Randomly flip the bits in the bucket index. Writing the bucket index as a binary number, a small change to the key should Should change the bucket index in an apparently random way. If it is to look random, this means that any change to a key, even a small one, Simple uniform hashing assumption - that the hash function should look random. Recall that hash tables work well when the hash function satisfies the While hash tables are extremely effective when used well, all too often poor hash functions are used We want our hash function to use all of the information in the key. Length would be a very poor function, as would a hash function that used only If we're mapping names to phone numbers, then hashing each name to its A lot of obvious hash function choices are bad. Hash function, or make it difficult to provide a good hash function.Ĭlearly, a bad hash function can destroy our attempts at a constant Hash table abstractions do not adequately specify what is required of the Generators, invalidating the simple uniform hashing assumption. Clients choose poor hash functions that do not act like random number.Tables often falls far short of achievable performance. Unfortunately, they are also one of the most misused. Hash tables are one of the most useful data structures ever invented. We really can’t wait for you to try the resource calculator, so take it for a spin here and let us know what you think on the Ubiquiti Community forum.Lecture 21: Hash functions CS 312 Lecture 21 We’re very proud of this new innovation because it’s directly tied to our greatest pursuit: delivering the best system performance and user experience possible. Simplifying IT isn’t just about making networking technology more accessible and intuitive it’s about giving users a deeper understanding of how their system works and what’s needed to support it. Take a look at the calculator in action in our April edition of Ubiquiti Insider: After selecting a console and the applications it will run, you have a wealth of customization options to help you specify how many devices you’re connecting, how they will function, and whether or not they will have advanced configurations.Īs you make your adjustments, you’ll see how each console’s CPU and memory are impacted, helping you determine whether you’ve chosen the right model or you require one with higher specs. Our top priority is ensuring that every user can fully capture each component of their system so they know exactly what console is right for them. Granularity is the name of the game with our new calculator. With that in mind, we’re very excited to introduce the UniFi OS Console Resource Calculator : a brand-new modal that not only provides console-specific processing and memory caps with a single click, but gives dynamic approximations of how well each console can support various deployment types. Once you’ve finalized your deployment, then comes the all-important follow-up question:ĭo I have what I need to run all of this?
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That means you have myriad options when it comes to choosing your ideal devices, applications, and functionality, so we strongly recommend taking your time during the planning process. The UniFi product suite is vast, cohesive, and designed to be highly scalable so you can build and support networks of any size. Check out our brief video overview to learn more. We have you covered there with our Design Center, the interactive visualization tool that allows you to map out a custom network uniquely suited for your location.
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The first is whether or not your equipment can be seamlessly integrated into your space.
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There are two important questions to consider as you build your dream system and determine how to optimize its performance. Your UniFi deployment is only as good as the planning behind it.