Re: Re: Fast execution of scripts

On Sun, Feb 15, 2015 at 12:19 PM, SpiderPig <[email protected]> wrote:

> But I want to be able to change the script and still have it start up
> nearly instantly. The default script runner doesn't do that no matter what
> arguments you pass to it.
>

The script runner already does what you suggest! Here is the commit that
added it in 2006:


https://github.com/scala/scala/commit/31ea434a66b6e300c4c372fd4c72919a5f0bceb3

At the head of 2.11.x, here is a good starting point for reading this code:


https://github.com/scala/scala/blob/2.11.x/src/compiler/scala/tools/nsc/ScriptRunner.scala#L63

I just tested on my machine using 2.11.2, and the functionality is still
working properly. Here are the timings I get to compile and run a small
script:

    first run: 2.4 seconds
    second run: 0.6 seconds
    third run: 0.5 seconds
    using -save: 0.2 seconds

Perhaps it isn't happening on your machine, or perhaps you can find a way
to trim the timings down even further. Either way, I am sure that your help
on improving it would be welcome.

Lex

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