root@ubuntu:julia-1.8.0#ls
base          CITATION.cff  contrib          deps  etc         julia            LICENSE.md  Make.inc   NEWS.md    src     sysimage.mk  THIRDPARTY.md  usr-staging
CITATION.bib  cli           CONTRIBUTING.md  doc   HISTORY.md  julia.spdx.json  Makefile    Make.user  README.md  stdlib  test         usr            VERSION
root@ubuntu:julia-1.8.0#make
……
Warning: git information unavailable; versioning information limited
    JULIA usr/lib/julia/corecompiler.ji
Core.Compiler ──── 124.924 seconds
    JULIA usr/lib/julia/sys.ji
coreio.jl
exports.jl
...
Generating REPL precompile statements... 25/40
Generating REPL precompile statements... 26/40
Generating REPL precompile statements... 27/40
Generating REPL precompile statements... 28/40
Generating REPL precompile statements... 29/40
Generating REPL precompile statements... 30/40
Generating REPL precompile statements... 31/40

root@ubuntu:~# ps -ef|grep julia
root       8652  61069  0 15:19 pts/2    00:00:00 make -s -C /root/julia-1.8.0 -f sysimage.mk sysimg-release
root       8820   8652  0 15:19 pts/2    00:00:00 /bin/sh -c printf '    %b %b\n' "\033[32;1m"JULIA"\033[0m" "\033[37;1m"usr/lib/julia/sys-o.a"\033[0m";  cd /root/julia-1.8.0/base && if ! JULIA_BINDIR=/root/julia-1.8.0/usr/bin WINEPATH="/root/julia-1.8.0/usr/bin;$WINEPATH" JULIA_NUM_THREADS=1  /root/julia-1.8.0/usr/bin/julia -O3 -C "generic" --output-o /root/julia-1.8.0/usr/lib/julia/sys-o.a.tmp  --startup-file=no --warn-overwrite=yes --sysimage /root/julia-1.8.0/usr/lib/julia/sys.ji /root/julia-1.8.0/contrib/generate_precompile.jl 1; then echo '*** This error is usually fixed by running `make clean`. If the error persists, try `make cleanall`. ***'; false; fi
root       8821   8820  2 15:19 pts/2    00:00:23 /root/julia-1.8.0/usr/bin/julia -O3 -C generic --output-o /root/julia-1.8.0/usr/lib/julia/sys-o.a.tmp --startup-file=no --warn-overwrite=yes --sysimage /root/julia-1.8.0/usr/lib/julia/sys.ji /root/julia-1.8.0/contrib/generate_precompile.jl 1
root      11050  11004  0 15:32 pts/1    00:00:00 grep --color=auto julia