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:
- Drop the TCP_NDELAY socket option so the read() will wait for data instead of returning immediately if no data is present.
- 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
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LEARN ABOUT DEBIAN
rfio_setbufsize
RFIOSETOPT(3) Rfio Library Functions RFIOSETOPT(3)
NAME
rfiosetopt - set RFIO options
SYNOPSIS
#include <sys/types.h>
#include "rfio_api.h"
int rfiosetopt (int opt, int *pval, int len)
int rfio_setbufsize (int s, int bufsize)
DESCRIPTION
rfiosetopt sets the RFIO option opt to the content of the memory cell pointed by pval.
rfio_setbufsize sets the size of the readahead buffer to be used on a particular socket connection.
opt can have on of the following values:
RFIO_READOPT
The value pointed by pval can be 0, RFIO_READBUF, RFIO_READAHEAD or RFIO_STREAM (V3).
If set to zero, a normal read will be used (one request to the server per read).
If set to RFIO_READBUF, an internal buffer is allocated in the client API, each call to the server fills this buffer and the
user buffer is filled from the internal buffer. There is one server call per buffer fill.
If set to RFIO_READAHEAD, an initial call is sent to the server which pushes data to the client buffer until end of file is
reached or an error occurs or a new request comes from the client. There is no intermediate buffer unless RFIO_READ-
BUF|RFIO_READAHEAD is specified.
If RFIO_STREAM is set, the V3 protocol is enabled. This uses 2 socket connections between the client and the server and the
server itself is multi-threaded allowing overlap of disk and network operations. The data is pushed on the data socket until
end of file is reached or an error occurs. The transfer can be interrupted by sending a packet on the control socket.
Default is RFIO_READBUF.
The default internal buffer size is 128kB, but the buffer size can be set with an entry RFIO IOBUFSIZE in shift.conf or thru
the environment variable RFIO_IOBUFSIZE.
RFIO_NETOPT
The value pointed by pval can be RFIO_NONET or RFIO_NET. If set to RFIO_NONET, the NET entries in shift.conf are ignored.
Default is RFIO_NET.
RFIO_NETRETRYOPT
The value pointed by pval can be RFIO_RETRYIT or RFIO_NOTIME2RETRY.
If set to RFIO_RETRYIT, there will be retries on failing connect. The number of retries is given by the environment variable
RFIO_CONRETRY or the RFIO CONRETRY entry in shift.conf. The retry interval (in seconds) is given by the environment variable
RFIO_CONRETRYINT or the RFIO CONRETRYINT entry.
If set to RFIO_NOTIME2RETRY, there will be no retry on failing connect.
Default is RFIO_RETRYIT.
RFIO_CONNECTOPT
The value pointed by pval can be RFIO_NOLOCAL or RFIO_FORCELOCAL. If set to RFIO_FORCELOCAL, no parsing is done on pathname.
The file is assumed to be local. Default is RFIO_NOLOCAL.
The len argument is ignored.
s is the file descriptor of the receiving socket.
bufsize is the size of the readahead buffer to be used.
RETURN VALUE
rfiosetopt returns 0 if the operation was successful or -1 if the operation failed. In the latter case, serrno is set appropriately.
ERRORS
ENOMEM buffer could not be allocated.
EINVAL opt is not a valid option, bufsize is negative or the user tries to change the buffer size after the actual I/O has started.
SEE ALSO
rfio_open(3), rfioreadopt(3)
AUTHOR
LCG Grid Deployment Team
LCG
$Date: 2010-02-15 10:01:40 +0100 (Mon, 15 Feb 2010) $ RFIOSETOPT(3)