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PODelphi: How to organize source code to increase compiler performance?
 

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  1. PODelphi: How to organize source code to increase compiler performance?
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    <p>I'm working on a large delphi 6 project with quite a lot of dependancies. It takes several minutes to compile the whole project. The recompilation after a few changes is sometimes much more longer so that it is quicker to terminate Delphi, erase all dcu files and recompile everything.</p> <p>Does anyone know a way to identify, what makes the compiler slower and slower? Any tips how to organize the code to improve compiler performance?</p> <p>I have already tried following things:</p> <ul> <li>Explicitly include most of the units in the dpr instead of relying on the search path: It didn't improve anything.</li> <li>Use the command line compiler dcc32: it isn't faster.</li> <li>Try to see what the compiler does (using ProcessExplorer from SysInternals): apparently it runs most of the time a function called 'KibitzGetOverloads'. But I can't do anything with this information...</li> </ul> <p><strong>EDIT, Summary of the answers until now:</strong></p> <p>The answer that worked best in my case:</p> <ul> <li>The function "Clean unused units references" from <a href="http://www.cnpack.org/index.php?lang=en" rel="noreferrer">cnpack</a>. It almost automatically cleaned more than 1000 references, making a "cold" compilation about twice faster. ("cold" compilation = erase all dcu files before compiling). <em>It gets the reference list from the compiler. So if you have some {$IFDEF } check that all your configurations still compile.</em></li> </ul> <p>The next thing I would like to try:</p> <ul> <li>Refactoring the unit references manually (eventually using an abstract class) but it is much more work, since I first need to identify where the problems are. Some tools that might help: <ul> <li><a href="http://www.gexperts.org/" rel="noreferrer">GExperts</a> adds a project dependencies browser to the delphi IDE (but unfortunately it can not show the size of each branch)</li> <li><a href="http://cc.embarcadero.com/Item/19441" rel="noreferrer">Delphi Unit Dependency Viewer V1.0</a> do about the same thing but without Delphi. It can calculate some simple statistics (Which units is the most referenced, ...)</li> <li><a href="http://www.peganza.com/products.htm" rel="noreferrer">Icarus</a> which is referenced on <a href="http://blog.fredrikhaglund.se/blog/2006/07/03/optimized-pascal-compilation-time/" rel="noreferrer">a link</a> in one of the answer.</li> </ul></li> </ul> <p>Things that didn't change anything in my case:</p> <ul> <li>Putting every files from my program and all components in one folder without subfolders.</li> <li>Defragmenting the disk (I tried with a ramdisk)</li> <li>Using a ramdisk for the code source and output folders.</li> <li>Turning off the live scanning antivirus</li> <li>Listing all the units in the dpr file instead of relying on the search path.</li> <li>Using the command line compiler dcc32 or ecc32.</li> </ul> <p>Things that didn't apply to my case:</p> <ul> <li>Avoiding having dependencies on network shares.</li> <li>Using <a href="http://andy.jgknet.de/blog/?page%5Fid=8" rel="noreferrer">DelphiSpeedUp</a>, because I already had it.</li> <li>Using a single folder for all dcu (I always do it)</li> </ul> <p>Things that I didn't try:</p> <ul> <li>Upgrading to another Delphi version.</li> <li>Using dcc32speed.exe</li> <li>Using a solid-state drive (I didn't tried it, but I tried with a ramdisk where I put all the source code. But maybe I should have installed delphi on the ramdisk too)</li> </ul>
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    1. COAbout your $IFDEF problem, you should enclose the used units themselve with the proper $IFDEF's to alleviate the problem of CnPack removing them as not being used.
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    2. CO@Lieven: Good Idea to enclose the whole unit whith the proper $IFDEf. But it isn't always possible: if the unit is part of a library that you don't want to change, you are bound to put the $IFDEF in the "Uses".
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