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Matteo Spreafico

Fabulous Adventures In Coding : The Stack Is An Implementation Detail, Part One - 0 views

blogs.msdn.com/...-an-implementation-detail.aspx

clr cli .NETGeneral c# memory allocation

shared by Matteo Spreafico on 14 Aug 09 - Cached
  • Almost every article I see that describes the difference between value types and reference types explains in (frequently incorrect) detail about what “the stack” is and how the major difference between value types and reference types is that value types go on the stack.
  • I find this characterization of a value type based on its implementation details rather than its observable characteristics to be both confusing and unfortunate. Surely the most relevant fact about value types is not the implementation detail of how they are allocated, but rather the by-design semantic meaning of “value type”, namely that they are always copied “by value”.
  • Of course, the simplistic statement I described is not even true. As the MSDN documentation correctly notes, value types are allocated on the stack sometimes. For example, the memory for an integer field in a class type is part of the class instance’s memory, which is allocated on the heap.
  • ...3 more annotations...
  • As long as the implementation maintains the semantics guaranteed by the specification, it can choose any strategy it likes for generating efficient code
  • That Windows typically does so, and that this one-meg array is an efficient place to store small amounts of short-lived data is great, but it’s not a requirement that an operating system provide such a structure, or that the jitter use it. The jitter could choose to put every local “on the heap” and live with the performance cost of doing so, as long as the value type semantics were maintained
  • I would only be making that choice if profiling data showed that there was a large, real-world-customer-impacting performance problem directly mitigated by using value types. Absent such data, I’d always make the choice of value type vs reference type based on whether the type is semantically representing a value or semantically a reference to something.
Fabien Cadet

node.js - 5 views

nodejs.org

web development scalability Javascript server-side

shared by Fabien Cadet on 23 Apr 10 - Cached
  • Fabien Cadet on 16 Mar 11
     
    « Node's goal is to provide an easy way to build scalable network programs. In the "hello world" web server example above, many client connections can be handled concurrently. Node tells the operating system (through epoll, kqueue, /dev/poll, or select) that it should be notified when a new connection is made, and then it goes to sleep. If someone new connects, then it executes the callback. Each connection is only a small heap allocation. »
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Download Kaspersky Internet Security 2017 Free - Filefisher.com! - Download Latest Software - www.filefisher.com - 0 views

filefisher.hatenablog.com/...194609

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shared by Filefisher com on 02 Jun 17 - No Cached
  • Filefisher com on 02 Jun 17
     
    Download Kaspersky Internet Security 2017 Free, Download latest version, Antivirus, PC Shield, Direct Link, fast and easy to access, Works, Antivirus has a controlling system that does not allocate malicious programs, malware and any malicious files to achieve your operating system. Antivirus so num…
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David Corking

Alarming Development : JavaScript is good enough | Jan 2009 - 0 views

alarmingdevelopment.org/?p=191

CLI Java javascript

shared by David Corking on 27 Apr 09 - Cached
  • It is impossible to build a hash table in JavaScript that works on arbitrary objects. You would have to manually allocate unique ID’s for every object and include them in the toString. So no collections in JavaScript. Adobe provides a true built-in hashtable in ActionScript 3.
  • Objects can function as sets and maps. Arrays can function as lists and iterators (generate an array when you need an iterator). More that good enough in this context.
  • VB also often compiles down to better MSIL than C#. It is also the only .NET language with first-class edit-and-continue Lisp-like debugging capabilities.
  • ...1 more annotation...
  • a good collection library should support a meta-object protocol with features like rejecting changes. This allows collections to be passed around as references,
  • David Corking on 27 Apr 09
     
    An old-fashioned language war, 2009 style. Visual Basic even gets a mention as "Lisp-like" (for its debugging.)
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Business Intelligence - Media Science International - 0 views

mediascienceinternational.com/...business-intelligence

business intelligence media science international tools programming Development develop web

shared by gpryor3 on 05 Dec 17 - No Cached
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