Hi,
When making sure that the metafun manual processes with lmtx (where we
have sometimes different implementations of macros) I also checked
performance.
When we started with this manual, it was still MKII time so we either
had direct calls or inbetween calls. Especially multiple runs could take
a while (many minutes, iir some 15 depending on how it was run). That
was no fun.
In mkiv with luatex and the built in mp library this dramatically went
down to 18.1 seconds for one run and 14.2 seconds for luajittex, for 428
pages.
This not bad considering that a lots of features are used: thousands of
mp images, a bunch of external images, many fonts, plenty of buffers,
positioning, color, hyperlinks, backgrounds etc. This document uses
plenty of lua so that is why we gain a lot with luajittex.
In lmtx where we dropped jit and have a less performing backend we
expect to need more runtime but in the meantime we're quite okay. Not
only the engine is faster, but also some low level macros benefit a bit
from new features. I don't know how much lua speedup plays a role but
probably not that much. For 448 pages (some 20 more than we had before)
we now need 16.5 seconds and 15.7 when we use the compact font mode. So
we're halfway between luatex and luajittex now. More than 3 seconds of
the runtime is for metapost. (I use the machine as before.)
Hans
PS. If all the stories are true is should be 1 second on a modern apple
at which point differences in measurements become noise but I cannot
check that. Some day I might check it on a rpi 4.
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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