[wix-users] Delta created by pyro much larger than actual differences

[Rob Mensching]

Have to ask the Windows Installer team. Delta patching is all implemented at their level.

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-----Original Message-----
From: wix-users [mailto:wix-users-bounces at lists.wixtoolset.org] On Behalf Of Ben Catterall
Sent: Friday, May 20, 2016 12:57 AM
To: wix-users at lists.wixtoolset.org
Subject: [wix-users] Delta created by pyro much larger than actual differences

I've recently added the -delta flag when building patches with pyro which has resulted in smaller patches, but not as small as I was expecting. My script is as follows:

candle patch.wxs
light patch.wixobj
melt ..\old\project.msi -out old.wixpdb -pdb old\project.wixpdb -x old_bin melt ..\new\project.msi -out new.wixpdb -pdb new\project.wixpdb -x new_bin torch -p -xi old.wixpdb new.wixpdb -out diff.wixmst

pyro -delta patch.wixmsp -out patch.msp -t proj1 diff.wixmst

It appears to be one file in particular that's causing problems: The original and new versions of the file are both around the 100MB mark. Using our old bdiff-based patcher generates a diff of 15KB, but pyro -delta uses 18MB!! Examining the file with winmerge confirms that there are not 18MB worth of changes to include.

Is there a way I can improve (reduce) the size of pyro's diff? Is this a bug in WiX?


Ben

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