[Bug stdio/4099] Overly agressive caching by stream i/o functions.

["neleai at seznam dot cz" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=4099

--- Comment #3 from Ondrej Bilka <neleai at seznam dot cz> ---
On Sat, May 25, 2013 at 12:55:48PM +0000, bugdal at aerifal dot cx wrote:
> http://sourceware.org/bugzilla/show_bug.cgi?id=4099
> 
> Rich Felker <bugdal at aerifal dot cx> changed:
> 
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>                  CC|                            |bugdal at aerifal dot cx
> 
> --- Comment #2 from Rich Felker <bugdal at aerifal dot cx> ---
> mmap is not the solution; mmap-by-default is not an option because it will
> SIGBUS under circumstances you cannot control. The solution is just decoupling
> cache size from st_blksize, either never using st_blksize at all (and avoiding
> the expensive fstat syscall at open time if possible) or only using it when
> it's less than a reasonable upper bound like 8-64k.
>
For reading my comment was relevant unless you could find how produce
SIGBUS for fopen(foo,"rm"). 

Writing is different issue, a good upper bound looks ok (But I would
prefer to flush once per 100ms or so.)

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