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裁员！裁员！创业者们的2016“寒冬大逃杀” - 资讯 - 清泛网 - 专注IT技能提升
...候，“什么时候盈利”忽然成了几乎每个投资人都会问的问题，但在之前的三轮融资都没有人提过。当时大家关心的都是订单量、GMV和增速。
“无论公司当下有没有收入，从财务模型上看，都是要在收敛的、亏损是在变小的。...
Comparison of full text search engine - Lucene, Sphinx, Postgresql, MySQL?
...al performance, then you definitely need a good book about Lucene.
As for CPU & RAM requirements, performing a search in Lucene doesn't task your CPU too much, though indexing your data is, although you don't do that too often (maybe once or twice a day), so that isn't much of a hurdle.
It doe...
Running the new Intel emulator for Android
... should work much better than the previous version (which has emulated ARM CPU). Here are some links about it: this and this .
...
廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术
...没有共享存储的情况下解决非结构化数据高可靠性存储的问题1、问题产生背景三台TOMCAT 服务器通过负载均衡设备对外提供WEB服务。怎么保证...在没有共享存储的情况下解决非结构化数据高可靠性存储的问题
1、问题产生背景
...
Is a LINQ statement faster than a 'foreach' loop?
...parison.
Re PLINQ; parallelism may reduce the elapsed time, but the total CPU time will usually increase a little due to the overheads of thread management etc.
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What exactly are “spin-locks”?
...lly short, because your thread now has to wait for a preemption to receive CPU time again.
Besides, kernel objects are not available in every state of the kernel, such as in an interrupt handler or when paging is not available etc.
Spinlocks don't cause preemption but wait in a loop ("spin") till th...
What's the Android ADB shell “dumpsys” tool and what are its benefits?
...m information in a simple string representation.
Possibility to use dumped CPU, RAM, Battery, storage stats for a
pretty charts, which will allow you to check how your application
affects the overall device!
What information can we retrieve from dumpsys shell command and how we can use it
If you ...
How to make execution pause, sleep, wait for X seconds in R?
...(x)
{
p1 <- proc.time()
Sys.sleep(x)
proc.time() - p1 # The cpu usage should be negligible
}
testit(3.7)
Yielding
> testit(3.7)
user system elapsed
0.000 0.000 3.704
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What is the purpose of XORing a register with itself? [duplicate]
...it the fastest way it knows. A bit operation like XOR might take only one CPU cycle, whereas a copy (from one register to another) can take a small handful.
Often compiler writers will even have different behaviors given different target CPU architectures.
...
John Carmack's Unusual Fast Inverse Square Root (Quake III)
...ng result, until required accuracy is met. This is exactly how it works in CPU/FPU! But it seems that only one iteration was enough, which was also a blessing for the speed. CPU/FPU does as many iterations as needed to reach the accuracy for the floating point number in which the result is stored an...