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dd: How to calculate optimal blocksize? [closed]

...e Eug-Lug mailing list, circa 2002, recommending a block size of 64K here: http://www.mail-archive.com/eug-lug@efn.org/msg12073.html For determining THE optimal output block size, I've written the following script that tests writing a 128M test file with dd at a range of different block sizes, from...
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高并发服务端分布式系统设计概要 - C/C++ - 清泛网 - 专注C/C++及内核技术

高并发服务端分布式系统设计概要张峻崇 原创主页:http: ccixx.com 昵称:Jone Zhang我们今天要设计的系统目标很明确,针对千万级以上PV的网站,设计一套用于后台的高...张峻崇 原创 主页:http://ccixx.com 昵称:Jone Zhang 我们今...
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Is SQL or even TSQL Turing Complete?

... https://web.archive.org/web/20110807062050/http://channel9.msdn.com/forums/TechOff/431432-SQL-Turing-Completeness-question Is a discussion of this topic. A quote: SQL as such (i.e. the SQL92 standard) is not turing compl...
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How to sort in-place using the merge sort algorithm?

..., this paper describes a couple of variants of in-place merge sort (PDF): http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.22.5514&rep=rep1&type=pdf In-place sorting with fewer moves Jyrki Katajainen, Tomi A. Pasanen It is shown that an array of n elements can be sorted usi...
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What kind of virtual machine is BEAM (the Erlang VM)?

... I assume that you've been reading http://en.wikipedia.org/wiki/Virtual_machine - under that terminology, BEAM is a "process virtual machine", just like the JVM. share | ...
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ruby on rails f.select options with custom attributes

...sted about finding this not in the docs, but by reading the rails source. https://web.archive.org/web/20130128223827/http://www.pogodan.com/blog/2011/02/24/custom-html-attributes-in-options-for-select share | ...
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Types in MySQL: BigInt(20) vs Int(20)

... See http://dev.mysql.com/doc/refman/8.0/en/numeric-types.html INT is a four-byte signed integer. BIGINT is an eight-byte signed integer. They each accept no more and no fewer values than can be stored in their respective n...
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What causes and what are the differences between NoClassDefFoundError and ClassNotFoundException?

...r a class belongs to in a local path, you can use a utility like jarscan ( http://www.inetfeedback.com/jarscan/ ). You just specify the class you'd like to locate and the root directory path where you'd like it to start searching for the class in jars and zip files. ...
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How to use a WSDL

...ystem.Web.Services.WebServiceBindingAttribute(Name="MyService", Namespace="http://myservice.com/myservice")] public partial class MyService : System.Web.Services.Protocols.SoapHttpClientProtocol { ... } In your client-side, Web-service-consuming code: instantiate MyService. set its Url prope...
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How do I log ALL exceptions globally for a C# MVC4 WebAPI app?

... In the sample code you have shown you are only handling exception of type HttpException which is obviously not the case with the Convert.ToInt32("a") code. So make sure that you log and handle all exceptions in there: protected void Application_Error() { Exception unhandledException = Server.G...