pipeline

问题 I came across several references to the concept of a dual issue processor (I hope this even makes sense in a sentence). I can't find any explanation of what exactly dual issue is. Google gives me links to micro-controller specification, but the concept isn't explained anywhere. Here's an example of such reference. Am I looking in the wrong place? A brief paragraph on what it is would be very helpful. 回答1: Dual issue means that each clock cycle the processor can move two instructions from one

问题 When combining stderr with stdout, why does 2>&1 need to come before a | (pipe) but after a > myfile (redirect to file)? To redirect stderr to stdout for file output: echo > myfile 2>&1 To redirect stderr to stdout for a pipe: echo 2>&1 | less My assumption was that I could just do: echo | less 2>&1 and it would work, but it doesn't. Why not? 回答1: A pipeline is a |-delimited list of commands . Any redirections you specify apply to the constituent commands (simple or compound), but not to the

问题 I observed a few times now that A | B | C may not lead to immediate output, although A is constantly producing output. I have no idea how this even may be possible. From my understanding all three processes ought to be working on the same time, putting their output into the next pipe (or stdout) and taking from the previous pipe when they are finished with one step. Here's an example where I am currently experiencing that: tcpflow -ec -i any port 8340 | tee second.flow | grep -i "\(<

问题 I have written an application which uses a pipeline of 15 XSL stylesheets, and I'm beginning to work on tuning its performance. It's designed to be portable, so that it can be run in both the web browser environment, and on the desktop. On the desktop, I think it may make sense to keep the stylesheets separated out as a pipeline of multiple transformations, as this allows each individual transformation to be run in its own thread, which can be very efficient on CPUs with multiple cores.

问题 I'm currently developing a cache that needs increase a few hundred counters for every call like this: redis.pipelined do keys.each{ |key| redis.incr key } end In my profiling now I saw that the replies I don't need are still collected by the redis gem and waste some valueable time. Can I tell redis in some way that I'm not interested in the replies? Is there a better way to increment lots of values. I didn't find a MINCR command, for example.. Thanks in advance! 回答1: Yes... in 2.6, at least.

问题 Is piping parameter into line is working only for functions that accept one parameter? If we look at the example at Chris Smiths' page, // Using the Pipe-Forward operator (|>) let photosInMB_pipeforward = @"C:\Users\chrsmith\Pictures\" |> filesUnderFolder |> Seq.map fileInfo |> Seq.map fileSize |> Seq.fold (+) 0L |> bytesToMB where his filesUnderFolder function was expecting only rootFolder parameter, what if the function was expecting two parameters, i.e. let filesUnderFolder size rootFolder

问题 I need to pass a parameter, sample_weight , to my RandomForestClassifier like so: X = np.array([[2.0, 2.0, 1.0, 0.0, 1.0, 3.0, 3.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 5.0, 3.0, 2.0, '0'], [15.0, 2.0, 5.0, 5.0, 0.466666666667, 4.0, 3.0, 2.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 7.0, 14.0, 2.0, '0'], [3.0, 4.0, 3.0, 1.0, 1.33333333333, 1.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0

问题 My question in general about render pipeline, i have seen ASP.NET MVC pipeline scheme and there was a step called View Engine, so how it works? I want to know about this scenarios: What is rendered first, master page or view? If i use Response.End() in @{} block at the start of page does this interupt execution of page and stops render of the view? 回答1: What is rendered first, master page or view? The view. The parser starts from the Layout and builds a LIFO (Last In First Out) structure

问题 I need to implement pipeline if Service Fabric's Reliable Services, and I need some guidelines about what of these approaches is preferable from the viewpoint of reliability simplicity and simple good design: 回答1: I have been investigating this topic a lot as well (to be applied to my work for NServiceBus and MessageHandler) and would like to provide my thoughts on the matter. However I haven't determined what the best model is yet. If you disregard the practical implementation with

问题 In cygwin, the following code works fine $ cat junk bat bat bat $ cat junk | sort -k1,1 |tr 'b' 'z' > junk $ cat junk zat zat zat But in the linux shell(GNU/Linux), it seems that overwriting doesn't work [41] othershell: cat junk cat cat cat [42] othershell: cat junk |sort -k1,1 |tr 'c' 'z' zat zat zat [43] othershell: cat junk |sort -k1,1 |tr 'c' 'z' > junk [44] othershell: cat junk Both environments run BASH. I am asking this because sometimes after I do text manipulation, because of this