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Tag Archives: parallel
Verification Challenge 3: cbmc
The first and second verification challenges were directed to people working on verification tools, but this one is instead directed at developers. It turns out that there are a number of verification tools that have seen heavy use. For example, … Continue reading
Posted in Uncategorized
Tagged parallel, rcu, validation, verification, verification challenge
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Verification Challenge 2: RCU NO_HZ_FULL_SYSIDLE
I suppose that I might as well get the “But what about Verification Challenge 1?” question out of the way to start with. You will find Verification Challenge 1 here. Now, Verification Challenge 1 was about locating a known bug. … Continue reading
Posted in Uncategorized
Tagged parallel, promela, rcu, validation, verification, verification challenge
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Verification Challenge 2: RCU NO_HZ_FULL_SYSIDLE
I suppose that I might as well get the “But what about Verification Challenge 1?” question out of the way to start with. You will find Verification Challenge 1 here. Now, Verification Challenge 1 was about locating a known bug. … Continue reading
Posted in Uncategorized
Tagged parallel, promela, rcu, validation, verification, verification challenge
Comments Off on Verification Challenge 2: RCU NO_HZ_FULL_SYSIDLE
A practitioner at a formal-methods conference
I had the privilege of being asked to present on ordering, RCU, and validation at a joint meeting of the REORDER (Third International Workshop on Memory Consistency Models) and EC2 (7th International Workshop on Exploiting Concurrency Efficiently and Correctly) workshops. … Continue reading
Posted in Uncategorized
Tagged bugs, linux bugs, parallel, stupid rcu tricks, stupid smp tricks, workshop
Comments Off on A practitioner at a formal-methods conference
A practitioner at a formal-methods conference
I had the privilege of being asked to present on ordering, RCU, and validation at a joint meeting of the REORDER (Third International Workshop on Memory Consistency Models) and EC2 (7th International Workshop on Exploiting Concurrency Efficiently and Correctly) workshops. … Continue reading
Posted in Uncategorized
Tagged bugs, linux bugs, parallel, stupid rcu tricks, stupid smp tricks, workshop
Comments Off on A practitioner at a formal-methods conference
Stupid RCU Tricks: Bug Found by Refactored Tests
I recently refactored my rcutorture tests, getting that item off of my todo list after “only” three or four years. To my surprise, one (but only one) of the new rcutorture test scenarios failed, namely the one creatively named TREE08: … Continue reading
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Tagged linux, parallel, rcutorture, stupid rcu tricks
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HOTPAR 2013
I had the privilege of attending this year’s USENIX Workshop on Hot Topics in Parallelism (HOTPAR), which was as always an interesting gathering. One very positive change compared to the first HOTPAR in 2009 is that the participants seemed much … Continue reading
Posted in Uncategorized
Tagged is parallel programming hard, parallel, readings, stupid smp tricks
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Stupid RCU Tricks: Read-Side Ordering Constraints
Suppose that you have an initially empty RCU-protected hash table with per-bucket-locked updates. Suppose that one thread concurrently inserts items A and B in that order (but into different buckets) while a second thread concurrently looks up item A then item B—and while yet … Continue reading
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Tagged parallel, stupid rcu tricks
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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
Off to the races!
I was fortunate enough to be able to attend the first workshop on Relaxing Synchronization for Multicore and Manycore Scalability (also known as “RACES’12”), which drew concurrency researchers from across academia and industry. The topic was somewhat controversial, quoting from … Continue reading
Posted in Uncategorized
Tagged is parallel programming hard, parallel, readings, stupid smp tricks
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