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How is Docker different from a virtual machine?
...ualization work at a low level?
In this case the VM manager takes over the CPU ring 0 (or the "root mode" in newer CPUs) and intercepts all privileged calls made by the guest OS to create the illusion that the guest OS has its own hardware. Fun fact: Before 1998 it was thought to be impossible to ac...
What does SynchronizationContext do?
...e.g. to a ThreadPool worker thread), or (at least in theory) to a specific CPU core, or even to another network host. Where your delegates end up running is dependent on the type of SynchronizationContext used.
Windows Forms will install a WindowsFormsSynchronizationContext on the thread on which th...
Best Practice for Exception Handling in a Windows Forms Application?
...oad, but everything else should be fine), or whether it indicates that the CPU is on fire and one should head for the exits as fast as possible? Something like ArgumentException could indicate either, depending upon the circumstances in which it's thrown.
– supercat
...
Are Stored Procedures more efficient, in general, than inline statements on modern RDBMS's? [duplica
...cro level.
Still an advantage?
Not very noticeable at all on the modern CPU, but if you are sending a single SQL statement that is VERY large eleventy-billion times a second, the parsing overhead can add up.
Pre-generated query execution plan.
If you have many JOINs the permutations can grow qu...
How does libuv compare to Boost/ASIO?
... Process
Spawning: yes Process
System Queries:
CPU: yes no
Network Interface: yes no
Serial Ports: no yes
TTY: yes no
Shared Library Loading: yes Extension[2]
...
Are Exceptions in C++ really slow
... handler)
So, mostly cache misses, and thus not trivial compared to pure CPU code.
Note: for more details, read the TR18015 report, chapter 5.4 Exception Handling (pdf)
So, yes, exceptions are slow on the exceptional path, but they are otherwise quicker than explicit checks (if strategy) in gene...
How do you parse and process HTML/XML in PHP?
...k.
Again, I would not recommend this parser. It is rather slow with high CPU usage. There is also no function to clear memory of created DOM objects. These problems scale particularly with nested loops. The documentation itself is inaccurate and misspelled, with no responses to fixes since 14 Apr ...
What's the difference between an inverted index and a plain old index?
...or documents set) as fast as possible. Think about the limit of memory and cpu, other index can't finish this job.
You can read lucene document for more details. It's a open source search engine. http://lucene.apache.org/java/docs/index.html
...
When to use Tornado, when to use Twisted / Cyclone / GEvent / other [closed]
... the word "concurrency" to mean "concurrent parallel execution on multiple CPUs". Twisted can do concurrent I/O scheduling via asynchronous (callback-based) I/O. GEvent can do concurrent I/O scheduling via a micro-thread scheduler. In Twisted, using spawnProcess, this I/O scheduling can be transla...
Algorithm for creating a school timetable
...e same time produced about the same quality.
The calculation (on some 1GHz CPU) would take some 1h to stabilize near 10^+300, generating schedules that looked quite nice, for said 10x10x10 test case.
The problem is easily paralellizable by providing networking facility that would exchange best speci...