05-26-2003
What version of Solaris are you running? The connection fudge factor may be scaling out of control for you.
Performance addressing: Threading will add some performance problems since it's constantly opening and closing the fd. Blocking is the correct way to address threaded writes to a fd (since it will wait for all oddities of tcp)- In comparing a read / write test of 1024 bytes in Stevens' UNIX Network Programming (1998), you see how an un blocked, non threaded program took 8.8 seconds to transfer, while a non threaded version with out blocking, did the same xfer in .3 seconds. Hardware in place were all 100 fe switches.
That book is an excellent resource for performance issues that are difficult to spot.
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LEARN ABOUT ULTRIX
tcp-env
tcp-env(1) General Commands Manual tcp-env(1)
NAME
tcp-env - set up TCP-related environment variables
SYNOPSIS
tcp-env [ -rR ] [ -ttimeout ] program [ arg ... ]
DESCRIPTION
The input for tcp-env must be a TCP connection. tcp-env finds out information about that connection, puts the information into several
environment variables as described in tcp-environ(5), and runs program with the given arguments.
Usually tcp-env is run from inetd. It might instead be run from another server that already sets up the right environment variables; if
PROTO is set to TCP when tcp-env is invoked, tcp-env assumes that all the other variables are set up properly, and it does not check
whether the input is a TCP connection.
OPTIONS
-r (Default.) Attempt to obtain TCPREMOTEINFO from the remote host.
-R Do not attempt to obtain TCPREMOTEINFO from the remote host.
-ttimeout
Give up on the TCPREMOTEINFO connection attempt after timeout seconds. Default: 30.
SEE ALSO
tcp-environ(5), inetd(8)
tcp-env(1)