disadvantages of caffeine

where you need to pull data from multiple data sources and then process it.(1) Serial data acquisition, which is our general solution, take PHP as an exampleIf you need 1S for both profile and timeline operations, then serial acquisition requires 2S.(2) Nodejs non-blocking I/O, transmit/listen events to control the execution processNodejs encountered I/O event will create a thread to execute, and then the main thread will continue to execute, therefore, take the action of profile to trigger an

Advantages and disadvantages of multi-process programming from original sourceMulti-process Benefits:Each process is independent of each other, does not affect the stability of the main program, the child process crashes does not matter, by increasing the CPU, you can easily expand performance, can minimize the impact of line Cheng/unlock, greatly improve performance, even if the thread running module algorithm inefficient is not OK; each child proces

ability to specify the version number information in the assembly manifest can be resolved by installing it at the same time.Other:Features: Provides a mechanism for the compiler to use. NET to provide information about certain items in the program. It is very useful in document specification and can be used in conjunction with reflection technology to run programming tasks according to characteristics. Makes it possible to read in a language that is defined in a language.Reflection: The descri

multi-client access, interactivity is strong.(3)The BS architecture does not need to upgrade multiple clients to upgrade the server. Cons: (1) on cross-browser, the BS architecture is not satisfactory. (2) It takes a lot of effort to achieve the degree of CS program.(3) The high cost of design for speed and security is the biggest problem in the BS architecture.(4) C and S interaction is a request-response pattern, which usually requires a refresh of the page, which is not a customer's pleasure

This article mainly introduces the use of JS closures and advantages and disadvantages of the analysis, very detailed use, the need for small partners can refer to. First previous code: ? 1 2 3 4 5 6 7 8 9 10 11 12 13-14 Functions a function A () {var i=0;//functions B Function B () {alert (++i);} return B;}//function c var c = a (); C (); Code Features: 1. The function b is nested inside function A; 2, function a return

on standardized and widely supported technology, do not need to download plug-ins or small programs. Disadvantages: 1, Ajax killed the back button, that is, the browser backward mechanism of the damage. 2, there are certain security issues. 3, the search engine support is weaker. 4, the failure of the program's abnormal mechanism. 5, can not use the URL direct access. The above is a small set to introduce the AJAX working principles and advant

function can pass. If the array adds 1 million elements, it will certainly exceed the allowable size of the function stack, whether push () or unshift () calls. This method is only available for thousands of elements, so it must be limited to a certain range. Note: You can also try splice () and be sure to find him and push (..) /unshift (..) are the same restrictions. One option is to continue using this method, but to use batch processing: Copy Code code as follows: function

the tile. ,,, a frame all the rendering commands after the execution of vertex shader generation triangle, each tile will have a triangle list, this list contains the need to draw inside the tile all triangle. Then the GPU then executes each tile raster and per-fragment based on the Triangle list operationThe advantages of TBR are:There is no need to repeatedly access the frame buffer,depth buffer,stencil buffer when performing raster and per-fragment operation. This is because the GPU can keep

MySQL, of course, will come in contact with MySQL's storage engine, as you will see when you create a new database and create a new datasheet. The MySQL default storage engine is MyISAM, and the other commonly used is innodb. As for what kind of storage engine is better? This question is inconclusive and needs to be measured in terms of your needs and circumstances. Therefore, the concept of the two engines, principles, similarities and differences and their respective advantages and

In the 2011, one of the focuses of the web industry is the development of HTML5. The author also in a lot of webmaster network to see many of this article, but I found that there seems to be very few directly whether the HTML5 standard Web pages can affect the site's traffic and real and optimize the relationship between the article. The author will be in the end of 2011 published about one year to the author of the understanding of HTML5. First we need to know the advantages and

Still remember before the study of IFRAME label, think the role is not very big, and then some time ago undoubtedly met in a place, unexpectedly also and SEO on the relationship, after a detailed understanding, indeed ifram tag in the SEO has the disadvantage is also advantageous! 　　 First, let's take a look at what is the iframe tag? When you use the Ifram tag in a Web page, a new document frame is created inside the page, such as a location within a page using the Ifram invocatio

slower than handwritten assembly language, and necessarily so. High-level language advocates say such a small loss of performance is worthwhile because COBOL and FORTRAN programs are easier to write and maintain. Advantage: Organizing large programs is much better than C language. Very good support for object-oriented mechanism. Common data structures, such as lists of linked lists and scalable arrays, reduce the burden of handling low-level details. Disa