[Darshan-users] Computation of CP_ACCESS[1-4]_ACCESS and other histogram counters

[Matthieu Dorier]

Hi, 

Simple questions out of curiosity: 
I see some counters like, for instance, CP_ACCESS[1-4]_ACCESS (described as "4 most common access sizes"). Does it mean that for each file accessed, Darshan will keep in memory a full histogram of all the access sizes until the end of the program, to be able to get the most frequent ones when writing the log file? If so, isn't it memory-consuming in case of a large number of accesses with different sizes? Besides, why 4? Is it motivated by some analysis that showed 4 to be good enough for most applications? 

Thanks! 

Matthieu Dorier 
PhD student at ENS Rennes 
http://people.irisa.fr/Matthieu.Dorier 
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