Intel thread building blocks

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This document discusses Intel Thread Building Blocks (TBB), which provides solutions for enabling parallelism in C++ applications. It enables parallelism through generic parallel algorithms like parallel_for and parallel_reduce. It includes synchronization primitives like mutexes and atomic operations for thread safety. It also describes concurrent containers that offer high concurrency through fine-grained locking and lock-free techniques. The TBB task scheduler provides features like work stealing to balance load across threads. TBB also includes memory allocators for scalability and avoiding false sharing.

Intel Thread Building Blocks
By
SHERIN JOSEPHIN B
11MSE0195

Introduction
• solution for enabling parallelism in C++
applications and libraries
• Advantages:
1) Make parallel performance
2) Scalability

Generic Parallel Algorithms
• parallel_for, parallel_for_each
• parallel_reduce
• parallel_scan
• parallel_pipeline
• parallel_do
• parallel_sort
• parallel_invoke

Synchronisation Primitives
Mutual exclusion: implemented by mutex and
locks
Atomic operation: No dead locks, Faster

Mutual exclusion
• Mutex is a object on which thread can acquire
lock
Mutex Flavours:
1) Scalable
2)Fair
3)Recursive
4)Yield or Block
Mutex Behaviours:
1) spin_mutex
2) queuing_mutex
3) spin_rw_mutex and
queuing_rw_mutex
4) speculative_spin_mutex,
speculative_spin_rw_mutex
5) mutex and recursive_mutex
6) null_mutex and
null_rw_mutex

Atomic operations
• Class atomic<T> : implementation in c++ style
• Usage: For thread safe reference counting
• 5 Fundamental operation
1. =x
2. x=
3. X.fetch_and_store(y)
4. x.fetch_and_add(y)
5. x.compare_and_swap(y,z)

Concurrent container
• Container by Intel TBB offers high level of
concurrency by
1. Fine-grained locking
2. Lock-free technique
• concurrent_queue
• concurrent_hash_map
• concurrent_vector

Task scheduler
Over subscription
Fair scheduling
High overload
Load imbalance
Scalability
One TBB thread per hardware thread
Non pre emptive unfair scheduling
Programmer specific task, not thread
Work stealing balance load
Specify task, how to create them, not threads

Memory Allocation
Scalability: scalable_allocator<T>
False sharing:
cache_aligned_allocator<T>

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