09-29-2015
How about vmstat 1 1 instead of piping through tail -1?
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1. UNIX for Dummies Questions & Answers
I have MATLAB INSTALLED IN MY SUN MACHINE >>
WHENEVER I USE IT THE CPU USAGE SHOWS ABT 90%
Seeing the vmstat shows that system calls and context switch counters reach a very high value .
What are these counters ( Man pages do not give much info on that) ....
The only thing i can make out that... (1 Reply)
Discussion started by: DPAI
1 Replies
2. UNIX for Dummies Questions & Answers
Hi,
In the unix command, "vmstat" we get information on Page memory.
what does the "mf" - "minor fault" is?
Regards,
Anent (3 Replies)
Discussion started by: anent
3 Replies
3. UNIX for Dummies Questions & Answers
When I exeute vmstat (e.g. vmstat 30 2),
in some machines I get some wierd result as the first line.
like: -117% or 208% for CPU idle percentage.
But the second line is alright.
Could someone explain this please.
Thanks !
Chaadana (4 Replies)
Discussion started by: chaandana
4 Replies
4. UNIX for Advanced & Expert Users
Hi,
what does mean the free colomne in out put of vmstat ? is it free espace of physical memory or of swap space on hard disk ?
Thank you (4 Replies)
Discussion started by: big123456
4 Replies
5. UNIX for Dummies Questions & Answers
Hi
I wanted to collect data by using vmstat -I 60 >xxxx.txt & using my own account
It was stopped by it self after 2 hours try again same result
We want to collect day date by succession how to collect data using vmstat for day
Thank you (2 Replies)
Discussion started by: Syed_45
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6. Solaris
This is something nowbody around me can explain:
vmstat (-S 5) shows a huge number of PI but when I try to monitor it in parallel with iostat - there is no IO activity to be seen that would correspond to this.
I have 16G RAM and 32G swap file.
I'll really appreciate if somebody can explain it.... (9 Replies)
Discussion started by: dkvent
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7. Linux
Hi everyone,
I need to see some VM manager performance/behavior information on some Linux boxes regarding pages scanned/activation of the paging algorithm in order to get an idea if a given server needs more memory and is actually paging. In Aix servers, by using the vmstat cmd you... (1 Reply)
Discussion started by: jcpetela
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8. Shell Programming and Scripting
Hi
I need to write a script to display VMSTAT every 5 seconds and I just need the memory columns - swap free re and just the numbers and the headers arent required.
For example
bash-3.00$ vmstat 5| awk '{print $4" "$5" "$6}'
disk faults cpu ------ This header isnt required
swap... (3 Replies)
Discussion started by: kapilk
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9. AIX
I need some guidance on the differences in observations, not sure how significantly different are they.
Also, It would be nice to hear on the values and what the obvious tuning for performance missing.
Observation 1
ending vmstat -v 3948544 memory pages
ending vmstat -v ... (1 Reply)
Discussion started by: Snipper
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10. Solaris
I'm trying to parse vmstat output with this:
vmstat | nawk '/0/{printf "%s\ \n", $5}'
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why ? (3 Replies)
Discussion started by: orange47
3 Replies
LEARN ABOUT DEBIAN
bup-margin
bup-margin(1) General Commands Manual bup-margin(1)
NAME
bup-margin - figure out your deduplication safety margin
SYNOPSIS
bup margin [options...]
DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two
entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.
For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit
hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
its first 46 bits.
The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits,
that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
with far fewer objects.
If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if
you're getting dangerously close to 160 bits.
OPTIONS
--predict
Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
from the guess. This is potentially useful for tuning an interpolation search algorithm.
--ignore-midx
don't use .midx files, use only .idx files. This is only really useful when used with --predict.
EXAMPLE
$ bup margin
Reading indexes: 100.00% (1612581/1612581), done.
40
40 matching prefix bits
1.94 bits per doubling
120 bits (61.86 doublings) remaining
4.19338e+18 times larger is possible
Everyone on earth could have 625878182 data sets
like yours, all in one repository, and we would
expect 1 object collision.
$ bup margin --predict
PackIdxList: using 1 index.
Reading indexes: 100.00% (1612581/1612581), done.
915 of 1612581 (0.057%)
SEE ALSO
bup-midx(1), bup-save(1)
BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown- bup-margin(1)