Sponsored Content
Full Discussion: Truss output interpretation
Top Forums UNIX for Advanced & Expert Users Truss output interpretation Post 302921546 by ghostdog74 on Saturday 18th of October 2014 07:05:04 AM
Old 10-18-2014
Quote:
Originally Posted by Don Cragun
OK. So you're sending a request to a server on a socket and immediately after sending the request, you try to read a response from the server with NDELAY set in the socket options. There is no server and no network that can respond that fast to a request.

There are a couple of obvious things you could try:
  1. Drop the TCP_NDELAY socket option so the read() will wait for data instead of returning immediately if no data is present.
  2. Drop the 1st read() and start with the poll() or pollsys() to wait for data to be present before attempting the read().
I haven't tried to evaluate the arguments to pollsys() to see if your program is waiting for data on a group of file descriptors or just waiting for data on fd #4. If it is just waiting for data on fd #4, I would start by trying #1; but if your program can continue processing if data is available on another file descriptor as well, choose option 2.

With what you have shown us there is no way for us to guess why it is taking more than 24 seconds for the server to respond to your request.

hi, thanks for reply
I have setup my own client and server on two test Solaris VMs, and my client app is able to connect to server and process data just fine. The difference is that, the test network has only one routing path and there are no intermediate routers/firewalls etc in between my client and server.

However, at my workplace, the environment is different. my production client and server VMs have multiple interfaces and so have many different routes. I am beginning to suspect it could be routing mis configuration that result in non optimal routes, or intermediate firewalls/switches causing the delay. So far, all i could think of is comparing the tcp and ip settings ( using ndd ) to that of production and see what can be fine tuned.

The client and server apps are proprietary, so I have no way to change any code.
thanks
 

10 More Discussions You Might Find Interesting

1. 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

2. 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

3. 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

4. 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

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. AIX

lspath output interpretation

On my VIo I see the following for my disks: $ lspath | grep hdisk6 Enabled hdisk6 fscsi0 200600a0b82193f7,4000000000000 Enabled hdisk6 fscsi0 200700a0b82193f7,4000000000000 Enabled hdisk6 fscsi2 200600a0b82193f8,4000000000000 Failed hdisk6 fscsi2 200700a0b82193f8,4000000000000 $ lspath |... (8 Replies)
Discussion started by: petervg
8 Replies

7. 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

8. 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

9. UNIX for Advanced & Expert Users

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... (5 Replies)
Discussion started by: Hara Prasad
5 Replies

10. 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
bubbros-server(6)						   Games Manual 						 bubbros-server(6)

NAME
bubbros-server - the bub-n-bros server. SYNOPSIS
bubbros-server [ level-file.bin ] [options] DESCRIPTION
bubbros-server starts an http server that acts as a control panel for the server. The server listens on port 8000 by default. The url for the control panel is http://server:port/0xN where 0xN is a random hex number (acts as minimal protection). This url is printed when the server starts. You can start and view games and kill the server from this panel. The control panel also allows you to type in the address of a server to connect to, the script will then open a client to that server. The http server also servers java applet clients for those players who wish to use one. When a game is started the script opens a port for the game server. This port can then be connected to by a client. Clients autodetect servers running on the local network with UDP ping on port 8056. Connection forming The client forms a tcp connection to the server. Or, when using the metaserver, the server forms a connection to the client. If this fails, the client and server try a simultaneous SYN connect. This sometimes works if the server and client are behind firewalls. The server then tries to transmit the data over udp. If it gets no response from the client it will fall back to the existing tcp connection. OPTIONS
-b N, --begin N, --start N Start at board (level) number N. The default is 1. See also the -s option. -h, --help Display help. -i, --infinite Restart the server at the end of the game. Normally the server quits after a certain period of inactivity. This is useful when used with the -m option to make a public server that is available for a long time. -l N, --lives N Limit number of lives to N. If this option is not specified the number of lives will be infinite. -m, --metaserver Register server with the Metaserver (currently) at codespeak.net:8050. This makes your server visible to everybody, and also facil- itates joining through a fascistic firewall. --port TYPE=N Sets default listening ports. If type is LISTEN , sets the game server port to N. The game server port is chosen randomly by default. If the type is HTTP , sets the http server port to N. The http server port defaults to 8000. Another port will be chosen if none was specified and 8000 is already in use. The server also listens to UDP ping on port 8056. -s N, --step N Increase board number with N when a board is completed. Defaults to 1. see also the -b option. OUTPUT
The server outputs helpful debug information concerning the http and game servers. SEE ALSO
bubbros(6) bubbros-client(6) December 7, 2007 bubbros-server(6)
All times are GMT -4. The time now is 07:46 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy