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Full Discussion: Truss output interpretation
Top Forums UNIX for Advanced & Expert Users Truss output interpretation Post 302921541 by Don Cragun on Saturday 18th of October 2014 03:39:16 AM
Old 10-18-2014
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.
 

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LEARN ABOUT DEBIAN

gems-server

GEMS-SERVER(1)							gems documentation						    GEMS-SERVER(1)

NAME

       gems-server - Transmit a shell session in real time.

SYNOPSIS

       gems-server [-ip ip] [-port p] [-maxconn n] [-wait m] [-log dest] [-noscript] [-script_bin script]

       gems-server -h | -v

DESCRIPTION

       Transmits a shell session to be shown in real time in various different computers or terminals.

       gems-server  transmits data in real time to clients via a network connection. Each one of these clients must run the gems-client(1) program
       to establish connection and receive the transmitted data. Clients can connect and disconnect at any given time, but  of	course	they  will
       only receive the data that is transmitted while they are connected (just like a radio transmission/reception system).

       The  gems  system is normally used to transmit a console session and show it in various computers at the same time, but it is also possible
       to transmit any other kind of data.

OPTIONS

       -ip    IP address where connections will be accepted.

       -port  TCP port. Default: 6666.

       -maxconn
	      Do not accept more than n simultaneous clients. Default: 25.

       -wait  Wait until m clients are connected before starting the transmission. This is useful to ensure that the first m clients will  receive
	      all data transmitted. The default behavior is to start transmission immediately, without waiting for client connections.

       -log   By  default,  the server does not write log messages. This option configures the destination of logs. The dest argument can be `sys-
	      log' (to log through syslogd(8)), `stderr' (to log through standard error output), or it can be an arbitrary filename (log  messages
	      will be appended to the file, if it exists).

       -noscript
	      By  default,  the  server  executes the script(1) program to take terminal data and transmit it. When this option is used the server
	      will not run script, and data will be read form standard input.

       -script_bin
	      Specifies the location of the script(1).	program. Default: /usr/bin/script.

       -h     Show a short help message.

       -v     Show version information.

FILES

       /var/lock/gems-server.PORT
	      Lock file.  gems-server creates this file on initialization and deletes it on exit. PORT is replaced by the TCP  port  used.   gems-
	      server will not run if this file is already present in the system.

AUTHORS

       Diego Essaya <dessaya@fi.uba.ar>

       Emiliano Castagnari <ecastag@fi.uba.ar>

SEE ALSO

       gems-client(1), script(1), syslogd(8)

gems								    AUGUST 2004 						    GEMS-SERVER(1)
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