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通信连接组件 · App Inventor 2 中文网
...)或物联网(IoT)世界的连接设备，以及带宽和电池功率非常高的移动应用的理想选择。
例如，它已被用于通过卫星链路与代理通信的传感器、与医疗服务提供者的拨号连接，以及一系列家庭自动化和小型设备场景。它也是移动应...
Generating a unique machine id
... We use all physical NICs - excluding virtual NICS, blue-tooth, etc. They're all combined to create unified hash.
– Paul Alexander
Sep 19 '12 at 23:13
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绘画动画组件 · App Inventor 2 中文网
...精灵应如何相对于其他球形精灵和图像精灵分层，编号较高的层位于编号较低的层之前。
事件
被碰撞时(其他精灵)
事件将在两个启用的精灵（球形精灵或图像精灵）碰撞时触发。
请注意，检查与旋转的图像精灵碰撞...
FixedThreadPool vs CachedThreadPool: the lesser of two evils
... How Java maps threads to OS threads, how that maps threads to CPU threads etc.? I'm asking because creating 150 threads within in ONE JRE only makes sense if you have massive CPU cores/threads underneath, which most likely is not the case. Depending on the OS and RAM in use, creating more than n th...
Difference between a theta join, equijoin and natural join
... created by various vendors such as Microsoft's SQL Server, Oracle's MySQL etc. ) don't even bother supporting this, it is just bad practice (or purposely chose not to implement it). Imagine that a developer comes and changes the name of the second column in Product from Price to Cost. Then all the ...
When to use thread pool in C#? [closed]
... a thread is waiting on a synchronization object (event, semaphore, mutex, etc) then the thread does not consume CPU.
– Brannon
Sep 28 '08 at 7:18
7
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Thread context switch Vs. process context switch
...t when you switch address space, more memory access (paging, segmentation, etc) and you have to flush TLB when entering or exiting a new process...
How to benchmark efficiency of PHP script
...ws to define steps in the code and reports time, memory usage, server load etc between two steps.
Something like:
$appgati->Step('1');
// Do some code ...
$appgati->Step('2');
$report = $appgati->Report('1', '2');
print_r($report);
Sample output array:
Array
(
...
How many threads is too many?
...you reach some bottleneck be it CPU, database throughput, disk throughput, etc, adding more threads won't increase the overall performance. But until you hit that point, add more threads!
Note that this assumes the system(s) in question are dedicated to your app, and you don't have to play nicely ...
.bashrc at ssh login
...ly container for persistent storage) - BUT you may also want to check /etc/passwd to check your login shell is /bin/bash & not /bin/sh -------> /bin/dash
– Stuart Cardall
May 15 '15 at 22:27
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