Client terminates Gnuplot

Core Library Questions

hegyesi.g..

in Core Library Questions • 20 days ago

Hi,

In my sketch I open Gnuplot to plot some data. I use the " -persist" parameter to make the plot window stay open until I stop the sketch.

Strangely, if I have a network client that receives some data from a server, Gnuplot will terminate after a couple of seconds.

The test code below works fine without a Client (if line 12. is commented out). Could someone replicate the problem? You need, of course, Gnuplot installed.

I'm using Processing 2.0.1 on Win7.

Thanks,

Gyula

Test code:

import processing.net.*;
int myByteArraySize = 10000;
byte[] byteBuffer = new byte[myByteArraySize];
Server myServer;
Client myClient;
void setup() {
size(200, 200);
myServer = new Server(this, 5204);
myClient = new Client(this, "127.0.0.1", 5204);
}
void draw() {
myServer.write(byteBuffer);
}
void mousePressed() {
open("gnuplot -persist -e \"plot sin(x)\"");
}

Replies(1)

hegyesi.g..

Re: Client terminates Gnuplot

19 days ago

Hi,

I've found the simplest code that would kill Gnuplot:

void setup() {
open("gnuplot -p -e \"plot sin(x)\"");
}
void draw() {
}

In Windows Task Manager the value of "Memory (Private Working Set)" that belongs to the java.exe process will slowly (in 1 or 2 minutes) increase to about 27 MB when Gnuplot terminates. This will only happen if in Processing Preferences I tick the checkbox "Increase maximum available memory to" any value (even 1024 MB).

Unchecking the "Increase maximum available memory to" checkbox, the java.exe process will not grow above 18 MB and Gnuplot survives. But if I create 10 MB of dummy data in the draw() loop, Processing will again dump Gnuplot. Even if draw() is tamed by a frameRate(1) command.:

void setup() {
open("gnuplot -p -e \"plot sin(x)\"");
frameRate(1);
}
void draw() {
byte[] byteBuffer = new byte[10000000];
}

I'm using Processing 2.0.3 on Win7/ 2 GB ram.

Any hint would be appreciated.

Thanks,

Gyula

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