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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
 

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LEARN ABOUT DEBIAN

rgb2pct

rgb2pct(1)						      General Commands Manual							rgb2pct(1)

NAME

       rgb2pct - rgb2pct.py Convert a 24bit RGB image to 8bit paletted

SYNOPSIS

       rgb2pct.py [-n colors | -pct palette_file] [-of format] source_file dest_file

DESCRIPTION

       This utility will compute an optimal pseudo-color table for a given RGB image using a median cut algorithm on a downsampled RGB histogram.
       Then it converts the image into a pseudo-colored image using the color table. This conversion utilizes Floyd-Steinberg dithering (error
       diffusion) to maximize output image visual quality.

       -n colors:
	   Select the number of colors in the generated color table. Defaults to 256. Must be between 2 and 256.

       -pct palette_file:
	   Extract the color table from palette_file instead of computing it. Can be used to have a consistant color table for multiple files. The
	   palette_file must be a raster file in a GDAL supported format with a palette.

       -of format:
	   Format to generated (defaults to GeoTIFF). Same semantics as the -of flag for gdal_translate. Only output formats supporting
	   pseudocolor tables should be used.

       source_file:
	   The input RGB file.

       dest_file:
	   The output pseudo-colored file that will be created.

       NOTE: rgb2pct.py is a Python script, and will only work if GDAL was built with Python support.

EXAMPLE

       If it is desired to hand create the palette, likely the simpliest text format is the GDAL VRT format. In the following example a VRT was
       created in a text editor with a small 4 color palette with the RGBA colors 238/238/238/255, 237/237/237/255, 236/236/236/255 and
       229/229/229/255.

       % rgb2pct.py -pct palette.vrt rgb.tif pseudo-colored.tif
       % more < palette.vrt
       <VRTDataset rasterXSize="226" rasterYSize="271">
	 <VRTRasterBand dataType="Byte" band="1">
	   <ColorInterp>Palette</ColorInterp>
	   <ColorTable>
	     <Entry c1="238" c2="238" c3="238" c4="255"/>
	     <Entry c1="237" c2="237" c3="237" c4="255"/>
	     <Entry c1="236" c2="236" c3="236" c4="255"/>
	     <Entry c1="229" c2="229" c3="229" c4="255"/>
	   </ColorTable>
	 </VRTRasterBand>
       </VRTDataset>

AUTHOR

       Frank Warmerdam warmerdam@pobox.com

GDAL
								  Tue Sep 18 2012							rgb2pct(1)
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