On Mon, May 18, 2020 at 02:12:42PM -0500, Paul A. Clarke wrote: > I'm curious how hard it would be to define metrics using other metrics, > in the metrics definition files. > > Currently, to my understanding, every metric definition must be an > expresssion based solely on arithmetic combinations of hardware events. > > Some metrics are hierarchical in nature such that a higher-level metric > can be defined as an arithmetic expression of two other metrics, e.g. > > cache_miss_cycles_per_instruction = > data_cache_miss_cycles_per_instruction + > instruction_cache_miss_cycles_per_instruction > > This would need to be defined something like: > dcache_miss_cpi = "dcache_miss_cycles / instructions" > icache_miss_cpi = "icache_miss_cycles / instructions" > cache_miss_cpi = "(dcache_miss_cycles + icache_miss_cycles) / instructions" > > Could the latter definition be simplified to: > cache_miss_cpi = "dcache_miss_cpi + icache_miss_cpi" > > With multi-level caches and NUMA hierarchies, some of these higher-level > metrics can involve a lot of hardware events. > > Given the recent activity in this area, I'm curious if this has been > considered and already on a wish/to-do list, or found onerous. hi, actually we were discussing this with Ian and Stephane and I plan on checking on that.. should be doable, I'll keep you in the loop jirka > > Regards, > Paul Clarke >
