Re: [Gems-users] How to identify cache hit rate in Ruby?

["Dave Z." <zhu_dave@xxxxxxxxx>]

Lei,

I'm trying to find out the cache hit/miss rate, but
haven't had any luck yet. I've modified
Sequencer::makeRequest to keep track of hits and
misses, but for some reason the number of hits and
misses tracked by the Sequencer is totally different
that the ones profiled by Ruby. Perhaps Ruby profiles
the hits/misses on conditions that are not tracked by
the Sequencer. I have no idea. So, you can try a
similar approach and see if it works for you.

Regards,

Dave


--- Lei Yang <lei.d.yang@xxxxxxxxx> wrote:

> Dear list,
> 
> I'm wondering whether Ruby provides such statistics
> like cache
> hit/miss rate? For example, in the following stats
> report from Ruby:
> 
> L1D_cache cache stats:
>  L1D_cache_total_misses: 29807
>  L1D_cache_total_demand_misses: 29807
>  L1D_cache_total_prefetches: 0
>  L1D_cache_total_sw_prefetches: 0
>  L1D_cache_total_hw_prefetches: 0
>  L1D_cache_misses_per_transaction: 29807
>  L1D_cache_misses_per_instruction: 0.000143247
>  L1D_cache_instructions_per_misses: 6980.94
> 
>  L1D_cache_request_type_LD:   16.0197%
>  L1D_cache_request_type_ST:   82.7557%
>  L1D_cache_request_type_ATOMIC:   1.22454%
> 
>  L1D_cache_access_mode_type_SupervisorMode:   6933  
>  23.2596%
>  L1D_cache_access_mode_type_UserMode:   22874   
> 76.7404%
>  L1D_cache_request_size: [binsize: log2 max: 64
> count: 29807 average:
> 4.90469 | standard deviation: 4.44371 | 0 642 88
> 23854 5077 0 0 146 ]
> 
> We know the total L1D cache misses, and the
> misses_per_instruction.
> But do we know the total number of cache acesses,
> and thus the
> hit/miss rate? Also, what does
> misses_per_transaction mean?
> 
> Thank you in advance!
> Lei
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