[rrd-users] rrdtutorial not working

[Tobias Oetiker]

Hi Dan,

yes except that I don't think MS_SYNC is ideal it should rather be
MS_ASYNC and have the OS decide when to sync ... or would this not
suffice ?

otoh, things will only work well once the architecture independent
rrd file format is implemented ...

cheers
tobi


> Tjerk.Kusters at imtech.nl wrote:
> > I read that there can be a problem when using mmap/munmap on NFS.
> > On http://nfs.sourceforge.net/ there is a part over mmap and NFS. According
> > to the msync man page  you should use msync before a munmap.
> >
> > I have add 2 msync function call in rrd_update.c and it looks to help.
> >
> > #ifdef HAVE_MMAP
> >                 msync(rrd_mmaped_file, rrd_filesize,MS_SYNC);
> >                 munmap(rrd_mmaped_file, rrd_filesize);
> > #endif
> >
> > Is there a reason that you don't use a msync?
>
> This is a very good point, and what seems like a simple solution.
>
> Support for working with rrds on an nfs mount would be a great thing in
> several situations, especially if you have multiple collectors and/or
> multiple front-end hosts all needing to access the same set of rrds.
>
> What are your thoughts Tobi?
>
> Dan
>
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Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
http://it.oetiker.ch tobi at oetiker.ch ++41 62 213 9902