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added some thoughts about scheduler doing a little profiling on elements

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Original commit message from CVS:
added some thoughts about scheduler doing a little profiling on elements
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Stefan Kost 2005-02-16 17:19:06 +00:00
parent 25b9d5e292
commit f38a2c4ea7
1 changed files with 26 additions and 0 deletions
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docs/random/ensonic/profiling.txt Normal file
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$Id$
Could schedulers do a little profiling?
* scheduler keeps a list of usecs the process function of each element was
running
* process functions are: loop, chain, get
* scheduler keeps a sum of all times
* each gst-element has a profile_percentage field
* when going to play
* scheduler sets sum and all usecs in the list to 0
* when handling an element
* remember old usecs t_old
* take time t1
* call elements processing function
* take time t2
* t_new=t2-t1
* sum+=(t_new-t_old)
* profile_percentage=t_new/sum;
* should the percentage be averaged?
* profile_percentage=(profile_percentage+(t_new/sum))/2.0;
* the profile_percentage shows how much CPU time the element uses in relation
to the whole pipeline