Re: Time to compile

Dear a-a-p,=20

The program does depend on a lot library headers.
of headers. I guess its mostly my fault:=20
If I had written

#include <file.h>=20

instead of=20

#include "file.h" =20

I presume that performance would be much improved.=20
Is there any easy way that I could leave out some directories
in the dependency check?

Derek
>=20
> Fran=E7ois Pinard wrote:
>=20
> > [Bram Moolenaar]
> >=20
> > >Derek Teaney wrote:
> >=20
> > >> I have a list of about 40 files and it takes quite some time (12 s=
)=20
> > >> to decide what to do compile.  Would 400 files then take 2 minutes=
?
> >=20
> > > A-A-P computes a checksum to find out if the file contents has=20
> > > changed.  If your processor is slow this may take a while.  I have=20
> > > worked with Aap and very many files without big delays.  It does=20
> > > depend on the speed of your machine, of course.  Only checking=20
> > > timestamps will be faster, but less accurate.  And after doing "tou=
ch=20
> > > file" a file may seem outdated, causing a lot of work to be done ev=
en=20
> > > when its contents didn't actually change.  That's wasting time then.
> >=20
> > Just an idea.  Could checksums be computed only if timestamps
> > differ (regardless of ordering of timestamps)?  Size might also be=20
> > checked for a bit more safety, when timestamps are identical.  That=20
> > might speed up things for big projects, without adverse effects in=20
> > practice.
>=20
> Timestamps on files often have an accuracy of one second only.  It's
> very well possible today to change a file several times within a second=
,
> e.g. when running a shell script to compile two versions with different
> features.  I don't really want to make Aap less reliable for the sake o=
f
> performance.
>=20
>=20

--=20
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Derek Teaney                   e-mail: Derek.Teaney-nSGZJWG/ZnXz/[email protected]
Dept. of Physics & Astronomy   phone: (631) 632-4528
SUNY at Stony Brook            fax  : (631) 632-9718
Stony Brook, NY 11764-3800         =20
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