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Full Discussion: help in setting up values
Top Forums Shell Programming and Scripting help in setting up values Post 302690879 by learnbash on Thursday 23rd of August 2012 01:19:40 PM
Old 08-23-2012
help in setting up values

I have server, i want to tune some storage below are my issues.

1. There is a directory

Code:
/sys/block/

There are directories starting with name emcpow* under that there is a directory queue, inside that there is file nr_requests

This is complete path

Code:
/sys/block/emcpowerbj/queue/nr_requests

i want to change all "[/sys/block/emcpow*/queue/nr_requests]" to like that

Code:
echo "100000" > /sys/block/emcpow*/queue/nr_requests

2. same thing i want to apply to all emcpow*

Code:
echo "noop" > /sys/block/emcpow*/queue/scheduler

3. another thing i want to set all emcpow* value to /dev/emcpow* to like that

Code:
blockdev --setra 16384 /dev/emcpow*

---------- Post updated at 12:19 PM ---------- Previous update was at 12:18 PM ----------

point 1 & 2 are almost same, but different is point 3. Please help me out.
 

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ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME
ppmtosixel - convert a portable pixmap into DEC sixel format SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC LJ250 color inkjet printer. If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file. OPTIONS
-raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com- pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni- tude larger than a compressed file and prints much slower. -margin If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci- fied, a 1.5 inch left margin will offset the image. PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?. BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation. SEE ALSO
ppm(5) AUTHOR
Copyright (C) 1991 by Rick Vinci. 26 April 1991 ppmtosixel(1)
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