大约有 36,000 项符合查询结果（耗时：0.0424秒） [XML]
Select n random rows from SQL Server table
...ISTICS IO ON
/* newid()
rows returned: 10000
logical reads: 3359
CPU time: 3312 ms
elapsed time = 3359 ms
*/
SELECT TOP 1 PERCENT Number
FROM Numbers
ORDER BY newid()
/* TABLESAMPLE
rows returned: 9269 (varies)
logical reads: 32
CPU time: 0 ms
elapsed time: 5 ms
*/
SELECT N...
Should I use multiplication or division?
...ython it's faster to multiply than to divide, but as you get closer to the CPU using more advanced VMs or JITs, the advantage disappears. It's quite possible that a future Python VM would make it irrelevant
share
|...
程序员用数据思维教你如何追女生 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...也不清楚对方到底喜欢什么。我们程序员也会遇到这样的问题，但是我们有办法。
程序员的需求分析技能是谈恋爱的必杀技。给你一个手机号码，你可以知道她的QQ，微信，微博，然后进行“大数据分析”，朋友圈里面喜欢发...
What are the file limits in Git (number and size)?
...fect other operations. Cloning can use lots of memory though (and a lot of cpu unless you turn on reachability bitmap feature, which you should).
Will 'git pull' be slow?
If we exclude the server side, the size of your tree is the main factor, but your 25k files should be fine (lin...
Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...
This may have to do with the size of your cpu cache. If 2 rows of the matrix matrix do not fit, then you will loose time swapping in elements from RAM. The extra 4095 elements may just be enough to prevent rows from fitting.
In your case, 2 rows for 2047 2d matrices...
What is stability in sorting algorithms and why is it important?
...need stability, it's more complicated. Stable algorithms have higher big-O CPU and/or memory usage than unstable algorithms. So when you have a large data set, you have to pick between beating up the CPU or the memory. If you're constrained on both CPU and memory, you have a problem. A good compromi...
谈谈创业公司技术的工作模式 - 资讯 - 清泛网 - 专注C/C++及内核技术
...、测试、运维不管做什么工作，都需要站在一定高度思考问题，既然创业就需要以创业的角度思考，这样对自己的职业发展有帮助，也可以做好产品。
在根据一个大需求技术总监和大家讨论，把模糊的东西逐步清晰化得到一个...
Why is a boolean 1 byte and not 1 bit of size?
...
Because the CPU can't address anything smaller than a byte.
share
|
improve this answer
|
follow
...
jasmine: Async callback was not invoked within timeout specified by jasmine.DEFAULT_TIMEOUT_INTERVAL
...at helped until I noticed my Macbook was running sluggishly. I noticed the CPU was pegged by another process, which I killed. The Jasmine async error disappeared and my tests are fine once again.
Don't ask me why, I don't know. But in my circumstance it seemed to be a lack of system resources at fa...
What's the difference between emulation and simulation? [duplicate]
...tly like the real device would. For example, a NES emulator implements the CPU, the sound chip, the video output, the controller signals, etc. The unmodified code from a NES castridge can be dumped and then the resulting image can be loaded into our emulator and played.
A simulator is a partial imp...