Visit Our UNIX and Linux User Community


Truss output


 
Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users Truss output
# 1  
Old 10-08-2014
Truss output

Hi,

I want to trace a background java program which runs in infinite loop. I have used truss command for this.

But the program terminated after some hours with below truss output:

Code:
Received signal #1, SIGHUP, in lwp_cond_wait() [caught]
/1:           siginfo: SIG#0

Please let me know what is the meaning of this.

Thanks
Hara Prasad

Last edited by radoulov; 10-08-2014 at 09:32 AM..
# 2  
Old 10-08-2014
What's your OS? Solaris?

Truss only captures system calls the process makes. If the code that is looping doesn't make any system calls, it won't produce any truss output.
# 3  
Old 10-08-2014
There is also truss on AIX. You should monitor the resources consumed by this process. Could be a ulimit issue. Is there a javacore file?
# 4  
Old 10-09-2014
Thanks for the reply.

OS is SunOS.

Java program is:

Code:
 public void run()
        {
          try
            {
                  String workingDir = System.getProperty("user.dir");
                  while(true)
                  {
                        Runtime.getRuntime().exec(workingDir+"/archiving_receivinglogs.sh");
                        Runtime.getRuntime().exec(workingDir+"/Purging_Logs.sh");
                        Thread.sleep(900000);
                  }
            }

above program, terminates after 3-4 hrs.

Last edited by Don Cragun; 10-24-2014 at 01:37 AM.. Reason: Add CODE tags.
# 5  
Old 10-24-2014
You can't easily truss a java process as you are seeing the JVM's system calls, not the java code within.

That said, the message you are seeing is saying that the HANGUP (HUP) signal was received - you can shield a process from HUP signals (this used to be very important back in the old unreliable days of modem connections that would routinely vanish) by starting you process via 'nohup'
eg
Code:
nohup java -Dblahblah

# 6  
Old 10-24-2014
you could convert what you are doing in your shell script to Java, and do away with the extra "overheads"

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

unable to understand the output of TRUSS command

Hi, I am trying to set ulimit for soft stack unlimited, but this is not taking effect, after tracing the ulimit -a unlimited command, the below output was generated, which i am unable to comprehend. Could any one help me with this? prcbap1-r10prod: truss -d ulimit -s unlimited Tue Dec 30... (2 Replies)
Discussion started by: NasirAbbasi
2 Replies

2. UNIX for Advanced & Expert Users

Truss output interpretation

hi, anyone can help on this piece of truss output? 8094: 0.7028 write(4, 0x0043BE90, 236) = 236 8094: T S H \0\0\0EC020101\0\0\0\0\0\0\0\0\0 "02\0\0 303\0\0 I D 8094: \f %\0\0\0\0 2\0F67F\0\0\0\0 @06FFC99A ; 8094: L D6\0 303 8094: ... (6 Replies)
Discussion started by: ghostdog74
6 Replies

3. UNIX for Dummies Questions & Answers

Truss output

Hi, I want to trace a background java program which runs in infinite loop. I have used truss command for this. But the program terminated after some hours with below truss output: Received signal #1, SIGHUP, in lwp_cond_wait() /1: siginfo: SIG#0 Please let me know what... (0 Replies)
Discussion started by: Hara Prasad
0 Replies

4. AIX

Truss output

Hello, I'm using AIX 5.3.12.5 and trying to understand truss output. I'm running a job with real time of 16 minutes but only 4 minutes of CPU time. I'm trying to understand what the process is doing. I'm getting a lot of kread, kpread, kwrite, kpwrite... localhost:~ x$ grep... (1 Reply)
Discussion started by: Kovacs
1 Replies

5. Shell Programming and Scripting

need help with truss !

i have to gather some info about a process and redirect it to a1.txt file. For this i m using truss command truss -po a1.txt $PID_Detail where $PID_Detail= 1482944 3362976 -------------------------------------------------------------------------- Below the script: #!/bin/ksh for i... (6 Replies)
Discussion started by: ali560045
6 Replies

6. Shell Programming and Scripting

truss output

Hi I have to get redirect the truss ouput to file. I am doing truss -p 12121 >> output.txt But it still displays on the screen adn output.txt is empty Can some help how to do this? Thanks in advance Ammu (1 Reply)
Discussion started by: ammu
1 Replies

7. Shell Programming and Scripting

how to use truss?

Hi all, while trying to debug and figure out why a lofiadm command was not working on my script, i came across a cmd called "truss" all i know about it is that it executes the specified command and produces a trace of the system calls it performs, the signals it receives, and the machine faults... (5 Replies)
Discussion started by: wrapster
5 Replies

8. UNIX for Advanced & Expert Users

truss output

Hi, We keep getting hanging Oracle process for our ETL. The dba's asked me to do o truss. All I see is pages and pages of the following,:cool: pollsys(0xFFFFFFFF7FFF38C8, 1, 0xFFFFFFFF7FFF3800, 0x00000000) = 0 pollsys(0xFFFFFFFF7FFF38C8, 1, 0xFFFFFFFF7FFF3800, 0x00000000) = 0... (0 Replies)
Discussion started by: happyadm
0 Replies

9. IP Networking

truss results

I have tried to analyze the log of truss shown below. I haven't found anything clear for me indicating the problem. The process is the server that accepts client connections. To establish the connection it starts the child thread then it should transfer data. In reality it gets only connection.... (1 Reply)
Discussion started by: gogogo
1 Replies

10. UNIX for Advanced & Expert Users

truss

I'm a DBA so no abuse please! I've for 5 Oracle Forms processes that are spinning and am trying to find out if they're doing anything: Running HPUX 11.11 CPU TTY PID USERNAME PRI NI SIZE RES STATE TIME %WCPU %CPU COMMAND 9 ? 2735 oracle 241 20 24228K 16668K run 2607:29 84.92... (2 Replies)
Discussion started by: fraze
2 Replies

Featured Tech Videos