On Sun, 19 Jan 2025 at 19:32, luigi scarso <[email protected]> wrote:
> > > On Sun, 19 Jan 2025 at 11:37, Petr Olsak <[email protected]> wrote: > >> Hello >> >> I am testing new luahbtex and comparing it with luatex because I am >> considering to set OpTeX with luahbtex engine instead luatex in TeXlive >> 2025. >> I have found a difference between lautex and luahbtex behavior which I >> am unable to explain why. The difference is shown only when huge number of >> fonts are downloaded by luaotfload and only with selected fonts from >> internet saved to ~/texmf/fonts. And it manifests only as a little delay >> (with luahbtex) during dlownloading the fonts to PDF at the end of the >> document visible if you are watching at the terminal. The PDF result is >> equal, but I am worried that there is a hidden bug in luahbtex because >> the difference is unexpected. >> >> I teseted this with OpTeX macros, they never use mode=harf. So I expect >> the >> same behavior with both engines. The example for testing is somewhat more >> complicated and it is exactly described at >> >> https://tex.stackexchange.com/questions/735071/ >> >> The main question is: why luatex behaves correctly (with no delay during >> downolading fonts) but luahbtex presents a delay in given cases? Where is >> the difference? Can the luatex developers explain this? >> >> Thank you >> >> Petr Olsak >> >> > under linux > /usr/bin/time always reports luahbtex slower of about 5seconds, > but I was not able to find why /where. > > -- > luigi > > Using gprofng https://sourceware.org/binutils/wiki/gprofng I can see that luahbtex spends a relevant time on sweeplist, which means that the lua gc plays an important role here. -- luigi
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