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en:uhsdr_dev:power [17.02.2018 07:04] (current)
df9ts created
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 +Thanks Danilo for the information about enabling semihosting. ​ It seems that is a non-starter. ​ Same goes for the profiling code.  The reason is that for power profiling purposes, I am not interested in the execution time, but instead in the power consumed by a given scope of code being executed, and I need to match up entry/exit of multiple code blocks using timestamps that I later align to my power monitor'​s captured measurements. ​ This won't be possible with a screen indicator, and I suspect enabling semihosting would massively interfere with "​normal"​ power consumption measurements if it is slowing down the processor all the time.\\
 +\\
 +Maybe this will have to wait until we have ability to write data to a file for retrieval later. ​ It'd be a simple annotation printed out, just "​Timestamp XXXXXXXX enter function foo::​bar",​ "​Timestamp XXXXXXXX exit function foo::​bar",​ or even just a unique ID and a timestamp, or unique ID and system clock, whatever is fast and could be converted back into an approximate timestamp log later. ​ Flag only entry/exit for the highest level routines to start, find the ones that unexpectedly eat a lot of power compared to the value they provide. ​ Start annotating further and further down into their functions until we start turning up sections that eat more power than we would expect ("​expect"​ is arguable and an art of sorts).\\
 +\\
 +I would most likely use Google'​s GitHub project battery-historian,​ which is trivial to repurpose for non-Android profiling and accepts Monsoon logs.  It makes hunting for power hogs easy.  Check out the first screenshot on the project page.\\
 +[[https://​github.com/​google/​battery-historian|https://​github.com/​google/​battery-historian]]
 +