-
Archives
- May 2022
- December 2021
- November 2021
- October 2021
- September 2021
- July 2021
- May 2021
- April 2021
- March 2021
- December 2020
- October 2020
- September 2020
- July 2020
- June 2020
- March 2020
- January 2020
- December 2019
- October 2019
- April 2019
- March 2019
- January 2019
- December 2018
- November 2018
- September 2018
- August 2018
- July 2018
- June 2018
- May 2018
- April 2018
- February 2018
- December 2017
- November 2017
- October 2017
- August 2017
- July 2017
- June 2017
- April 2017
- February 2017
- January 2017
- November 2016
- September 2016
- August 2016
- July 2016
- June 2016
- May 2016
- April 2016
- March 2016
- February 2016
- October 2015
- September 2015
- June 2015
- May 2015
- April 2015
- March 2015
- February 2015
- January 2015
- November 2014
- October 2014
- August 2014
- June 2014
- March 2014
- January 2014
- October 2013
- August 2013
- July 2013
- June 2013
- April 2013
- February 2013
- January 2013
- November 2012
- October 2012
- September 2012
- August 2012
- July 2012
- June 2012
- May 2012
- March 2012
- February 2012
- January 2012
- December 2011
- November 2011
- October 2011
- September 2011
- August 2011
- July 2011
- June 2011
- May 2011
- April 2011
- March 2011
- February 2011
- January 2011
- December 2010
- November 2010
- October 2010
- September 2010
- August 2010
- July 2010
- June 2010
- May 2010
- April 2010
- March 2010
- February 2010
- January 2010
- December 2009
- November 2009
- October 2009
- September 2009
- August 2009
- July 2009
- June 2009
- May 2009
- April 2009
- March 2009
- February 2009
-
Meta
Tag Archives: performance
Stupid RCU Tricks: How Read-Intensive is The Kernel’s Use of RCU?
RCU is a specialized synchronization mechanism, and is typically used where there are far more readers (rcu_read_lock(), rcu_read_unlock(), rcu_dereference(), and so on) than there are updaters (synchronize_rcu(), call_rcu(), rcu_assign_pointer(), and so on). But does the Linux kernel really make heavier … Continue reading
Posted in Uncategorized
Tagged linux, performance, stupid rcu tricks
Comments Off on Stupid RCU Tricks: How Read-Intensive is The Kernel’s Use of RCU?
RCU and Crowds
“A Read-Copy Update based parallel server for distributed crowd simulations” (paywalled) recently appeared in Journal of Supercomputing. Vigueras et al. apply RCU to crowd simulation (as you might guess from the title), which combines throughput (“faster is better”) and response-time … Continue reading
Validation: Distinguishing Small Samples
Suppose that we have two small samples of performance measurements, perhaps as follows: Measurement # Sample 1 Sample 2 1 84.5 90.9 2 91.0 88.2 3 87.6 89.7 4 89.5 89.9 5 72.4 90.4 Each sample’s five measurements are in … Continue reading
Validation: How Much is an Order of Magnitude Worth?
Suppose that one implementation of a program takes ten seconds to complete, while another implementation takes only one second to complete. What can we conclude about the relative performance of the two programs?
Posted in Uncategorized
Tagged performance, validation
Comments Off on Validation: How Much is an Order of Magnitude Worth?
Parallel Programming: The Summing Up
So what can we say about parallel programming? The many answers to this question fills many a book, but the following points seem especially worth emphasizing: Parallelism is universal and intuitive. It is programming, whether parallel or not, that is … Continue reading
Posted in Uncategorized
Tagged is parallel programming hard, locking, parallel, performance
4 Comments
Parallel Programming: The Good, The Fad, And The Ugly
Back in the Heeding History posting in this series, I argued that the solutions put forward to deal with the Great Software Crisis of the 1970s and 1980s could be grouped into the good, the fad, and the ugly. Is … Continue reading
Posted in Uncategorized
Tagged is parallel programming hard, locking, parallel, performance
5 Comments
Parallel Programming: Administrators as Architects
Although IT professionals should take care to avoid engineering envy, it is often useful to learn from the experiences of other engineering disciplines. In this posting, I will compare and contrast construction of a building to implementation of a large … Continue reading
Posted in Uncategorized
Tagged is parallel programming hard, locking, parallel, performance
Comments Off on Parallel Programming: Administrators as Architects
Parallel Programming: Selective Struggling
An Eminent Reader privately indicated some distaste for the non-technical nature of recent parallel programming posts. Given that many of the obstacles to successful development of parallel software are non-technical, there will be future non-technical posts, but there is no … Continue reading
Posted in Uncategorized
Tagged is parallel programming hard, locking, parallel, performance
2 Comments
Parallel Programming: Questionable Quality Assurance
An earlier post noted that parallel programming suffers more potential failures in planning than does sequential programming due to the usual suspects: deadlocks, memory misordering, race conditions, and performance/scalability issues. This should lead us to suspect that parallel programs might … Continue reading
Posted in Uncategorized
Tagged is parallel programming hard, locking, parallel, performance
Comments Off on Parallel Programming: Questionable Quality Assurance
Parallel Programming: Terrible Tooling
In a previous life, I worked on a UNIX kernel on a team of a few tens of developers. This smallish team size resulted in a very smallish set of development tools. To see why, imagine a tool that required … Continue reading
Posted in Uncategorized
Tagged is parallel programming hard, locking, parallel, performance
6 Comments
paulmckrcu 
You must be logged in to post a comment.