Team Darth Vector
TEAM, use this for formatting. Wiki Editing Cheat Sheet
Members
Alistair Godwin
Giorgi Osadze
Leonel Jara
TBB Background
Containers Comparison
List of TBB containers:
concurrent_queue : Multiple threads may simultaneously push and pop elements from the queue.
concurrent_vector :
concurrent_hash_map : hash table that permits concurrent accesses.
quotes: Intel Threaded Building Blocks book. Highly concurrent containers are very important because Standard Template Library (STL) containers generally are not concurrency-friendly, and attempts to modify them concurrently can easily corrupt the containers.
Algorithms
parallel_for
parallel_scan
parallel_reduce
Threads
STL Background
Containers Comparison
pair,vector,list,slist,
Algorithms
TBB Threads
Lock Convoying Problem
What is a Lock?
Quick background on mutex/lock
Parallelism Problems in STL
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Lock Convoying in TBB
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Efficiency Comparison Parallel for and concurrent_vector
Concept: Fine-grained locking
Multiple threads operate on the container by locking only those portions they really need to lock.
Concept: Lock-free algorithms
Bits of knowledge:
STL interfaces are inherently not thread-safe.
Threading Building Blocks containers are not templated with an allocator argument.
Links
http://www.cs.northwestern.edu/~riesbeck/programming/c++/stl-summary.html
http://www.cplusplus.com/reference/stl/
https://www.inf.ed.ac.uk/teaching/courses/ppls/TBBtutorial.pdf
Coding Time Comparison for STL and TBB
Parallel Algorithms support
C++11 STL does not have much to offer for parallel algorithms natively unlike TBB
Though there are new algorithms for parallelism in the C++17 standard
More: http://www.bfilipek.com/2017/08/cpp17-details-parallel.html
Resource management
Overall partitioning, thread creation, and management is hidden in TBB
Thread Creation, terminating, and synchronizing is handled by TBB
The thread creation and overall resource for STL is managed by a combination of libraries;
-thread for creation and joining
-mutex for mutual exclusion and locks
-future for accessing results of asynchronous operations
