Hi,
This is a report of test.
> I'll try your suggestion and report the result in a few days.
> First, I'll set 2000 for the argument of Session#setServerAliveInterval(int
> milliseconds).
(1) Result
Session#setServerAliveInterval(int milliseconds) didn't seem to
make good change in my trouble.
(2) Test detail
I rebuilt test program, which can easily occur the trouble.
It ocuurs in 1 hour run by below source with jsch-1.0.42.
The test program checks the time to execute "ls -la".
Normally it ends in 80ms, but sometimes it takes more than 3000ms.
This trouble occurs in a hour, and Session#setServerAliveInterval()
doesn't affected this trouble.
(3) Test complete source
--------------------------------------------
import com.jcraft.jsch.*;
import java.awt.*;
import javax.swing.*;
import java.io.*;
import java.sql.*;
public class Exec{
public static void main(String[] arg) throws Exception{
int sessionNum = 100;
Session[] sessions = new Session[ sessionNum ];
try{
JSch jsch=new JSch();
String host="****";
String user="****";
String passwd = "****";
for( int i=0; i<sessions.length; i++ ){
Session thisSession=jsch.getSession(user, host, 22);
thisSession.setPassword( passwd );
sessions[i] = thisSession;
java.util.Hashtable config = new java.util.Hashtable();
config.put( "cipher.s2c", "aes128-cbc,3des-cbc,blowfish-cbc");
config.put( "cipher.c2s", "aes128-cbc,3des-cbc,blowfish-cbc");
config.put( "StrictHostKeyChecking", "no");
thisSession.setConfig( config );
thisSession.setTimeout( 2000 );
// TCP/IP check setting
thisSession.setServerAliveInterval( 2000 );
// connect
thisSession.connect();
}
long average = 0;
int loop = 0;
boolean canContinue = true;
while( canContinue ){
int idx = loop % sessionNum;
Session thisSession = sessions[ idx ];
Channel channel = null;
channel=thisSession.openChannel("exec");
((ChannelExec)channel).setCommand( "ls -la" );
( (ChannelExec)channel ).setPty( true );
ByteArrayOutputStream baos = new ByteArrayOutputStream();
channel.setOutputStream( baos );
InputStream in=channel.getInputStream();
long start = System.currentTimeMillis();
channel.connect();
byte[] tmp=new byte[1024];
while(true){
long end = System.currentTimeMillis();
if(channel.isClosed()){
average += ( end - start );
Timestamp ts = new Timestamp( end );
if( idx==0 ){
System.out.print( "\n[" + idx + "] " + ts.toString() );
} else if( idx == (sessionNum-1) ){
System.out.print( ", average=" + (average/sessionNum) + "ms" );
average = 0;
} else if( ( idx % 10 ) == 0 ) {
System.out.print( "." );
}
break;
}
try{Thread.sleep( 10 );}catch(Exception ee){}
if( ( end - start ) > 30000 ){
System.out.println( (end-start) + "ms, more than 30sec, break");
canContinue = false;
break;
}
}
channel.disconnect();
// loop counter
loop++;
}
} catch(Exception e){
e.printStackTrace();
}finally{
for( int i=0; i<sessionNum; i++ ){
sessions[i].disconnect();
}
}
}
}
--------------------------------------------
(4) The stdout at problem
[0] 2010-01-12 16:46:56.109........., average=79ms
[0] 2010-01-12 16:47:04.038........., average=78ms
[0] 2010-01-12 16:47:11.926........., average=76ms
....
[0] 2010-01-12 17:37:42.072........., average=74ms
[0] 2010-01-12 17:37:49.588....30002ms, more than 30sec, break
Sincerely,
----------------------------------
Yukimasa Matsuda
Quatre-i Science Co., Ltd.
e-mail: [email protected]
http://www.i4s.co.jp
----------------------------------
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