[Freevo-tracker] [ freevo-Bugs-2193966 ] reduce CPU footprint (patches)

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Bugs item #2193966, was opened at 2008-10-25 13:22
Message generated for change (Comment added) made by duncanwebb
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Category: core
>Group: 1.x svn (rel-1)
>Status: Pending
>Resolution: Accepted
Priority: 5
Private: No
Submitted By: A C G Mennucc (mennucc)
Assigned to: Nobody/Anonymous (nobody)
Summary: reduce CPU footprint (patches)

Initial Comment:
hi, 

I have a dedicated freevo box , with Athlon XP 1800+ CPU. I have noted that freevo  uses a bit more CPU than would be desirable; I did a few changes that seem to work, and I propose that you may adopt them in SVN. Let's see them one by one.

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 When the box is totally idle, the main freevo process still uses around 6% of CPU time. It seems that most of this time is in polling.
I propose to change the default polling time, that now is 0.01; using
POLL_TIME             = 0.1 
with this change the CPU usage goes down to 2%. 
IMHO this change in the polling does not render freevo less responsive (and in particular I mean, when using the remote control). Comments?

--
 I also use the idlebar.encoding plugin. When the encoding server is reencoding, the various freevo processes use up to 15% of CPU, leaving only 85% to the mencoder process. This is a pity , since it means that the reencoding will last quite longer . I attach two patches, one that makes the parsing of mencoder output a bit faster, and one that increases the polling time for the idlebar.encoding. 

---
With the above 3 patches, the CPU usage of freevo when reencoding does not exceed ~6% (including all servers) and the mencoder runs at ~ 93%

a.



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>Comment By: Duncan Webb (duncanwebb)
Date: 2008-10-29 17:57

Message:
Hi Andrea,

I think I'll leave the POLL_TIME alone, the reason is: it is high for some
of the other modules that need a high poll time.

The idlebar plug-in should change its polling rate depending on what it is
doing. Having said that it should be rewritten to use kaa.Timer which will
reduce the load, hopefully significantly.

The encodingcore-faster-mencoder-parsing.diff has been applied to svn at
r11126

Many thanks for this.



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