Please trim your quotes to contain only that part you are actually referring to.
On Thu, Jul 12, 2012 at 9:39 PM, Eliezer Croitoru <[email protected]> wrote: > but i was talking about a cache it over disk hit. > if say a disk hit = 19 requests the 19 is the 100% disk access. > so in my case if i get 950 requests that was suppose to have disk access and > only 19 had disk access i have more then 100% cache hit ratio. No, you don't. A cache hit ratio is always below 100%. You can reach 100% by preloading a cache but you can never have more than 100% because a cache hit ratio is calculated as requests served from cache divided by all accesses. You are contradicting yourself with what you write below: > to be exact i had about 10,800 queries and from them only 2,008 was served > from disk. > so it's a cache hit ratio of 80%, Correct. > so 100% disk access is 2,000 and 400% is compared to 100% disk access. You are calculating the reciprocal of the cache hit ratio and call it "cache hit ratio" as well. That does not make sense. I am unaware of a name for this metric but I believe it's better to stick to the standards so people understand what you mean. That's all language conventions and semantic is about. Cheers robert -- remember.guy do |as, often| as.you_can - without end http://blog.rubybestpractices.com/ -- You received this message because you are subscribed to the Google Groups ruby-talk-google group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at https://groups.google.com/d/forum/ruby-talk-google?hl=en
