Re: [Gnewsense-dev] ccache support patch for the Builder

[Sam Geeraerts]

Dmitry Samoyloff schreef:
> At Tue, 15 Jun 2010 22:00:46 +0200,
> Sam Geeraerts wrote:
> > Dmitry Samoyloff schreef:
> > > Hello,
> > >
> > > As far, as I've rebuilt new Gnash in the Builder several times already, ccache
> > > is certainly of help for me. Attached is a small 2-line patch for the Builder
> > > to support ccache.
> > Intersting idea. I have little experience with ccache. It's only useful 
> > from the second time on a package is compiled, right?
>
> Yes.
>
> > Builder normally 
> > compiles a package only once. I'm curious to know what the ccache 
> > penalty is. If it makes Builder run a lot longer I'd rather not include 
> > it by default.
>
> http://ccache.samba.org/performance.html
>
> Well, at least we could make it an option in config.local, right?

Alright. I'll take a patch where's it's commented in config with an 
explanation that it's useful to uncomment it when testing.

> > I guess ccache only works when the binaries are not removed between 
> > compiles. Builder removes $WORKINGDIR every time before building a 
> > package. Can you explain how ccache can do its thing then?
>
> It stores all info in its own cache (say, ~/.ccache/), thus it is OK to remove
> a build directory. My do-update time for Gnash decreased from half an hour to
> several minutes with ccache.

So it needs a few extra GiB of disk space for all the packages we 
rebuild then. I know some people use(d) Builder on an old spare computer 
that's a bit tight on disk space. But old computers benefit even more 
for ccache, so that's a good trade-off.