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DJGPP and OpenWatcom (Announce)

posted by Rugxulo Homepage, Usono, 04.03.2008, 15:06

> > I don't know what's this but I can confirm that ~1% win32 files I had
> > compressed by UPX then didn't work.
>
> Windows (some versions only?) loads those parts of the binary only which
> are "used". OTOH an exe-packer will have to read large parts (or all) of
> the binary first to unpack it. So both the time to start the binary and
> the "working set" most likely are worse with a packed binary.
It's mentioned in the docs. In other words, don't compress something you use a bunch of instances of at the same time (make, bash, your favorite text editor perhaps?). It wastes memory in that case. Otherwise, it shouldn't be an issue.

If the compressed item doesn't work any more, it's either using some "dirty hacks" or a genuine bug in UPX (i.e. report it on SourceForge). Always keep a backup of system files if you want to compress 'em.

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