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App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
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How do cache lines work?
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Another problem the cache line solves (beside reading ahead and saving / freeing six bits on the address bus) is in the way the cache is organized. For example if a cache would be divided in 8 byte (64bit) blocks (cells) one needs to store the address of the memory cell this cache cell holds the...
How to screenshot website in JavaScript client-side / how Google did it? (no need to access HDD) [du
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You can use a similar technique using GrabzIt's free HTML to Image JavaScipt API you just need to ensure that all resources, CSS, Javascript and image files etc in the web page HTML need to use absolute URLs' then you use JavaScript to get the outer HTML and pass it to Gra...
Separate REST JSON API server and client? [closed]
...ad of me, he could fake out the API very easily and build the UI.
API for free. Having open access to the data in your app is quickly becoming a standard feature. If you start with an API from the ground up, you get this for free.
Clean separation. It is better to think of your app as an API with c...
Multiprocessing - Pipe vs Queue
...the default) and timeout is None (the default), block if necessary until a free slot is available. If timeout is a positive number, it blocks at most timeout seconds and raises the queue.Full exception if no free slot was available within that time." Are you sure about your answer?
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Why doesn't C++ have a garbage collector?
...weep is faster (less impact on overall performance) but it suffers from a "freeze the world" syndrome: i.e. when the GC kicks in, everything else is stopped until the GC has made its cleanup. If you wish to build a server that answers in a few milliseconds... some transactions will not live up to yo...
INNER JOIN vs LEFT JOIN performance in SQL Server
...not been discussed yet.
When using an outer join, the optimizer is always free to drop the outer joined table from the execution plan if the join columns are the PK of the outer table, and none of the outer table columns are referenced outside of the outer join itself. For example SELECT A.* FROM A...
Shared-memory objects in multiprocessing
... utility class to work around it.
I'm using multiprocessing.RawArray (lockfree), and also the access to the arrays is not synchronized at all (lockfree), be careful not to shoot your own feet.
With the solution I get speedups by a factor of approx 3 on a quad-core i7.
Here's the code:
Feel free t...
C++ - passing references to std::shared_ptr or boost::shared_ptr
...o an existing shared_ptr.
The downside is that copied a shared_ptr is not free: even "lock-free" implementations have to use an interlocked operation to honour threading guarantees. So there may be situations where a program can be significantly sped up by changing a shared_ptr into a shared_ptr &a...
Interfaces vs. abstract classes [duplicate]
...led
Ability to provide behavior related or unrelated to the interface for "free"
Interfaces are merely data passing contracts and do not have these features. However, they are typically more flexible as a type can only be derived from one class, but can implement any number of interfaces.
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