大约有 4,900 项符合查询结果（耗时：0.0265秒） [XML]
Count(*) vs Count(1) - SQL Server
..., query store overhead, triggers, etc.). It is maybe a few thousand extra CPU instructions. So, count(1) does a tiny bit less work during compilation (which will usually happen once and the plan is cached across multiple subsequent executions). For execution time, assuming the plans are the same ...
Are there any downsides to passing structs by value in C, rather than passing a pointer?
...
Unless your struct is tiny or your CPU has many registers (and Intel CPUs have not), the data ends up on the stack and that is also memory and as fast/slow as any other memory. A pointer on the other hand is always small and just a pointer and the pointer itse...
How to simulate Android killing my process
...if it is in the background and the OS decides it needs the resources (RAM, CPU, etc.). I need to be able to simulate this behaviour during testing so that I can ensure that my application is behaving correctly. I want to be able to do this in an automated way so that I can test if the application be...
How to measure time taken by a function to execute
...
In Chrome, press F12 and select the Profiles tab, then Collect JavaScript CPU Profile.
In Firefox, install/open Firebug, and click on the Profile button.
In IE 9+, press F12, click on Script or Profiler (depending on your version of IE).
Alternatively, on your development machine, you can add i...
Passing a method as a parameter in Ruby
..._name),...) and not method(:Class.method_name)
– V. Déhaye
Feb 1 '17 at 15:31
Thanks to your answer, I discovered the...
Formula to determine brightness of RGB color
... if you do it as: Y = (R<<1+R+G<<2+B)>>3 (thats only 3-4 CPU cycles on ARM) but I guess a good compiler will do that optimisation for you.
– rjmunro
Mar 11 '15 at 11:16
...
How to access parent Iframe from JavaScript
... and I want to access them from the code inside
– José Leal
Jun 1 '09 at 14:53
Still get "Blocked a frame with origin...
Do Google refresh tokens expire?
...ken is something different than 'never expire'.
– Kapé
Mar 28 '15 at 21:40
1
So how can your cod...
How to determine an object's class?
...er so much. Something is changing here...
– Adrián Pérez
Sep 22 '13 at 17:32
...
What are important languages to learn to understand different approaches and concepts? [closed]
...oreover, it is also a very universal, C compilers exist for (almost) every CPU architecture ever devised.
– dietr
May 12 '11 at 8:05
add a comment
|
...