The document discusses hyper-threading (HT) technology, which enables a single processor to appear and function as multiple logical processors by duplicating the architectural state while sharing execution resources. HT allows two threads to run simultaneously, increasing processor efficiency. The main advantages are a 5% increase in die area size while avoiding performance loss with single threads and improving performance with multiple threads. Potential disadvantages include non-deterministic thread overhead and shared resource conflicts.

1. SHASHI KUMAR SHAW
2K13E25

2. CONTENTS
 Introduction
 HT Architecture
 Working principle
 Advantages & Disadvantages

3. INTRODUCTION
“HT Technology”, enables the processor to
execute two threads or sets of instructions
at the same time. Since hyper-threading
allows two streams to be executed in parallel
it is almost like having two separate processor
working together.

4. Hyper-Threading
Architecture
 First used in Intel Xeon MP processor
 Makes a single physical processor appear as
multiple logical processors.
 Each logical processor has a copy of architecture
state.
 Logical processors share a single set of physical
execution resources

5.  Hyper-Threading technology is a form of
simultaneous multi-threading technology
(SMT), where multiple threads of software
applications can be run simultaneously on
one processor.
 This is achieved by duplicating the
architectural state on each processor, while
sharing one set of processor execution
resources.

7. Advantages
 Extra architecture only adds about 5%
to the total die area.
 No performance loss if only one
thread is active. Increased
performance with multiple threads
 Hyper-Threading Technology is
designed to increase the ability to use
a processor efficiently
 Increase thread-level parallelism

8. Disadvantages
 To take advantage of hyper-threading
performance, serial execution can not
be used.
 Threads are non-deterministic and involve
extra design
 Threads have increased overhead
 Shared resource conflicts

9. Business Benefits of Hyper-Threading
Technology
 Higher transaction rates for e-businesses
 Improved reaction and response times for
end-users and customers.
 Increased number of users that a server
system can support
 Handle increased server workloads
 Compatibility with existing server
applications and operating systems

10. Conclusion
 Intel’s Hyper-Threading Technology
brings the concept of simultaneous
multi-threading to the Intel Architecture
 Hyper-Threading Technology shows
performance gains of up to 30% on
common server application benchmarks
for this technology.

12. THANK YOU