Using Debugger in Julia 1.6.3

General Usage
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#1

I am having difficulties using Debugger in Julia 1.6.3. I attempted to run the simple example from Debugger at github and if failed. Can someone suggest what I am doing wrong or a work-around. I do have vscode working, but having to stop and start it every time I change a struct is making code development slow. Thanks.

julia> using Pkg;Pkg.add("Debugger")
julia> function foo(n)
           x = n+1
           ((BigInt[1 1; 1 0])^x)[2,1]
       end
foo (generic function with 1 method)

julia> @enter foo(20)
ERROR: LoadError: UndefVarError: @enter not defined
in expression starting at REPL[25]:1
#2

You need to load Debugger

Julia> using Debugger
1 Like
#3

Sorry, my apologies; however:


julia> function foo(n)
           x = n+1
           ((BigInt[1 1; 1 0])^x)[2,1]
       end
foo (generic function with 1 method)

julia> @enter foo(20)
In foo(n) at REPL[45]:1
 1  function foo(n)
>2      x = n+1
 3      ((BigInt[1 1; 1 0])^x)[2,1]
 4  end

About to run: (+)(20, 1)
1|debug> n
ERROR: UndefVarError: _apply_latest not defined
Stacktrace:
 [1] +(x::Int64, y::Int64)
   @ Base int.jl:87
 [2] foo(n::Int64)
   @ Main REPL[45]:2

julia>
#4

There’s something wrong with your code formatting. Can you put the code inside triple backticks? Now it literally says “blockquote”, which is very odd.

#5

Here’s an explanation how to format your code Please read: make it easier to help you

#6

Just tried the example, worked for me.

#7

Thank you, I requested help on this in “Getting Started”. I will read your suggested link immediately after this reply.

#8

I’m doing something incorrect, but I don’t know what. I just recently downloaded 1.6.3 and am only running the example from the github readme.md. I’m running Ubuntu 20.04 on an old desktop.

Linux home-ubuntu 5.11.0-38-generic #42~20.04.1-Ubuntu SMP Tue Sep 28 20:41:07 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
>

If you have any suggestions on how to debug, I will give them a try. I really want to get Debugger working. Thanks.
p.s. I have been away from julia for a year, but have now decided to use it more (because it’s so much faster than Python).

#9

Where did you get Julia from? Did you download the official binaries?

#10

How’s VS Code any different here from the REPL?

#11

You can edit your previous posts and fix the formatting.

2 Likes
#12

Yes, julia-1.6.3-linux-x86_64.tar.gz from julialang.org

#13

Repl with Debugging should be much faster to try alternatives when developing code. VSCode (well code on ubuntu) is very slow to start up each time you make a change. Also, different functionality. My preference is to run both in parallel, and to use cut and paste with an external editor (for me sublime-text) and at any particular time to use what is most efficient. I expect everyone has their own methodology they get used to.

#14

It might be an Ubuntu issue; I have tried the Debugger example on a couple of Ubuntu 12.04 machines and I get the same failure issue. Unfortuantely, I am too inexperienced with Julia to figure out how to debug it, especially with Debugger not working for me. I expect I am doing something simple incorrecly, but don’t know what it is.

#15

I run both stable (1.6.3) and RC (1.7) Julia on 2 Ubuntu machines (18.04 and 20.04), so this should work. Can you try again on a clean environment (i.e. not the global one) and see if that works?

1 Like
#16

I don’t understand what a clean environment or what the global environment is. Does this mean just start a new repl? Or does it have to do with environment variables in the linux shell?

#17

If I try it in a none-project directory, it works; trying in my project directory fails:

1|debug> n
ERROR: UndefVarError: _apply_latest not defined
Stacktrace:
 [1] +(x::Int64, y::Int64)
   @ Base int.jl:87
 [2] foo(n::Int64)
   @ Main REPL[3]:2
#18

More information: the only change made was to upgrade to 1.7.1 and now Debugger seems to be working in Ubuntu 20.04