The question is very confusing. Does defining an instance as dynamic in C# mean: By “defining an instance” do you mean “declaring a variable”? The compiler does not perform compile-time type checking, but run-time checking takes place like it always does for all instances. What do you mean by “run-time checking like it always does”? … Read more
Verified that this works really nicely for API >= 11: listView.setFriction(ViewConfiguration.getScrollFriction() * FRICTION_SCALE_FACTOR) Note that scroll speed decreases as friction increases. To decrease scroll momentum by a suitable amount, I ended up using a friction scale factor of 10. YMMV.
setTimeout does not have a minimal delay of 0ms. The minimal delay is anywhere in the range of 5ms-20ms dependent on browsers. My own personal testing shows that setTimeout doesn’t place your back on the event stack immediately Live Example It has an arbitary minimal time delay before it gets called again var s = … Read more
I personally feel like $array[] is cleaner to look at, and honestly splitting hairs over milliseconds is pretty irrelevant unless you plan on appending hundreds of thousands of strings to your array. I ran this code: $t = microtime(true); $array = array(); for($i = 0; $i < 10000; $i++) { $array[] = $i; } print … Read more
As has already been mentioned, this is basicly a hardware problem. Disk access is always slow, and most file systems aren’t really designed to handle directories with that many files. If you for some reason have to store all the files in the same directory, I think you’ll have to maintain your own cache. This … Read more
This is not strictly an answer but rather my contribution to the discussion I used the profiler to investigate a slightly-modified version of your code: N_arr = 200:400:3800; %// for medium to large sized input array for k1 = 1:numel(N_arr) A = randi(1,N_arr(k1)); [~]=eq(A,0); clear A A = randi(1,N_arr(k1)); [~]=not(A); clear A end I used … Read more
You’re setting alist only once. The first call to “tryway” clears it, then every successive call does nothing. def tryway(): alist = range(1000) try: while True: alist.pop() except IndexError: pass def ifway(): alist = range(1000) while True: if alist == []: break else: alist.pop() if __name__==’__main__’: from timeit import Timer print “Testing Try” tr = … Read more
The idea is that you improve the performance of aggregation queries by using MapReduce on a sharded database that is distributed over multiple machines. I did some comparisons of the performance of Mongo’s Mapreduce with a group-by-select statement in Oracle on the same machine. I did find that Mongo was approximately 25 times slower. This … Read more
You might want to look at pt-online-schema-change from Percona toolkit. Essentially what it does is: Copies original table structure, runs ALTER. Copies rows from old table to newly created one. Uses triggers to track and sync changes while copying. When everything is finished it swaps tables by renaming both. Works very well for single instance … Read more
When you use new Thread you’re really creating a new thread every time you execute that. AsyncTask however, uses a static pool of max 128 threads and will reuse an old thread whenever it exists. So, running AsyncTask 10 times in serial will only create one thread that runs the task 10 times instead of … Read more