Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 3 years ago. Improve this question I have worked quite a bit with memcached the last weeks and just found out about … Read more
I have two t-sql queries using SqlServer 2005. How can I measure how long it takes for each one to run? Using my stopwatch doesn’t cut it. 6 Answers 6
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 years ago. Improve this question There is something I have never understood. How can a great big PC game like GTA IV use 50% of … Read more
I understand gcc’s –ffast-math flag can greatly increase speed for float ops, and goes outside of IEEE standards, but I can’t seem to find information on what is really happening when it’s on. Can anyone please explain some of the details and maybe give a clear example of how something would change if the flag … Read more
I am making some benchmarks with CUDA, C++, C#, Java, and using MATLAB for verification and matrix generation. When I perform matrix multiplication with MATLAB, 2048×2048 and even bigger matrices are almost instantly multiplied. 1024×1024 2048×2048 4096×4096 ——— ——— ——— CUDA C (ms) 43.11 391.05 3407.99 C++ (ms) 6137.10 64369.29 551390.93 C# (ms) 10509.00 300684.00 … Read more
I had installed Android Studio 1.0 RC 2. I have 4GB of RAM installed, but after starting Android Studio and launching Android Emulator, more than 90% of physical memory has been used by only these two. Is there is any way to reduce this memory use? Due to this memory issue, I can’t open other … Read more
Core is GHC’s intermediate language. Reading Core can help you better understand the performance of your program. Someone asked me for documentation or tutorials on reading Core, but I couldn’t find much. What documentation is available for reading GHC Core? Here’s what I’ve found so far: Write Haskell as fast as C: exploiting strictness, laziness … Read more
Can anyone give me the approximate time (in nanoseconds) to access L1, L2 and L3 caches, as well as main memory on Intel i7 processors? While this isn’t specifically a programming question, knowing these kinds of speed details is neccessary for some low-latency programming challenges. 5 Answers 5
I have a big performance problem in R. I wrote a function that iterates over a data.frame object. It simply adds a new column to a data.frame and accumulates something. (simple operation). The data.frame has roughly 850K rows. My PC is still working (about 10h now) and I have no idea about the runtime. dayloop2 … Read more
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 11 months ago. The community reviewed whether to reopen this question 3 days ago and left it closed: Original close reason(s) … Read more
