File size and smartlinking/de

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Einleitung

In Free Pascal entfernt die Compilereinstellung "Smart-Linkbar" bzw. "-CX" aus der ausführbaren Datei den nicht verwendeten Code und die nicht verwendeten Variablen.

Case study 1 in Windows

This study was conducted on the 8th of February 2006 because a Lazarus fully compiled with Smartlinking was Released (version 0.9.12). It intends to establish the relationship between the varying results below with different Lazarus and Free Pascal versions as well as with Smartlinking and without.

The Variables being studied are:

• Executable Größe nach strip
• Executable Größe nach strip und UPX
• Linking Zeit

Compile time isn´t considered here because it´s too similar on all configurations and much less significant than the link time.

Executable size without strip isn´t included. Notice that strip was used always from command line with the command:

strip --strip-all magnifier.exe

The program being compiled is the Virtual Magnifying Glass. The source and binaries for this program are freely available for download on: http://magnifier.sourceforge.net

About the linking time please note that the utilized computer is 3.2GHz Pentium 4 with Intel motherboard and dual core processor and 512MB of RAM.

Ergebnisse

The utilized OS is Windows XP and the 0.9.13 versions are from the same date when 0.9.12 was release. The comparison took place using the following software configurations:

• Lazarus 0.9.12 available here. Free Pascal 2.0.2 that comes with the installer. LCL and RTL are smartlinked. Refered from now on as simply 0.9.12.

• Lazarus 0.9.13 downloaded from Subversion from the same date. Free Pascal 2.0.2 installed separately. The LCL is not smartlinked. Refered from now on as simply 0.9.13 + 2.0.2.

• Lazarus 0.9.13 snapshot. Free Pascal 2.1 that comes with the installer. The LCL is not smartlinked. Refered from now on as simply 0.9.13 + 2.1.

• Lazarus 0.9.13 snapshot. Free Pascal 2.1 that comes with the installer. The LCL is smartlinked. Refered from now on as simply 0.9.13 + 2.1 + SL.

	0.9.12	0.9.13 + 2.0.2	0.9.13 + 2.1 + SL	0.9.13 + 2.1
File Size after strip (in bytes)	1108480	1587712	1425408	1649152
File Size after UPX (in bytes)	318976	438272	388608	454144
Linking time	15 seconds	5 seconds	45 seconds	10 seconds

Fazit

The 0.9.13 snapshot from the 8th of February 2006 features a unstable compiler from the 2.1 branch, which can cause the bigger executables and slower linking time as compared to the other versions.

The 0.9.12 version has the best file size of all, both with UPX and without, showing that Smartlinking really can diminish the file size in Windows. This, however, does not come without a cost, and the cost is linking time, which is about 3 times higher then without smartlinking.

The 0.9.12 version already comes fully configured for Smartlinking on Windows and no extra configuration is needed. This was not the case on previous releases.

Siehe auch

• Guide for anyone inexperienced in getting FPC and Lazarus to work properly.