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What is the difference between an interface and abstract class?
...return this.fuel;
}
}
Implementing an interface consumes very little CPU, because it's not a class, just a bunch of names, and therefore there isn't any expensive look-up to do. It's great when it matters, such as in embedded devices.
Abstract classes
Abstract classes, unlike interfaces, a...
How expensive is the lock statement?
...hat this is impossible to quantify, it heavily depends on the state of the CPU memory write-back buffers and how much data that the prefetcher gathered has to be discarded and re-read. Which are both very non-deterministic. I use 150 CPU cycles as a back-of-the-envelope approximation that avoids m...
Why must wait() always be in synchronized block
...the x-level cache (a.k.a. 1st/2nd/3rd-level caches) of the thread handling CPU core.
But synchronized blocks are only one side of the medal: If you actually access an object within a synchronized context from a non-synchronized context, the object still won't be synchronized even within a synchroni...
What is “(program)” in Chrome debugger’s profiler?
... Regarding high % of program(), sometimes css animations lead to a high CPU usage, which will be reflected in program(). Unfortunately the profiler can't help pin point the source.
– ılǝ
Dec 15 '15 at 15:13
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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...
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
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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...