09-03-2013
CPU load in video decoding using SAR
Hi, I'm John_giova and I'm new in this Forum. Sorry my english, it's not my first language.
So, I'm trying to check the CPU utlization during the video encoding and decoding (making a comparison between SW and HW ) using the SAR tool. According to a past thread I saw as CPU utilization I should have to consider %user+%nice+%system.
The questions are 2:
The first, more important, is: is the video co-decoding a user activity, and I need to consider just %user+%nice as CPU load or I have to consider also %system?
Second: why when I do the SW encoding almost the total load is on %nice column(few in user) and when I do HW encoding and both SW and HW decoding the main utilization CPU is in the %user column and the %nice column is totally zero??
I hope I have been clear enough, I'm not really pacticed with this.
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less(3pm) Perl Programmers Reference Guide less(3pm)
NAME
less - perl pragma to request less of something
SYNOPSIS
use less 'CPU';
DESCRIPTION
This is a user-pragma. If you're very lucky some code you're using will know that you asked for less CPU usage or ram or fat or... we just
can't know. Consult your documentation on everything you're currently using.
For general suggestions, try requesting "CPU" or "memory".
use less 'memory';
use less 'CPU';
use less 'fat';
If you ask for nothing in particular, you'll be asking for "less 'please'".
use less 'please';
FOR MODULE AUTHORS
less has been in the core as a "joke" module for ages now and it hasn't had any real way to communicating any information to anything.
Thanks to Nicholas Clark we have user pragmas (see perlpragma) and now "less" can do something.
You can probably expect your users to be able to guess that they can request less CPU or memory or just "less" overall.
If the user didn't specify anything, it's interpreted as having used the "please" tag. It's up to you to make this useful.
# equivalent
use less;
use less 'please';
"BOOLEAN = less->of( FEATURE )"
The class method "less->of( NAME )" returns a boolean to tell you whether your user requested less of something.
if ( less->of( 'CPU' ) ) {
...
}
elsif ( less->of( 'memory' ) ) {
}
"FEATURES = less->of()"
If you don't ask for any feature, you get the list of features that the user requested you to be nice to. This has the nice side effect
that if you don't respect anything in particular then you can just ask for it and use it like a boolean.
if ( less->of ) {
...
}
else {
...
}
CAVEATS
This probably does nothing.
This works only on 5.10+
At least it's backwards compatible in not doing much.
perl v5.12.1 2010-04-26 less(3pm)