CODEWITHSUNDEEP
performancemathjulia
Alex Craft
Alex Craft

Reputation: 15336

Long first time to plot with Gadfly

I created simple plotting example with Julia

using Gadfly
draw(SVG("example.svg", 10cm, 10cm),
  plot(x=rand(10), y=rand(10))
)

And ran it as time julia example.jl it took it 27 sec to finish. Is it normal behaviour? Is it possible to speed it up?

Latest Julia 0.5.2 and Pkg.

Upvotes: 0

Views: 522

Answers (2)

HarmonicaMuse
HarmonicaMuse

Reputation: 7893

I have tried to do the same example with GR.jl as suggested by @daycaster and got 3.3 seconds on one laptop with Windows 10 64 bits:

PS C:\Users\dell\plot_example> cat plot.jl
using GR
plot(rand(10), rand(10), size = (500, 500))
savefig("plot.svg")

PS C:\Users\dell\plot_example> Measure-Command {julia plot.jl}


Days              : 0
Hours             : 0
Minutes           : 0
Seconds           : 3
Milliseconds      : 382
Ticks             : 33822083
TotalDays         : 3.91459293981481E-05
TotalHours        : 0.000939502305555556
TotalMinutes      : 0.0563701383333333
TotalSeconds      : 3.3822083
TotalMilliseconds : 3382.2083

Version and CPU:

PS C:\Users\dell\plot_example> julia -q
julia> VERSION
v"0.5.1"

julia> Sys.cpu_info()[]
Intel(R) Core(TM) i5-6300HQ CPU @ 2.30GHz:
        speed         user       nice        sys       idle        irq ticks
     2304 MHz   18360406          0   10161406  218911218    2123421 ticks

Example plot:

enter image description here

Upvotes: 2

niczky12
niczky12

Reputation: 5063

I'm not an expert so take this with a pinch of salt, but you're draw and SVG functions are compiled the first time they're run, that's why the long running time. If you call the function again, it takes a lot less time. You're paying a penalty to compile the function calls first, but all later executions are quite quick.

I amended you're script to measure the time spent in different calls:

@time using Gadfly
@time draw(SVG("example.svg", 10cm, 10cm),
  plot(x=rand(10), y=rand(10))
)
@time draw(SVG("example2.svg", 10cm, 10cm),
  plot(x=rand(10), y=rand(10))
)

Running this from the console with julia example.jl gives me the following:

$ julia example.jl
2.728577 seconds (3.32 M allocations: 141.186 MB, 10.29% gc time)
20.434172 seconds (27.48 M allocations: 1.109 GB, 1.95% gc time)
0.023084 seconds (32.59 k allocations: 1.444 MB)

Upvotes: 5

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