how to flush out cache.?

[Julian Elischer]

On Wed, 21 Apr 2004, Stephan Uphoff wrote:

> 
> mmap() and msync(..MS_INVALIDATE..) should work.

hmmm that is rather interesting..
I wonder if it would work....
Maybe a vm guru could confirm this.. (under 4.x)

> 
> 	Stephan
> 
> > 
> > Ok so I have an application where I need to 
> > reread a file I have just written to ensure that it went to disk
> > correctly..
> > 
> > Other than reading a few GB of data, is there a way to flush
> > out the cache copy of a file I've written?
> > 
> > possibilities include:
> > 
> > a file flag saying "don't keep a copy after it's written to disk"?
> > a syscall discard_cached_blocks(fd);
> > 
> > 
> > ?
> > any other suggestions?
> > 
> > julian
> > (BTW this would be for 4.x initially)
> > 
> > 
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> 
> 
>