Hello, Emmanuel Beffara <m...@beffara.org> writes:
> I am facing a severe performance issue with TeX Live: compilation of any > document is an order of magnitude slower with a Guix installed system as > compared to a manual installation. Is anyone confronted to this phenomenon, or > is there a way to fix this ? I also experienced a noticeable slowdown; I don't know how to fix it yet. > I tried doing `strace` on the pdflatex calls to investigate further and it > appears that the behaviours of the two versions are largely different. > Counting the number of system calls of each kind gives the following, for the > most frequent calls: > > - minimal document, Guix version: > > 112860 newfstatat > 10491 getdents64 > 5247 openat > 5246 close > 4397 access > 3141 read > > - minimal document, manual version: > > 2772 read > 90 openat > 72 access > 64 close > 64 newfstatat > 60 getdents64 > > - slideshow, Guix version: > > 2831722 getdents64 > 1538560 newfstatat > 1498287 access > 1415296 openat > 1415295 close > 4283 read > > - slideshow, Guix version: > > 3913 read > 1288 getdents64 > 1136 access > 960 openat > 925 close > 920 newfstatat > > So apparently no file hash is used in the Guix version and a large part of the > `texmf-dist` folder is browsed, probably several times. A ls-R file is generated during profile creation (see `texlive-font-maps' function in "guix/profiles.scm") but it seems it is not read. It may be interesting to compare location and contents of the ls-R files in both installations. Regards, -- Nicolas Goaziou
