大约有 3,700 项符合查询结果（耗时：0.0184秒） [XML]
Multiprocessing: How to use Pool.map on a function defined in a class?
...eak
q_out.put((i, f(x)))
def parmap(f, X, nprocs=multiprocessing.cpu_count()):
q_in = multiprocessing.Queue(1)
q_out = multiprocessing.Queue()
proc = [multiprocessing.Process(target=fun, args=(f, q_in, q_out))
for _ in range(nprocs)]
for p in proc:
p.da...
Is there any difference between GROUP BY and DISTINCT
...---------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 58 | 174 | 44 (19)| 00:00:01 |
| 1 | HASH GROUP BY | | 58 | 174 | 4...
Difference between static memory allocation and dynamic memory allocation
...ister' variables. As expected, register variables should be allocated on a CPU's register, but the decision is actually left to the compiler. You may not turn a register variable into a reference by using address-of.
register int meaning = 42;
printf("%p\n",&meaning); /* this is wrong and will...
How would Git handle a SHA-1 collision on a blob?
...ations. This took the equivalent processing power as 6,500 years of single-CPU computations and 110 years of single-GPU computations.
b/ would forge one file (with the same SHA1), but with the additional constraint its content and size would produce the identical SHA1 (a collision on the content al...
Why use armeabi-v7a code over armeabi code?
...ices, but will be a lot slower, and won't take advantage of newer devices' CPU capabilities. Do take some benchmarks for your particular application, but removing the armeabi-v7a binaries is generally not a good idea. If you need to reduce size, you might want to have two separate apks for older (a...
Why doesn't JavaScript support multithreading?
...he internal mechanism (aka callback/promise/async-await)
if you need to do CPU bound ops, then use worker threads.
Worker threads are intended to be long-living threads, meaning you spawn a background thread and then you communicate with it via message passing.
Otherwise, if you need to execute a...
What are the differences between a UIView and a CALayer?
...ore. Working with UIViews happens on the main thread, it means it is using CPU power.
CALayer: Layers on other hand have simpler hierarchy. That means they are faster to resolve and quicker to draw on the screen. There is no responder chain overhead unlike with views. Layers are drawn directly on t...
Significance of bool IsReusable in http handler interface
...
Context switching is when a CPU stops processing on one thread and starts processing on another. I.E. the CPU switched it's context from one thread to another. This happens constantly in PCs, it gave us the illusion of multitasking before there were m...
Python 3.x rounding behavior
...
I saw that. And my first reaction: Who is using a 16-bit CPU that is incapable of representing all permutations of "2.67x" ? Saying that fractions can't be expressed in float seems like a scapegoat here: no modern CPU is that inaccurate, in ANY langauge (except Python?)
...
Fastest way to determine if an integer is between two integers (inclusive) with known sets of values
...
My data is not sorted and my tests are on iPhone arm CPU. Your results with different data and CPU may differ.
– jjxtra
Feb 3 '17 at 14:24
...