简单说，Buffer的核心作用是用来缓冲，缓和冲击。比如你每秒要写100次硬盘，对系统冲击很大，浪费了大量时间在忙着处理开始写和结束写这两件事嘛。用个buffer暂存起来，变成每10秒写一次硬盘，对系统的冲击就很小，写入效率高了，日子过得爽了。

Here, the buffer array is used to store the data read by read(2) until it's written; then the buffer is re-used. There are more complicated buffer schemes used, for example a circular buffer, where some finite number of buffers are used, one after the next; once the buffers are all full, the index "wraps around" so that the first one is re-used.

Buffer is an area of memory used to temporarily store data while it's being moved from one place to another. Cache is a temporary storage area used to store frequently accessed data for rapid access. Once the data is stored in the cache, future use can be done by accessing the cached copy rather than re-fetching the original data, so that the ...

May 17, 2012 · Since buffer is a pointer (not an array), the sizeof operator returns the size of a pointer, not the size of the buffer it points to. There is no standard way to determine this size, so you have to do the bookkeeping yourself (i.e. remember how much you allocated.)

Aug 10, 2010 · Once the device is ready, the another buffer may take the current buffer's place and the consuming device will process the data in the first buffer. In this manner, the slower device receives the data at a moderated pace rather …

Jan 11, 2013 · As Buffer: <Buffer 7b 0a 20 20 20 20 22 74 79 70 65 22 3a 20 22 6d 6f 64 75 6c 65 22 0a 7d> As Object: { type: 'module' } As String: { "type": "module" } Share Improve this answer

Nov 19, 2009 · the way you use the explicitly passed size of the buffer may vary. Your suggestion of decreasing by the number of character added to the buffer is workable. Another approach is to calculate, before anything is added maximum insertion point in the buffer and to check that this pointer will remain smaller than the current insertion pointer. –

Sep 30, 2016 · It means the Auth.IdentityTokenXChangeData.Deserialize method creates a new MemoryStream instance with a null buffer argument. This method seems specific to your code / environment (there is an Auth.IdentityModule in your site), so you need to take a look at it.

Jul 29, 2020 · I have a look at the Node.js Buffer documentation and I don't understand the difference between Buffer.slice and Buffer.subarray. Both point to "the same memory as the original". But no one seems not to be the alias of the other …

Nov 14, 2011 · The stream manages the lifetime of the buffer and the buffer is what provides actual read and write capabilities to a file. The stream's formatting operators ultimately access the stream buffer's unformatted I/O functions, so you only ever have to use the stream's I/O functions, and don't need to touch the buffer's I/O functions directly.