Re: [MLUG] Linux time command -- "kernel mode" and "user mode"

[Stephen Montgomery-Smith <EMAIL:PROTECTED>]

Matt Klaric wrote:
> On 11/3/06, *Stephen Montgomery-Smith* <EMAIL:PROTECTED 
> <mailto:EMAIL:PROTECTED>> wrote:
>
>     The caching you talk of does take place, but actually it takes place in
>     just about any decent file-io implementation.  For example, 'printf' in
>     C has caching.  It only writes the info to the files once it has
>     collected about 128 bytes to write out.  The only function that has the
>     possibility to write a byte at a time is the core function 'write' (or
>     printf if you first apply the function 'setbuf' which allows you to tune
>     the caching behavior).
>
>
> The behavior of printf (and other higher level output functions) is 
> actually called buffering.  Caching describes the process of holding 
> recently and/or frequently accessed information for fast access in case 
> it needs to be retrieved for additional accesses.  Buffering is the 
> processes which was described--holding data in a buffer until the buffer 
> is full or it is manually flushed.  While both of these allow for more 
> efficient I/O, there is a distinction. 
>
> --matt

Yes.  You are correct.  Sorry.

(Although buffering is all Mike's program needs to make it work 
efficiently.)

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