performance

问题 I want to replicate data from a boat offshore to an onshore site. The connection is sometimes via a satellite link and can be slow and have a high latency. Latency in our application is important, the people on-shore should have the data as soon as possible. There is one table being replicated, consisting of an id, datetime and some binary data that may vary in length, usually < 50 bytes. An application off-shore pushes data (hardware measurements) into the table constantly and we want these

问题 Previously I asked this question on SO about splitting an audio file. The answer I got from @Jean V. Adams worked relatively (downside: input was stereo and output was mono, not stereo) well for small sound objects: library(seewave) # your audio file (using example file from seewave package) data(tico) audio <- tico # this is an S4 class object # the frequency of your audio file freq <- 22050 # the length and duration of your audio file totlen <- length(audio) totsec <- totlen/freq # the

问题 I am on Windows 7 64-bit, VS2013 (x64 Release build) experimenting with memory orderings. I want to share access to a container using the fastest synchronization. I opted for atomic compare-and-swap. My program spawns two threads. A writer pushes to a vector and the reader detects this. Initially I didn't specify any memory ordering, so I assume it uses memory_order_seq_cst ? With memory_order_seq_cst the latency is 340-380 cycles per op. To try and improve performance I made stores use

问题 Previously I asked this question on SO about splitting an audio file. The answer I got from @Jean V. Adams worked relatively (downside: input was stereo and output was mono, not stereo) well for small sound objects: library(seewave) # your audio file (using example file from seewave package) data(tico) audio <- tico # this is an S4 class object # the frequency of your audio file freq <- 22050 # the length and duration of your audio file totlen <- length(audio) totsec <- totlen/freq # the

问题 Previously I asked this question on SO about splitting an audio file. The answer I got from @Jean V. Adams worked relatively (downside: input was stereo and output was mono, not stereo) well for small sound objects: library(seewave) # your audio file (using example file from seewave package) data(tico) audio <- tico # this is an S4 class object # the frequency of your audio file freq <- 22050 # the length and duration of your audio file totlen <- length(audio) totsec <- totlen/freq # the

问题 I need to calculate a CRC-64 using this setup into this wonderful website: http://www.sunshine2k.de/coding/javascript/crc/crc_js.html As you can see I require "input reflected" and that means that I need to reverse the bit order of any byte (a bit annoying). For the moment, I implemented this with a lookup table (for example 0x55 -> 0xAA), but I was wondering if there is any property of CRC which can be used to be more efficient. This is my code (in C): static const unsigned long long CRC64

问题 Due to a wrong UX design, I have got a very low CLS score. However, I have fixed the mistake over a month ago. But the Field Data still remains not updated. What should I do to force update the Field data? 回答1: What should I do to force update the Field data? You can't I am afraid. However if you want to see your Cumulative Layout Shift data in real time (to catch any problems / confirm fixes early) you can use the "web vitals library" - please see the final level 3 heading ("Tracking using

问题 Due to a wrong UX design, I have got a very low CLS score. However, I have fixed the mistake over a month ago. But the Field Data still remains not updated. What should I do to force update the Field data? 回答1: What should I do to force update the Field data? You can't I am afraid. However if you want to see your Cumulative Layout Shift data in real time (to catch any problems / confirm fixes early) you can use the "web vitals library" - please see the final level 3 heading ("Tracking using

问题 Due to a wrong UX design, I have got a very low CLS score. However, I have fixed the mistake over a month ago. But the Field Data still remains not updated. What should I do to force update the Field data? 回答1: What should I do to force update the Field data? You can't I am afraid. However if you want to see your Cumulative Layout Shift data in real time (to catch any problems / confirm fixes early) you can use the "web vitals library" - please see the final level 3 heading ("Tracking using

问题 I’ve been working on a C# maze generator for a while which can generate mazes of like 128000x128000 pixels. All memory usage is optimized already so I’m currently looking at speeding the generation up. A problem (well more off an interest point) I found was the following (just some example code to illustrate the problem): This code runs in about 1.4 seconds on my machine when pixelChanged is null: public void Go() { for (int i = 0; i < bitjes.Length; i++) { BitArray curArray = bitjes[i]; for