[Fw_Os_Forum] Handle Data Base Statistics

[Aaron.Pop at congatec.com]

Hi Valerij,

I can only answer based on the systems that I have experienced, but I 
would encourage you to write whatever application you are creating to 
handle any number of possible handles and to not create an upper limit or 
a lower limit because of the variety of UEFI implementations. 


>>How many handles are installed on a typical system?
anywhere between 1 and a million

>>What the greatest (smallest) number of handles has been encountered on 
UEFI systems?
the max I have seen is 500+

>>How many protocols are installed on a typical system?
implementation specific, each system, and its feature set cause a wide 
variation in the number of different protocols. 

>>What the greatest (smallest) number of protocols has been encountered on 
UEFI systems?
no upper limit.  The more devices in the system, the more devices attached 
to the system (SATA drives, USB drives, PCI cards, etc) will cause an 
increase in the number of handles and the number of protocols.

>>How many, in average, protocols is installed on a handle?
>>What the greatest number of protocols per handle has been encountered on 
a typical system?
too many possibilities, and too many variations in implementation to give 
you a baseline. 


>>How many agents, in average, is consuming a particular protocol 
interface on a handle?
What the greatest number of agents per protocol per handle encountered?
There are too many variations to really give you answer here.  Generally 
it depends on the drivers that are implemented in the system. 


>>I am asking this not of the empty interest of course, those numbers 
would be very useful for me in ensuring I am chosing right data 
organization of my UEFI implemetation, which I'm working on. :^)

To give you a general answer, I would say somewhere between 50 handles to 
1000 handles in a system, depending on segment (embedded systems having 
less handles, and server systems having more)






From:   valerij zaporogeci <vlrzprgts at gmail.com>
To:     fw_os_forum at mailman.uefi.org
Date:   05/15/2016 12:59 PM
Subject:        [Fw_Os_Forum] Handle Data Base Statistics
Sent by:        fw_os_forum-bounces at mailman.uefi.org



Hi, all
I have few question. Those who might know this, wouldn't you be so
nice to share your knowledge? :^) The questions:
How many handles are installed on a typical system?
What the greatest (smallest) number of handles has been encountered on
UEFI systems?
How many protocols are installed on a typical system?
What the greatest (smallest) number of protocols has been encountered
on UEFI systems?
How many, in average, protocols is installed on a handle?
What the greatest number of protocols per handle has been encountered
on a typical system?
How many agents, in average, is consuming a particular protocol
interface on a handle?
What the greatest number of agents per protocol per handle encountered?
I am asking this not of the empty interest of course, those numbers
would be very useful for me in ensuring I am chosing right data
organization of my UEFI implemetation, which I'm working on. :^)
Thank you.
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