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SIMD Compression and the Intersection of Sorted Integers

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Sorted lists of integers are commonly used in inverted indexes and database systems. They are often compressed in memory. We can use the SIMD instructions available in common processors to boost the speed of integer compression schemes. Our S4-BP128-D4 scheme uses as little as 0.7 CPU cycles per decoded integer while still providing state-of-the-art compression. However, if the subsequent processing of the integers is slow, the effort spent on optimizing decoding speed can be wasted. To show that it does not have to be so, we (1) vectorize and optimize the intersection of posting lists; (2) introduce the SIMD Galloping algorithm. We exploit the fact that one SIMD instruction can compare 4 pairs of integers at once. We experiment with two TREC text collections, GOV2 and ClueWeb09 (Category B), using logs from the TREC million-query track. We show that using only the SIMD instructions ubiquitous in all modern CPUs, our techniques for conjunctive queries can double the speed of a state-of-the-art approach.

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  • URGENT EFFECTIVE LOVE-SPELL TO GET YOUR EX HUSBAND/WIFE BACK FAST CONTACT: MERCYFULLSOLUTIONHOME@GMAIL.COM , HE'S CERTAINLY THE BEST SPELL CASTER ONLINE, AND HIS RESULT IS 100% GUARANTEE . Thank LORD JUMA for bringing my Husband back to me. My Husband told me it was over and walk away without any reasons, I was confuse and didn't know what to do. I was desperate, I want him back, I went over the internet looking for ways to get my Husband back. I read about many different ways of how to but LORD JUMA caught my attention, I immediately contacted him and explained my problem to him. It was amazing and surprising that 11hrs after the spell was cast, my Husband called me and was begging me to forgive him and accept him back, Couldn't believe that it was happening some time later he came to my house and fell on his knees asking me to take him back which did. I am testifying on this forum just to let people know that LORD JUMA is real and genuine. don't hesitate to try him out. thank you LORD JUMA your such a kind man.. Contact him now if you need your Husband back or your husband moved to another woman, do not cry anymore .. Here’s his contact: Email him at: mercyfullsolutionhome@yahoo.com or mercyfullsolutionhome@gmail.com , you can also call him or add him on Whats-app: +1 (859)-203-2241 , you can also visit his website: http://mercyfullsolutionhome.blogspot.com/ KIMBERLY PORCH,N Y,USA.
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