Revise drastically slowing down all julia functionality after dev package is loaded

[IanButterworth]

I'm seeing a drastic slowdown in all julia interaction after a dev package is imported, where Revise was imported in advance. Maybe this is also linked to #206 which I'm experiencing

Revise v0.7.12
Seen in Version 1.0.2 and Version 1.1.0-DEV.655 (2018-11-13)

Session with Revise.jl

> using Revise
 #takes a couple of seconds to complete

> 1
1 #<< 1 second

> @time 1
 0.000001 seconds (3 allocations: 144 bytes)
1 #<< 1 second

> using DevPackage
[ Info: Precompiling DevPackage [bb1973f0-dbbf-11e8-231b-73219c4de986]

> 1
1 #Hangs for ~ 10 seconds before returning

> @time 1
  0.000008 seconds (4 allocations: 160 bytes) #Hangs for 10 seconds before returning this line
1 #This line immediately after

Session without Revise.jl

> 1
1 #<< 1 second

> @time 1
 0.000001 seconds (3 allocations: 144 bytes)
1 #<< 1 second

> using DevPackage
[ Info: Precompiling DevPackage [bb1973f0-dbbf-11e8-231b-73219c4de986]

> 1
1 #About 1 second first time after above import

> 1
1 #<< 1 second

> @time 1
  0.000001 seconds (3 allocations: 144 bytes)
1 #<< 1 second

[IanButterworth]

This seems to be linked to overuse of broad using's in my DevPackage. i.e. instead of using PyPlot I'm changing to using PyPlot: plot, figure, subplot, imshow

I see normal execution speeds for basic operations now following using Revise;using DevPackage

But is this expected behavior? For instance, is Revise triggered to poll for file changes in imported packages each time anything is executed?

[timholy]

Can you post DevPackage? The thing to do here is try to strip it down to bare essentials.

I'm a bit skeptical that it's the using A: b, c, d, e, ... statement in and of itself (though of course if there's a Julia bug, anything is possible). To me, a more likely culprit is the following: DevPackage redefines some Base method that also gets used by Revise. As a consequence, methods in Revise (which run on every REPL cycle) need to be recompiled after you load the package.

[IanButterworth]

Unfortunately I can't make DevPackage public, but these are all the global elements in the package:
However, in this format there's basically no delay in execution.

VERSION < v"0.7.0-beta2.199" && __precompile__(false)

module DevPackage

using ImageFiltering: KernelFactors, imfilter
using StatsBase: percentile
using PyPlot: plot, figure, subplot, imshow, plt, xlim, ylim, title, xlabel, ylabel
using Images, ProgressMeter, FileIO, Colors, CSV, DataFrames, Dates, TimeZones
using VideoIO
using SubpixelRegistration

using PyCall
const DevPythonPackage = PyNULL()

function __init__()
    pushfirst!(PyVector(pyimport("sys")["path"]), @__DIR__)
    copy!(DevPythonPackage, pyimport("DevPythonPackage"))
end

const ffmpeg = "ffmpeg"           #name of ffmpeg executable

# Plus uniquely named struct definitions and uniquely named functions

end

[timholy]

I can't test this precisely without DevPythonPackage, but if I comment out your __init__ function then I can't replicate this.

Are you on Windows by any chance? See e.g. JuliaGraphics/Gtk.jl#325

[IanButterworth]

I'm on MacOS, and unfortunately (from a debugging perspective) the issue has completely disappeared unexplainably. I've tried to roll back to figure out what it was but no luck.