Comments on: Thoughts on Parallelism http://enfranchisedmind.com/blog/posts/thoughts-on-parallelism/ programming, politics, & other religious issues Wed, 08 Feb 2012 14:16:00 +0000 hourly 1 By: Upped The Recent Post/Popular Post Widget Count | Enfranchised Mind http://enfranchisedmind.com/blog/posts/thoughts-on-parallelism/#comment-33663 Upped The Recent Post/Popular Post Widget Count | Enfranchised Mind Tue, 12 Aug 2008 19:31:50 +0000 http://enfranchisedmind.com/blog/archive/2007/02/08/191#comment-33663 [...] Thoughts on Parallelism [...] [...] Thoughts on Parallelism [...]

]]> By: Brian http://enfranchisedmind.com/blog/posts/thoughts-on-parallelism/#comment-33207 Brian Tue, 13 May 2008 00:38:12 +0000 http://enfranchisedmind.com/blog/archive/2007/02/08/191#comment-33207 Actually, I disagree that this is a difference. To tell which locks are "hot", the lock implementation needs to be modified to keep track of which locks are being contended for. In much the same way, the STM implementation knows which ref cell caused the conflict that aborted the transaction, and this information could be recorded. This gives you exactly the same information- where are the contentions? More generaly, you have to get it right before you make it fast. I don't care how fast your program returns the wrong answer. Locks, especially locks plus mutable data, makes things very hard to get right. STM, especially STM + strong static typing + purely functional language, makes it very easy to get things right. Actually, I disagree that this is a difference. To tell which locks are “hot”, the lock implementation needs to be modified to keep track of which locks are being contended for. In much the same way, the STM implementation knows which ref cell caused the conflict that aborted the transaction, and this information could be recorded. This gives you exactly the same information- where are the contentions?

More generaly, you have to get it right before you make it fast. I don’t care how fast your program returns the wrong answer. Locks, especially locks plus mutable data, makes things very hard to get right. STM, especially STM + strong static typing + purely functional language, makes it very easy to get things right.

]]> By: Raoul Duke http://enfranchisedmind.com/blog/posts/thoughts-on-parallelism/#comment-33182 Raoul Duke Sat, 10 May 2008 00:07:59 +0000 http://enfranchisedmind.com/blog/archive/2007/02/08/191#comment-33182 A smart acquaintance hilighted recently to me one seemingly large problem with STM vs. locks: at least with locks it is obvious which ones are "hot" so you can improve performance. With a transaction (whatever the connotation) if you get rollback you do not know why. So you can't rework your code to avoid it in the future so easily. A smart acquaintance hilighted recently to me one seemingly large problem with STM vs. locks: at least with locks it is obvious which ones are “hot” so you can improve performance. With a transaction (whatever the connotation) if you get rollback you do not know why. So you can’t rework your code to avoid it in the future so easily.

]]> By: Enfranchised Mind » Functional Language Adoption http://enfranchisedmind.com/blog/posts/thoughts-on-parallelism/#comment-31149 Enfranchised Mind » Functional Language Adoption Thu, 28 Jun 2007 12:48:33 +0000 http://enfranchisedmind.com/blog/archive/2007/02/08/191#comment-31149 [...] is the continuation of a conversation started at Brian’s post on approaches to parallelism infrastructure, and continued at Thinking [...] [...] is the continuation of a conversation started at Brian’s post on approaches to parallelism infrastructure, and continued at Thinking [...]

]]> By: Thinking Parallel » Blog Archive » News for Week 25/2007 http://enfranchisedmind.com/blog/posts/thoughts-on-parallelism/#comment-31115 Thinking Parallel » Blog Archive » News for Week 25/2007 Wed, 20 Jun 2007 14:43:08 +0000 http://enfranchisedmind.com/blog/archive/2007/02/08/191#comment-31115 [...] are going even further down memory lane with this post on Enfranchised Mind about Parallelism in General. It feels good to see a well-balanced and thought [...] [...] are going even further down memory lane with this post on Enfranchised Mind about Parallelism in General. It feels good to see a well-balanced and thought [...]

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