# Juno unreasonably slow at random

**URL:** <https://discourse.julialang.org/t/juno-unreasonably-slow-at-random/7878>\
**Category:** General Usage\
**Tags:** juno\
**Created:** [December 20, 2017, 2:48pm UTC](https://discourse.julialang.org/t/juno-unreasonably-slow-at-random/7878 "2017-12-20T14:48:33Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![baggepinnen](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/baggepinnen/32/693_2.png) [@baggepinnen](https://discourse.julialang.org/u/baggepinnen)\
**Post date:** [December 20, 2017, 2:48pm UTC](https://discourse.julialang.org/t/juno-unreasonably-slow-at-random/7878/1 "2017-12-20T14:48:33Z")

</div>

Since the last update of julia-client, I am experiencing random hiccups of the julia client, often in conjunction with plotting. There is no significant processor load, and when I press ctrl-c I get the following trace

```julia
InterruptException:
in at base/event.jl:73
in handlemsg at Atom/src/comm.jl:163
in at Atom/src/eval.jl:44
in macro expansion at Media/src/dynamic.jl:67 <inlined>
in wait at base/task.jl:181
in wait at base/event.jl:27
in wait at base/event.jl:234
in try_yieldto at base/event.jl:189

InterruptException:
Stacktrace:
 [1] process_events at ./libuv.jl:82 [inlined]
 [2] wait() at ./event.jl:216
 [3] wait(::Condition) at ./event.jl:27
 [4] lock(::ReentrantLock) at ./lock.jl:74
 [5] macro expansion at /local/home/fredrikb/.julia/v0.6/Atom/src/eval.jl:102 [inlined]
 [6] (::Atom.##62#65{Dict{String,Any}})() at ./task.jl:80
fatal: error thrown and no exception handler available.
InterruptException()
jl_run_once at /buildworker/worker/package_linux64/build/src/jl_uv.c:132
process_events at ./libuv.jl:82 [inlined]
wait at ./event.jl:216
task_done_hook at ./task.jl:256
unknown function (ip: 0x7f5e759e6852)
jl_call_fptr_internal at /buildworker/worker/package_linux64/build/src/julia_internal.h:339 [inlined]
jl_call_method_internal at /buildworker/worker/package_linux64/build/src/julia_internal.h:358 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:1926
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1424 [inlined]
finish_task at /buildworker/worker/package_linux64/build/src/task.c:232
start_task at /buildworker/worker/package_linux64/build/src/task.c:275
unknown function (ip: 0xffffffffffffffff)
WARNING: ErrorException
atexit hook threw an error: ErrorException("schedule: Task not runnable")

```

System info

```julia

versioninfo()

Julia Version 0.6.1
Commit 0d7248e2ff (2017-10-24 22:15 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)
  LAPACK: libopenblas64_
  LIBM: libopenlibm
  LLVM: libLLVM-3.9.1 (ORCJIT, haswell)

```

Julia-client: 0.6.6  
Atom version: 1.22.1

---

<div class="post-metadata">

**Author:** ![pfitzseb](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/pfitzseb/32/45566_2.png) [@pfitzseb](https://discourse.julialang.org/u/pfitzseb)\
**Post date:** [December 20, 2017, 3:35pm UTC](https://discourse.julialang.org/t/juno-unreasonably-slow-at-random/7878/2 "2017-12-20T15:35:29Z")

</div>

Next time this happens, can you check Atom’s console (Ctrl-Shift-I) for errors?

Also, can you give some info as to what you were doing when the error occured? Did Juno display the busy indicator in the bottom left?

> [@baggepinnen](#):
>
> often in conjunction with plotting

What plotting package do you use? Does it use the plot pane? Is it interactive?

---

<div class="post-metadata">

**Author:** ![baggepinnen](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/baggepinnen/32/693_2.png) [@baggepinnen](https://discourse.julialang.org/u/baggepinnen)\
**Post date:** [December 22, 2017, 8:57am UTC](https://discourse.julialang.org/t/juno-unreasonably-slow-at-random/7878/3 "2017-12-22T08:57:45Z")

</div>

The problem seems to have gone away since I included Plots when building a sysimage. Plots took 90+ seconds to load on my machine when julia was started with multiple workers (now it’s instant), and I suspect that the `boot mode = cycle` might have been doing something in the background when I was experiencing this. If I do experience this again, I’ll make sure to check the console!

Juno was displaying the busy indicator and I was not using the plotting pane btw, I have never gotten it to work properly. I never managed to have it display more than a single plot, and the behavior of the pane varied a lot between backends so I never learnt how to use it properly since I use multiple backends, often in the same session.

When plotting with Plots and GR as backend, before the first plot appears (in standalone GUI) I always have to do the following commands in order

```julia
plot(...)
closeall()
gui()
# Now the plot appears

```

The following does not work

```julia
plot(...)
gui()

```

The same is not an issue in the REPL. Any thoughts on how I can avoid this?

---

<div class="post-metadata">

**Author:** ![baggepinnen](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/baggepinnen/32/693_2.png) [@baggepinnen](https://discourse.julialang.org/u/baggepinnen)\
**Post date:** [January 3, 2018, 7:31am UTC](https://discourse.julialang.org/t/juno-unreasonably-slow-at-random/7878/4 "2018-01-03T07:31:09Z")

</div>

This happened again. I just launched a fresh Julia session, ran `using OrdinaryDiffEq`. The output in the julia console was the following

```julia
INFO: Recompiling stale cache file /home/fredrikb/.julia/lib/v0.6/Atom.ji for module Atom.
WARNING: using Lazy.remove in module AtomShell conflicts with an existing identifier.

```

With the busy indicator spinning, after several minutes i pressed ctrl-C and got the following

```julia
ERROR (unhandled task failure): InterruptException:
Stacktrace:
 [1] process_events at ./libuv.jl:82 [inlined]
 [2] wait() at ./event.jl:216
 [3] wait(::Condition) at ./event.jl:27
 [4] stream_wait(::Timer, ::Condition, ::Vararg{Condition,N} where N) at ./stream.jl:42
 [5] wait(::Timer) at ./event.jl:357
 [6] (::Base.##300#301{PyCall.##7#8{PyCall.PyObject},Timer})() at ./event.jl:430

```

The busy indicator was still spinning and I pressed ctrl-C again and got

```julia
fatal: error thrown and no exception handler available.
InterruptException()
jl_run_once at /buildworker/worker/package_linux64/build/src/jl_uv.c:132
process_events at ./libuv.jl:82 [inlined]
wait at ./event.jl:216
task_done_hook at ./task.jl:256
unknown function (ip: 0x7f4060164522)
jl_call_fptr_internal at /buildworker/worker/package_linux64/build/src/julia_internal.h:339 [inlined]
jl_call_method_internal at /buildworker/worker/package_linux64/build/src/julia_internal.h:358 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:1926
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1424 [inlined]
finish_task at /buildworker/worker/package_linux64/build/src/task.c:232
start_task at /buildworker/worker/package_linux64/build/src/task.c:275
unknown function (ip: 0xffffffffffffffff)
Julia has stopped: 1

```

The atom developement console displayed the following

```julia
<embedded>:119290 IntersectionObserver.observe(target): target element is not a descendant of root.
TreeView @ <embedded>:119290
misc.coffee [sm]:29 Julia Boot: 85.05s
misc.coffee [sm]:29 Julia Boot: 0.05s
misc.coffee [sm]:29 Julia Boot: 0.13s
misc.coffee [sm]:29 Julia Boot: 0.05s
internal/process/next_tick.js:103 Uncaught (in promise) Array[2]0: 11: nulllength: 2 __proto__ : Array[0]
internal/process/next_tick.js:103 Uncaught (in promise) disconnected
evaluation.coffee [sm]:39 Uncaught (in promise) TypeError: Cannot read property 'type' of undefined
    at evaluation.coffee [sm]:22
    at process._tickCallback (internal/process/next_tick.js:103)

```