Larger Compilations / Speed

[F. Schaefer]

Joe Buck <jbuck@synopsys.com> wrote:

>On Wed, Aug 13, 2003 at 10:14:12AM -0400, Andrew Pinski wrote:
>> The OS should cache the files for execution (on Darwin it does)
>> so it looks more like an OS problem rather than a gcc problem.
>
>On Linux and every other modern Unix-like OS, the files are also cached
>in memory.
>

Well, I admit that it's been some years since I studied some UNIX internals. But, if I remember it right, the files are kept in a buffer-cache in RAM. Then when requested they are copied into the process data region. It is this copying, of course, that is a little slow. Not to speak about what is done to the cache by the copying of this large amount of data. 




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