MIME-Version: 1.0
From: Thomas Munro <thomas.munro@enterprisedb.com>
Date: Sat, 25 Nov 2017 16:38:38 +1300
Message-ID: 
 <CAEepm=2HZ+LkTSMtihu61wd63vpLwYE-cE41syf=1FHsO6gybg@mail.gmail.com>
Subject: MacPorts xsltproc is very slow?
To: pgsql-docs@postgresql.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Hi,

Does anyone know why I'd see this difference in "make docs" performance?

1.  On macOS using Apple's /usr/bin/xsltproc (--version says libxml
20902, libxslt 10128 and libexslt 817), it builds in a few minutes but
produces warnings like this:

postgres.sgml:408: element biblioentry: validity error : ID ston89b
already defined
postgres.sgml:426: element biblioentry: validity error : ID ston90a
already defined
postgres.sgml:454: element biblioentry: validity error : ID ston90b
already defined

2.  On macOS using MacPorts' /opt/local/bin/xsltproc (--version says
libxml 20907, libxslt 10132 and libexslt 820), the xsltproc step runs
for *half an hour* on my laptop.  I have no idea what it's doing.
With dtruss I see a bunch of madvise(MADV_CAN_REUSE) half of which
fail with EINVAL, and a bunch of
stat64("/opt/local/lib/libxslt-plugins/nwalsh_com_xslt_ext_com_nwalsh_saxon_UnwrapLinks.so\0").
Applying Alexander Law's patch[1] makes most of the latter go away but
doesn't fix the run time problem.

I noticed that the Apple version is using libxslt 1.1.28 (for context,
that's the same as Debian Jessie used; Stretch/Buster/Sid are on
1.1.29 -- I'm guessing many of you are using that?), whereas MacPorts
is shipping libxslt 1.1.32.  I know next to nothing about these tools
but I wonder if something we're doing gets horribly slow in future
libxslt versions that will come down the pipeline on other
distributions.  Or if the MacPorts port is just borked somehow.  For
now I've uninstalled it and am ignoring the warnings from the Apple
version (my other car is a FreeBSD where I can't build the docs at all
since commit d6376245 because it's stuck with DocBooks 1.76.1).  Any
clues would be gratefully received.

[1] https://www.postgresql.org/message-id/bfce8c4e-e200-9617-791a-4e05a054e698%40gmail.com

-- 
Thomas Munro
http://www.enterprisedb.com