Date: Wed, 3 Mar 1999 10:03:54 -0800 (PST) From: swohlgemuth@hotmail.com To: freebsd-gnats-submit@freebsd.org Subject: ports/10373: Increasing kernel file descriptors causes jdk1.1.7 to core dump after opening >20## ports Message-ID: <19990303180354.7B90D15548@hub.freebsd.org>
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>Number: 10373
>Category: ports
>Synopsis: Increasing kernel file descriptors causes jdk1.1.7 to core dump after opening >20## ports
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-ports
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Mar 3 10:10:01 PST 1999
>Closed-Date:
>Last-Modified:
>Originator: Sean Wohlgemuth
>Release: 3.1-RELEASE
>Organization:
>Environment:
FreeBSD shadowtroll1.xxx.xxx.com 3.1-RELEASE FreeBSD 3.1-RELEASE #2: Wed Mar 3 09:12:26 PST 1999 root@shadowtroll1.xxx.xxx.com:/usr/src/sys/com
pile/SEANWOKERNEL i386
>Description:
After increasing the max file descriptors in the kernel so that I can test a new server application by simulating thousands of clients, I try to run a java application that opens thousands of persistent connections to the server and the jdk/application core dumps after
>How-To-Repeat:
***KERNEL TUNING***
change kernel to increase file descriptors:
/usr/src/sys/compile/SEANWOKERNEL/param.c
change #define MAXFILES (NPROC * 2) to #define MAXFILES 5000
make depend; make; make install; reboot...
run a java program using JDK1.1.7 to open ~5000 sockets to a server
this results in a coredump after about ~2020 sockets have been opened
***.java file***
/*here is the class file that can make it happen after kernel tunning is complete... change server and port to your own test system*/
import java.net.*;
import java.io.*;
public class Class1
{
public static int iSockets=4000;
public static void main (String[] args)
{
Socket[] m_rgoSocket=new Socket[iSockets];
OutputStream[] m_rgoOutputStream=new OutputStream[iSockets];
int i=0;
int j=iSockets;
try{
for (i=0; i<iSockets; i++){
m_rgoSocket[i] = new Socket("www.yahoo.com", 80);
m_rgoOutputStream[i] = m_rgoSocket[i].getOutputStream();
System.out.print(i+" ");
System.out.flush();
}//endfor
}
catch (UnknownHostException e){}
catch (IOException e1){
System.out.println();
System.out.println("IOException:"+e1);
j=i-1;
}//endcatch
System.out.println("Sockets opened successfully: "+i);
System.out.println("Closing open sockets...");
try{
for (i=0; i<j; i++){
m_rgoSocket[i].close();
}//endfor
}catch (IOException e){
}//endcatch
System.out.println("Done");
try{
System.in.read();
}catch (IOException e){}
}//endmethod
}//endclass
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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