10-25-2005
SAR -b interpretation
I have used SAR -b to get some Unix cache / buffer metrics and the results are confusing me a bit.
The pread/s & pwrit/s are showing 0. However the lread/s and lwrit/s are showing figures. I note also that the bread/s and bwrit/s are showing figures. I believe that pread/s and pwrit/s is not used in SAR but rather bread/s and bwrit/s are used instead - is this correct ?
What is the difference between logical read/writes and physical read/writes to the Unix cache / buffer ? I though a logical read / write was to the buffer but a physical one was to the disk itself ?
Also why is bread/s & bwrit/s considerably less that lread/s and lwrit/s ? Does the bread and bwrit figures indicate the nos of unix blocks and hence encapsulate a number of the logical reads & writes reported by the lread and lwrite figures ?
9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I executed the following command in the korn shell:
$ variable1="qwerty" ls | sort
and the shell executed the 'ls | sort' command.
I would have expected an error message from the shell, but instead of that the shell ran the 'ls | sort' command and didn't realize the variable assignement. ... (1 Reply)
Discussion started by: PhilippeCrokaer
1 Replies
2. AIX
hello
with a sar i have this result:
System configuration: lcpu=48 ent=4.00
14:06:37 %usr %sys %wio %idle physc %entc
14:06:39 26 9 3 62 1.63 40.7
14:06:41 26 9 3 63 1.58 39.4
14:06:43 ... (0 Replies)
Discussion started by: pascalbout
0 Replies
3. IP Networking
Hi Guys,
This is really really urgent. Am looking out for some quick answers.
I'm developing a DNS Resolver client that interprets DNS Query repsonses & pass on the needful to DNS applications.
When an ENUM query(modified to an nslookup naptr query) is issued & an NAPTR RR(Resource Record)... (1 Reply)
Discussion started by: smanu
1 Replies
4. UNIX for Dummies Questions & Answers
Hi,
I get the message NOTICE HTFS :No Space on dev hd (1/104), What does (1/104) mean? Is there any link, I can get material on understanding unix message log?
thanks. (4 Replies)
Discussion started by: scomrade
4 Replies
5. Solaris
Hi
What means Solaris 10 5/09 and Solaris 10 10/09, I mean the suffix 5/09 and 10/09 ?
thx for help. (1 Reply)
Discussion started by: presul
1 Replies
6. Shell Programming and Scripting
I'm writing a Korn script but am having trouble because the shell interprets the asterisk in this case. Can anyone tell me if there is a way to fix this so that grep takes in STDIN without the interpretation?
line="30 09 * * 1-4 /home/user01/bin/start"
echo "$line" | grep 'start' (16 Replies)
Discussion started by: sprucio
16 Replies
7. AIX
On my VIo I see the following for my disks:
$ lspath | grep hdisk6
Enabled hdisk6 fscsi0 200600a0b82193f7,4000000000000
Enabled hdisk6 fscsi0 200700a0b82193f7,4000000000000
Enabled hdisk6 fscsi2 200600a0b82193f8,4000000000000
Failed hdisk6 fscsi2 200700a0b82193f8,4000000000000
$ lspath |... (8 Replies)
Discussion started by: petervg
8 Replies
8. UNIX for Advanced & Expert Users
hi, anyone can help on this piece of truss output?
8094: 0.7028 write(4, 0x0043BE90, 236) = 236
8094: T S H \0\0\0EC020101\0\0\0\0\0\0\0\0\0 "02\0\0 303\0\0 I D
8094: \f %\0\0\0\0 2\0F67F\0\0\0\0 @06FFC99A ;
8094: L D6\0 303
8094: ... (6 Replies)
Discussion started by: ghostdog74
6 Replies
9. UNIX for Advanced & Expert Users
hi,
working on Solaris 10. need your help on ping behaviour that I encountered.
I ping from source to destination
-bash-3.2# ping -s -t 128 10.10.10.200
PING 10.10.10.200: 56 data bytes <===== stops here for 2 minutues before getting reply back
64 bytes from 10.10.10.200:... (9 Replies)
Discussion started by: ghostdog74
9 Replies
LEARN ABOUT DEBIAN
lav2yuv
lav2yuv(1) MJPEG tools manual lav2yuv(1)
NAME
lav2yuv - Convert a MJPEG file to raw yuv
SYNOPSIS
lav2yuv [options] lavfile1 [lavfile2 ... lavfileN]
DESCRIPTION
lav2yuv converts an MJPEG video sequence described by a sequence of MJPEG video files and/or edit lists pointing to such files into the
simple uncompressed planar 4:2:0 Y'CbCr format, as used by mpeg2enc(1) MPEG encoder and image processing filters like yuvscaler(1) or
yuv2dfilter(1) or yuvdenoise(1).
Output is to stdout so that by piping the output of lav2yuv into a suitable pipeline it is possible to process and then encode or play back
video recorded in any of the mjpegtools MJPEG container formats: AVI, quicktime or edit lists describing editted versions of video held in
such files.
Mixing different files with different video formats is currently not possible.
The -S -T -D options are used for scene detection which is used by linux video studio.
OPTIONS
lav2yuv accepts the following options:
-m Force mono-chrome
-c Conceal frames containing corrupt MJPEG data by repeating the preceeding good frame.
-S list.el
Output a scene list with scene detection
-T num
Set scene detection threshold to num (default: 4)
-D num
Width decimation to use for scene detection (default: 2)
-o num
Frame offset - skip num frames at the beginning. if num is negative all but the last num frames are skipped
-f num
Only num frames are written to stdout. 0 means that all frames are processed.
-A width:height
Set/override the sample aspect ratio (SAR) emitted in the output stream header. Currently, the SAR is only auto-detected for DV
files, and guessed otherwise.
-P width:height
Set the intended/approximate display aspect ratio (DAR) for the stream. This value is only used to guess the SAR when it cannot be
detected from the input stream. The default DAR is '4:3' (corresponding to a standard TV screen); another useful value is '16:9'
(corresponding to widescreen TV).
-C chroma
Set output chroma (default: '420jpeg'). Currently, '420jpeg', '420mpeg2', '420paldv', '422' are available.
-x Exchange fields. Useful if the field order was reversed during editing.
AUTHOR
This man page was originally written by Bernhard Praschinger.
If you have questions, remarks, problems or you just want to contact the developers, the main mailing list for the MJPEG-tools is:
mjpeg-users@lists.sourceforge.net
For more info, see our website at
http://mjpeg.sourceforge.net
SEE ALSO
mjpegtools(1), mpeg2enc(1), yuvscaler(1), yuv2lav(1), yuvdenoise(1), yuvplay(1)
MJPEG Linux Square 6 March 2002 lav2yuv(1)