here is a ref - [\ref{2014.11.17}].
\lipsum[4]
\lipsum[5] Here is a ref - [\ref{2014.11.14}].
\lipsum[6] Here is a ref - [\ref{2014.07.18.tm}].
\lipsum[7]
\lipsum[8] Here is a ref - [\ref{2014.11.12.tm}].
\lipsum[9]. See references
~[\ref{2013.10.05.kanjur}], [\ref{2013.10.05.powai}].
[\ref{2013.10.06}], [\ref{2013.10.28.zhm}],
[\ref{2013.10.17}], [\ref{2013.10.22}],
\lipsum[10]. See references
[\ref{2013.10.14.ks}], [\ref{2013.10.06}]
[\ref{2013.10.17}], [\ref{2013.10.22}], [\ref{2013.10.24}],
\lipsum[10]. See references
[\ref{2013.10.28}], [\ref{2013.10.30}]
\lipsum[10]. See references [\ref{2013.11.11}]
\lipsum[11]. See references [\ref{2014.09.05.tm}]
\lipsum[12]. See references
[\ref{2014.07.18.tm}] [\ref{2014.11.12.tm}]
\lipsum[13]. See references
[\ref{2014.11.17}], [\ref{2015.01.06}], [\ref{2015.01.06}]
\closing{Yours Sincerely,}
\DTLloaddb[noheader,keys={RowID,Date,Filename,From,To,Email,Subject}]{newaDB}{newa.csv}
\PrintDocTableParekh[\ReferencedIDs]{newaDB}{Documents}\renewcommand\ReferencedIDs{}
\end{letter}
\end{document}
答案1
您需要清除列表，但它位于组内，因此letter请替换
\renewcommand\ReferencedIDs{}
经过
\gdef\ReferencedIDs{}
那么时间就是一样的