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What is the runtime performance cost of a Docker container?
... the kernel's support for different process namespaces, device namespaces, etc.; one namespace isn't inherently more expensive or inefficient than another, so what actually makes Docker have a performance impact is a matter of what's actually in those namespaces.
Docker's choices in terms of how ...
How to Deal with Temporary NSManagedObject instances?
...riginalContext persistentStore]];
Then you add new objects, mutate them, etc.
When it comes time to save, you need to call [tempContext save:...] on the tempContext, and handle the save notification to merge that into your original context. To discard the objects, just release this temporary cont...
从一个开发的角度看负载均衡和LVS - 更多技术 - 清泛网 - 专注C/C++及内核技术
...允许的情况下我们会采用软负载，软负载解决的两个核心问题是：选谁、转发，其中最著名的是LVS（Linux Virtual Server）。
三、软负载——LVS
LVS是四层负载均衡，也就是说建立在OSI模型的第四层——传输层之上，传输层上有...
为什么我们程序员写不出好代码？ - 杂谈 - 清泛网 - 专注C/C++及内核技术
...提交的仓库里。如果代码行数都计算在内的话，原本一个问题只需10行代码即可解决，程序员有可能编写5000行代码，来让功能更加灵活和兼容，这样，他的代码总量就会增加5000行了。
衡量生产力反而会使代码变的更糟，让项目...
Why is processing a sorted array slower than an unsorted array?
...e accessed in memory-order. They have been allocated consecutively in RAM. CPUs love accessing memory sequentially because they can speculatively request the next cache line so it will always be present when needed.
When you are sorting the list you put it into random order because your sort keys a...
How to fix: “HAX is not working and emulator runs in emulation mode”
...nstalling non-open-source and desktop apps (i.e. chrome, firefox, eclipse, etc.):
brew cask install intel-haxm
Android Studio
If you are using Android Studio then you can achieve the same result from the menu Tools ➞ SDK Manager, and then on the SDK Tools tab, select the checkbox for Intel x8...
What is LDAP used for?
...ntain by network administrators. For example you can:
use the same login/passwd to login on an Intranet and on your local computer.
give specific permissions to a group of user. For example some could access some specific page of your Intranet, or some specific directories on a shared drive.
get a...
How to convert decimal to hexadecimal in JavaScript
...
I am "pulling" numbers from an array ('255,0,55', etc) and the .toString(16) didn't work. All I got were the same numbers! I added the "Number" function to the front, and now it works! Only spent about four hours trying to find the solution!!
– Cristofa...
Is memcached a dinosaur in comparison to Redis? [closed]
...ation to memcached. Other things are also dated (redis is super fast now, etc), but FYI if you're here five years later...
– dannysauer
Mar 11 '15 at 16:02
...
Pointer to pointer clarification
...ay
*ipp = ip2;
The * operator turns a pointer back into a variable. We fetch the value of ipp, which is "pointer to ip1 and turn it into a variable. What variable? ip1 of course!
Therefore this is simply another way of saying
ip1 = ip2;
So we fetch the value of ip2. What is it? "pointer to j...