i've been periodically trying out native threads, hoping to get full
usage from an SMP sytem. so far, no luck. finally abstracted the problem
into a simple, repeatable form.
the following program creates M threads that each make and quit from N
Sockets to an SMTP_HOST.
java NT SMTP_HOST M N
it always works, for any M, on a uniprocessor, always fails for M>1 on
SMP, sometimes with a shared library load error (!).
only setting THREADS_FLAG=green will stop this behavior.
import java.io.OutputStream;
import java.net.Socket;
public class NT
implements Runnable
{
String host;
int N;
public NT(String h, int n) {
host = h;
N = n;
}
public void run() {
for (int i = 0; i < N; i++)
try {
Socket sock = new Socket(host, 25);
OutputStream out = sock.getOutputStream();
out.write("quit\n".getBytes());
out.close();
}
catch (Exception e) { e.printStackTrace(); }
}
static public void main(String arg[]) {
try {
String host = arg.length > 0 ? arg[0] : "localhost";
int m = arg.length > 1 ? new Integer(arg[1]).intValue() : 10;
int n = arg.length > 2 ? new Integer(arg[2]).intValue() : 1;
NT soak[] = new NT[m];
for (int i = 0; i < m; i++)
soak[i] = new NT(host, n);
for (int i = 0; i < m; i++)
new Thread(soak[i]).start();
}
catch (Exception e) { e.printStackTrace(); }
}
}
> >
> >
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