Save complete session snapshot?

kristoffer.carlsson · May 26, 2019, 8:18am

Saving a snapshot is pretty much exactly how the sysimg that is shipped with Julia is built.

JuliaLang/julia/blob/e39f498aca58abb8aecac34d329d7de9a0cead02/sysimage.mk#L75-L82


      
          $$(build_private_libdir)/sys$1-o.a $$(build_private_libdir)/sys$1-bc.a : $$(build_private_libdir)/sys$1-%.a : $$(build_private_libdir)/sys.ji
          	@$$(call PRINT_JULIA, cd $$(JULIAHOME)/base && \
          	if ! $$(call spawn,$3) $2 -C "$$(JULIA_CPU_TARGET)" --output-$$* $$(call cygpath_w,$$@).tmp $$(JULIA_SYSIMG_BUILD_FLAGS) \
          		--startup-file=no --warn-overwrite=yes --sysimage $$(call cygpath_w,$$<) $$(call cygpath_w,$$(JULIAHOME)/contrib/generate_precompile.jl) $(JULIA_PRECOMPILE); then \
          		echo '*** This error is usually fixed by running `make clean`. If the error persists$$(COMMA) try `make cleanall`. ***'; \
          		false; \
          	fi )
          	@mv $$@.tmp $$@

in the Makefile and the contrib/generate_precompile.jl is what we put into the sysimg:

github.com

JuliaLang/julia/blob/master/contrib/generate_precompile.jl

# This file is a part of Julia. License is MIT: https://julialang.org/license

if Threads.nthreads() != 1
    @warn "Running this file with multiple Julia threads may lead to a build error" Threads.nthreads()
end

if Base.isempty(Base.ARGS) || Base.ARGS[1] !== "0"
Sys.__init_build()
# Prevent this from being put into the Main namespace
@eval Module() begin
if !isdefined(Base, :uv_eventloop)
    Base.reinit_stdio()
end
Base.include(@__MODULE__, joinpath(Sys.BINDIR, "..", "share", "julia", "test", "testhelpers", "FakePTYs.jl"))
import .FakePTYs: open_fake_pty
using Base.Meta

CTRL_C = '\x03'
UP_ARROW = "\e[A"
DOWN_ARROW = "\e[B"

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Where the REPL gets started, a few things gets evaluated and some Pkg commands are run. Then a snapshot of that is saved.