benchmarking

问题 Can anyone explain why there is a performance difference between the following two segments? It's statistically significant that the second timer call reports a smaller number than the first timer call. My only thoughts would be that Netlogo could be caching the turtles in memory. Is this the expected behavior or is there a bug? to setup clear-all crt 100 let repetitions 10000 ;;Timing assigning x to self reset-timer repeat repetitions [ ask turtles [ let x self ] ] show timer ;;Timing

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . I've seen benchmarks of Actor model implementations done in terms of their actors. For example, Akka actors are very lightweight (600 bytes per actor) and millions of them can be created. However, I've never seen a benchmark done in terms of message-passing throughput. For example, given some number of actors,

问题 So pretty much every question related to capacity in ArrayList is how to use it or (oddly) access it and I am quite familiar with that information. What I am interested in whether it is actually worth using the ArrayList constructor that sets capacity if you happen to know or have a rough idea how many items will be in the ArrayList? Are there any comprehensive benchmarks comparing how long it takes to just use naive adding of elements to an ArrayList versus pre-setting the capacity of an

问题 So let's say I want to take the vector X = 2*1:N and raise e to the exponent of each element. (Yes, I recognize the best way to do that is simply by vectorization exp(X), but the point of this is to compare for loop with sapply). Well I tested by incrementally trying three methods (one with for loops, two with sapply applied in a different manner) with different sample sizes and measuring the corresponding time. I then plot the sample size N vs time t for each method. Each method is indicated

问题 I'm using Apache 2.4.2 in Ubuntu virtual machine. I use this to load test, sending request to some HTTPS url. Number of failed request is zero. But none of my request can truly be processed (looked up in database already). With the same url, invoke it through the browser is ok (database updated). So it was purely the issue of Apache Benchmark. Here's my Apache Benchmark command: # ab -n 100 -c 10 -k -f ALL -g "/home/administrator/Desktop/g.txt" -e "home/administrator/Desktop/e.txt" "https:/

问题 I want to benchmark the time it takes to load a module (a find_by_id(234) call). Also, how can I track the time it takes to load a page, I know I get this information when I run rails server, but this is in debug mode, I want production speed benchmarks, possible? 回答1: For a quick check, I would highly recommend checking out Benchmark. An example would be: require "benchmark" time = Benchmark.measure do a.find_by_id(234) end puts time However for production level benchmarking, I would check

问题 I want to benchmark PHP vs Pylons. I want my comparison of both to be as even as possible, so here is what I came up with: PHP 5.1.6 with APC, using a smarty template connecting to a MySQL database Python 2.6.1, using Pylons with a mako template connecting the the same MySQL database Is there anything that I should change in that setup to make it a more fair comparison? I'm going to run it on a spare server that has almost no activity, 2G of ram and 4 cores. Any suggestions of how I should or

问题 I'm trying to speed up the startup for my program, and noticed I had a method that was acting a little strange. The program itself is a Lightweight Java Game Library application that reads in points from a file, and renders them. The method of note is the method that reads from the file. What's curious about the method is I call it twice during my tests, where the first call takes 2837ms to complete, and the second only takes 1704ms. The difference between the two calls are minimal. The

问题 I am practicing my Golang by writing a simple Redis clone. How do i write a benchmark script that would establish X connections per second at C concurrency level to deal with my server's protocol and measure how many ops/sec? I can simply write a script that would actually do this: for i := range(1000) { // Open connection // Perform command // Close connection } But i want to know the concept behind distributing the number of connections per concurrency level per second. 回答1: This is best

问题 I am wondering if it is possible to create a clever macro to automatically bench a "process" in C and using only C. Let's say I have a small structure like this: typedef struct pbench { char description[256]; int nbenchs; double times; } ProcessBench; And a macro (with get_time() being a function returning a double): #define BENCH(process, bench_struct, description) \ int i; \ bench_struct.description = description; \ bench_struct.nbenchs = 50; \ double start = get_time(); \ for (i = 0; i <