Re: Fast execution of scripts

Old problem, already solved:

http://www.martiansoftware.com/nailgun/

On 15 February 2015 at 12:36, Oliver Ruebenacker <[email protected]> wrote:

>
>      Hello,
>
>   Clever idea. The obvious drawback is that you are now running two JVMs,
> one for the server and one for the client. JVMs can be rather big,
> depending on your setup. Also, if two clients ever want to run
> simultaneously on the same machine, they'd conflict over network ports.
>
>   It is an interesting question why your client runs so much faster. It
> still needs on every invocation to start up a new JVM and load the Java
> runtime classes. The only reason I can think of is that is does not need to
> load the Scala runtime and Scala compiler classes each time. But two
> seconds seems like a long time for this.
>
>   Probably the scala command can be made a lot faster by reading the Scala
> runtime and compiler classes from a faster disk, maybe even a RAM disk.
>
>   It would be awesome if the scala command could be made to avoid starting
> a new JVM each time.
>
>      Best, Oliver
>
> On Sun, Feb 15, 2015 at 1:39 AM, SpiderPig <[email protected]> wrote:
>
>> I often use Scala in script mode and have always been annoyed at the slow
>> compile speed. It takes about 2 - 3 seconds for a script (run with "scala
>> script.scala") to start.
>> But recently I learned there is a way to start a scala script much faster.
>>
>> Here is some example code that demonstrates this. First you start
>> ScriptServer.scala and afterwards you can run any scala script with "java
>> RunScript script.scala". The first time it still takes 2 seconds but all
>> future invocations run in less than 200 ms.
>> Now that raises the question if it is possible to add a command line
>> option to scala that lets you run scripts that fast. There probably is some
>> drawback to this approach I'm not aware of but I'm guessing it would work
>> at least for most small scripts.
>>
>> ScriptServer.scala:
>> import javax.script._
>> import java.net._
>>
>> val engine = new ScriptEngineManager().getEngineByName("scala")
>>
>> val ss = new ServerSocket(10123)
>>
>> while(true) {
>>   val so = ss.accept()
>>   val in = scala.io.Source.fromInputStream(so.getInputStream)
>>   val script = engine.asInstanceOf[Compilable].compile(in.mkString)
>>   script.eval()
>> }.
>>
>> RunScript.java:
>> import java.io.PrintWriter;
>> import java.net.Socket;
>> import java.nio.file.*;
>> import java.util.List;
>>
>> public class RunScript {
>>   public static void main(String[] args) throws Exception {
>>     String name = args[0];
>>     List<String> lines = Files.readAllLines(Paths.get(name));
>>     PrintWriter out = new PrintWriter(new Socket("localhost",
>> 10123).getOutputStream());
>>     for(String line: lines) {
>>       out.println(line);
>>     }
>>     out.flush();
>>     out.close();
>>   }
>> }
>>
>>
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>
>
>
> --
> Oliver Ruebenacker
> Solutions Architect at Altisource Labs <http://www.altisourcelabs.com/>
> Be always grateful, but never satisfied.
>
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-- 
Kevin Wright
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"My point today is that, if we wish to count lines of code, we should not
regard them as "lines produced" but as "lines spent": the current
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