Implement multiplexing support for using more events than physical counters in groups

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Problem:

The physical counters are not enough to measure all interesting metrics in one 
run. Some architectures even have not enough counter to compute a single metric 
in one run.

Solution:

Implement multiplexing which allows to use virtual counters. In a multiplexing 
groups physical counters are mapped in multiple event sets on a unlimited 
number of virtual counters. The virtual counters can be used in computing 
derived metrics.

Tasks:

Extend group syntax to enable multiplexing groups
Create a module managing the multiplexing of multiple event sets
Plan timing issues (accumulate or extrapolate)

Original issue reported on code.google.com by jan.trei...@gmail.com on 3 Dec 2012 at 7:19

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is there any update (beta version?) on the multiplexing implementation? that 
feature would be very useful!

Original comment by vpetrucci on 19 Apr 2013 at 1:27

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Original comment by jan.trei...@gmail.com on 8 May 2014 at 11:03

• Added labels: Priority-Medium, Release-4.0
• Removed labels: Priority-High