On Sat, 24 Sep 2011 15:45:52 +0000, lilyp...@googlecode.com wrote:
Comment #1 on issue 1926 by tdaniels...@googlemail.com: 2.15.12
processing speed problems
http://code.google.com/p/lilypond/issues/detail?id=1926
Mike said:
Here, on current master from my VirtualBox, paper-twosided.ly takes
8ish seconds with current master and 7ish seconds rewound to
079a12b77ac95640595a6433761e7b46d5552af9 (the commit before the flag
grobs).
paper-twosided.ly seems like the best test to tackle at first, as
there
are no flags & no beams, so the only thing from the stem/beam/flag
work
that could be slowing it down is the stem pure-height and/or height
function (and their consorts of helper functions). However, as I
can't
reproduce the large difference in compile times, it is difficult for
me
to start separating signal from noise in terms of what is actually
taking
longer.
I tried paper-twosided.ly using the 2.15.11 and 2.15.8 binaries for
Windows
and found no significant differences in the compile times, c. 25s
each. But
2.15.12 took around 60s, so I can confirm the slowdown in the GUB
binaries.
Mike: try checking the commit corresponding to 2.15.12:
63cfd5548c42a98c7dae43f1f92e67772969e53c
Just tried it - the compile time was 4s. Way strange...
Maybe the slowdown is not apparent in current master.
I just read over the code in stem.cc for beamless stems and I don't
see
anything that could result in functions being over-called. There
are a
few extra lookups in separate functions (for example, the beam
object is
looked-up more times), but I doubt this'd slow down the code a lot
(I
could be wrong - lemme know).
Trevor
https://lists.gnu.org/mailman/listinfo/bug-lilypond
I know this may sound ridiculous, but how possible is it to do a git
bisect with GUB binaries? As I can't reproduce the problem on my
homebrewed version, perhaps the only way to find it is by examining the
binaries.
Alternatively, would it be possible to make another release and see if
the problem is still there?
Cheers,
MS
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