Eric Blake wrote: > On 03/02/2012 10:24 AM, Jim Meyering wrote: >> Bob Friesenhahn wrote: >> >>> On Fri, 2 Mar 2012, Bob Friesenhahn wrote: >>>> >>>> I tried to test how much peak memory 'xz' uses to decompress the >>>> autoconf tarball but was (apparently) defeated by the strange way >>>> that 'xz' is linked. I will try again with a different tool this >>>> weekend. >>> >>> Ok, I have now measured how much memory the 'xz' I have here requires >>> under Linux to decompress the autoconf beta tarball. It requires >>> 67,184,168 bytes of heap memory. This seems to match the xz >>> documentation for the -9 compression level. >> >> The autoconf tarball is not large enough to warrant using xz's -9 option. >> A simple xz -e (i.e., use the default of -6) should be fine. > > What's the magic to add to cfg.mk to get that change in default? I just > used gnulib's maint.mk 'make beta' to make the 2.68b tarball, so if the > defaults are wrong in maint.mk, maybe we should be fixing things > upstream from autoconf. It depends on the size of your tarball. Since autoconf's is smaller than 8MiB, the default of -6 is perfect and there is no benefit even from using -7. Here's the gnulib patch that I'll soon push: >From c60ba70014f8948154e1157fb2b5d4af88e5ebbc Mon Sep 17 00:00:00 2001 From: Jim Meyering <meyering@xxxxxxxxxx> Date: Fri, 2 Mar 2012 18:35:12 +0100 Subject: [PATCH] maint: don't specify XZ_OPT=-9ev in dist-related rule Using xz's -9 option is warranted only if you have a very large tarball (see xz's documentation for the sizes vs. presets), and requires 64MiB of memory at decompression time. * top/maint.mk (alpha beta stable): Don't specify XZ_OPT=-9ev. Automake's default of just "-e" is fine. Override on a per-package basis by setting XZ_OPT e.g., in cfg.mk. --- ChangeLog | 10 ++++++++++ top/maint.mk | 2 +- 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/ChangeLog b/ChangeLog index c3490a0..ab73cce 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,13 @@ +2012-03-02 Jim Meyering <meyering@xxxxxxxxxx> + + maint: don't specify XZ_OPT=-9ev in dist-related rule + Using xz's -9 option is warranted only if you have a very large + tarball (see xz's documentation for the sizes vs. presets), and + requires 64MiB of memory at decompression time. + * top/maint.mk (alpha beta stable): Don't specify XZ_OPT=-9ev. + Automake's default of just "-e" is fine. Override on a + per-package basis by setting XZ_OPT e.g., in cfg.mk. + 2012-03-01 Eric Blake <eblake@xxxxxxxxxx> maint.mk: allow announcement for non-gnulib project diff --git a/top/maint.mk b/top/maint.mk index 4cbd5f4..a97e0bd 100644 --- a/top/maint.mk +++ b/top/maint.mk @@ -1332,7 +1332,7 @@ alpha beta stable: $(local-check) writable-files $(submodule-checks) $(MAKE) vc-diff-check $(MAKE) news-check $(MAKE) distcheck - $(MAKE) dist XZ_OPT=-9ev + $(MAKE) dist $(MAKE) $(release-prep-hook) RELEASE_TYPE=$@ $(MAKE) -s emit_upload_commands RELEASE_TYPE=$@ -- 1.7.9.2.324.g1221 _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx https://lists.gnu.org/mailman/listinfo/autoconf
