Hyper-Theading
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Hyper-threading technology allows a single processor to appear and function as multiple processors. It was first implemented in 2002 in Intel Pentium 4 Xeon processors. Hyper-threading works by dividing processor workload into threads that can be executed concurrently on different processor execution units. This makes more efficient use of processor resources and improves performance on multi-threaded software. While it increases throughput, shared processor resources between threads can also lead to conflicts that result in reduced performance in some cases.
Hyper-Theading
- 1. KAMARAJ COLLEGE OF ENGINEERING AND TECHNOLOGY CS8491-Computer Architecture Done By: TEAM NUMBER:T13 Head: R.Shenbaga Rani
- 2. •Hyper-Threading technology makes a single processor appear as two logical processors. •It was first implemented in the Prestonia version of the Pentium* 4 Xeon Processor on 02/15/02 Intel Multithreading I
- 3. CONTENTS Hyper-Threading Technology Implementation Architecture and its Application Pros and Cons
- 4. INTRODUCTION Ground technology from the intel that allows processor to work more efficiently Technology enables the processor to execute series of informations at a time Improved Onboard Part 1
- 5. •Hyper multithreading is a technology developed by Intel corporation. •It is commonly referred as-”HT Technology”. •Technique which enables single CPU as like Multiple CPU’S. •Enables different parts of CPU to work on different task concurrently. • It is a feature of Intel's IA-32(short for "Intel Architecture, 32-bit", sometimes also called i386) processor architecture What is Hyper-Threading?
- 6. •Hyper threading technology takes advantages of multithreading capability. •The processor can work on two sets of tasks simultaneously •Processor use the resources otherwise would sit idle and done more work in same amount time •Divide the workload into processes and threads •Execute the threads on different processors. How Hyper-Threading Works?
- 8. Partitio ned Implem enting Replicat ed KEY WORDS Shared REPLICATED:- logic,instruction pointer,ITLB,return stack predictor. PARTIONED:-Re-order buffers,load/store buffer,various queues-scheduling queue,uop queue. SHARED :-Caches,Trace cache,L1,L2,L3,Micro-Architectural registers,Execution Units. Implementing of Hyper-Threading:
- 9. REPLICATED RESOURCE: •Necessary in order to maintain two fully independent contexts logical processor. •The most obvious of these is the instruction pointer(IP),which is the pointer that helps the processor keep track of its place in the instruction stream by pointing to the next instruction to be fetched. •In order to run more than one process on the CPU,you need as many IPs as there are instruction streams keep track of.
- 10. •Dynamically partitoned queue •In a scheduling queue with 12 entries, instead of assigning entries 0 through 5 to logical processor 0 and entries 6 through 11 to logical processor 1,the queue allows any logical processor to use any entry but it places a limit on the number of entries that any one logical processor can use. So in the case of 12-entry scheduling queue,each logical processor can use no more than six of the entries. •Statistically partioned queue. •Each queue is split in half. •Its resources solely dedicated to use of one logical processor. Partitioned resourses:
- 11. Shared Resourses: •Shared resources are the heart of hyper-multi threading, which they makes the techniquw worthwhile. •Hyper threading’s greatest strength is shared resources, but it may also turn to its weakness. •A class of shred resources consists of the execution units: The integer units,floating-point units and load-store unit. •Many resources are shared between the logical processors. •The more efficient Hyper-Threading can be the maximum amount of power computing.
- 12. Architecture: Processor Without Hyper-Threading Processor with Hyper-Threading Part 3
- 13. ARCHITECTURE: a5 a5 a5 a5 MULTI- PROCESSOR RESOURCES PROCESSOR EXECUTION RESOURCES PROCESSOR EXECUTION RESOURCES MUTIPROCESSOR HYPER-THREADING
- 14. APPLICATION: The intel Xenon processor with Hyper –threading is well suited for servers and high –end scientific computing workstation, as well as demanding applications such as graphics, multimedia and gaming Business Benefits
- 15. Advantages: •No performance loss if only o n e t h r e a d I a c t i v e . •Increased performance with m u l t i p l e - t h r e a d s •Increased number of users a platform can support •Improved throughput, because tasks run on separate methods •Improved reaction ans response time •Improved number of transaction that can be executed
- 16. Disadvantages: No serial execution non-deterministic extra design increased overhead Shared resources conflict cons
- 17. Conclusion •Intel Xeon Hypertext – threading is definitely having a positive impact on linux kernel and multithreaded applications •Today with Hyper threading technology, processor level threading can be utilized which offers more efficient use of processor resources for greater parallelism and improved performance on today’s multi-threaded software. Part 4
- 18. References: https://www.intel.in/content/www/in/en/homepage.html ?cid=sem43700039714976879&intel_term=%2Bintel+%2B technology&campaign_name=CONS+IN+Intel+B https://www.seminarsonly.com/IT/Hyper%2 0 T h r e a d i n g % 2 0 t e c h n o l o g y. p h p PPTsit.iitkgp.ernet.in › research › pres7 Hyperthreading https://www.slideshare.net/mobile/deepakmarndi/hyper- threading-technology-10792448