Re: [PATCH] dist: add dist-zstd option

[Jim Meyering]

On Mon, Nov 11, 2019 at 12:35 PM Giuseppe Scrivano <address@hidden> wrote:
> Hi Jim,
>
> Jim Meyering <address@hidden> writes:
>
> > On Fri, Oct 4, 2019 at 8:03 AM Giuseppe Scrivano <address@hidden> wrote:
> >> add support for using the zstd compression algorithm.
> >
> > Hi Giuseppe,
> > Thank you for that patch.
> > I've adjusted it and propose the attached, which makes these changes:
> > - add tests
> > - that exposed the need for a correction, s/-d/-dc/ in distdir.am
> > - extend documentation
> > - use the 3-byte suffix, .zst, not .zstd
> > - use -19 as the default compression level
> >
> > We must use -19 as the default, not the aggressive --ultra -22 -- the
> > package maintainer can always override with ZSTD_OPT if they know all
> > clients will always have sufficient memory. In the early days, some
> > reported failure to decompress a "xz -9e"-compressed coreutils tarball
> > on tiny-memory routers. Like zstd's --ultra settings, xz's -9 requires
> > more RAM when DEcompressing -- so automake defaults to xz's "-e" (use
> > extra CPU only) and used -e8 for coreutils
> > (https://git.sv.gnu.org/cgit/coreutils.git/commit/?id=v8.15-61-gc1d07237a):
> > i.e., still require 32MiB more RAM, but not the 64MiB that "-9" would
> > require.
> >
> > Cc'd the zstd author, Yann Collet, in case he'd like to add something.
> >
> > Giuseppe, please re-review this diff and its updated commit log.
>
> is there anything more holding the patch?

Sorry about the delay.
On suggestion from Yann, I propose one additional change. Barring
objection, I will push the combined result tomorrow.

automake-zstd-clevel.diff
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