[rrd-developers] rrdtool 1.3 cairo switch is done

[Dylan Vanderhoof]

Apparently mmap overrules the fadvise functionality.  

When compiled on 2.4.32 w/ --disable-mmap, I get this:

denver ~ # time ./rrdtool fetch test.rrd AVERAGE
ERROR: setting POSIX_FADV_RANDOM on 'test.rrd': Success

real    0m0.016s
user    0m0.010s
sys     0m0.000s

Not surprising, since posix_fadvise() isn't supported on 2.4.X.

Not sure is that's considered a regression, or if --disable-mmap should
be considered unsupported on 2.4.X

-D

> -----Original Message-----
> From: Dylan Vanderhoof 
> Sent: Friday, June 15, 2007 12:32 PM
> To: Bernhard Fischer
> Cc: rrd-developers at lists.oetiker.ch
> Subject: Re: [rrd-developers] rrdtool 1.3 cairo switch is done
> 
> 
> I figured that's why it wasn't the default, but removing it had no
> effect on rrdtool performance, I was just playing with options.
> 
> I'm still seeing approximatly half the performance from trunk 
> than I am
> 1.2.23 + fadvise.  (For fetch.  graph is about 1/3 the speed 
> with trunk)
> I'll without mmap when I get a chance to see if that's part of the
> issue.
> 
> (FWIW, this is on linux 2.4.32, I haven't had a chance to test it on a
> 2.6.X server yet)
> 
> -D
> 
> > -----Original Message-----
> > From: Bernhard Fischer [mailto:rep.dot.nop at gmail.com] 
> > Sent: Friday, June 15, 2007 12:25 PM
> > To: Dylan Vanderhoof
> > Cc: rrd-developers at lists.oetiker.ch
> > Subject: Re: [rrd-developers] rrdtool 1.3 cairo switch is done
> > 
> > 
> > On Fri, Jun 15, 2007 at 10:50:24AM -0700, Dylan Vanderhoof wrote:
> > >Tried this on my test server.  Generated 515 graphs of ~30 
> days each.
> > >Trunk functions fine and the graphs look good, but its 
> substantially
> > >slower than 1.2.23 w/ the fadvise patch.  (trunk compiled 
> > with mmap and
> > >directio)
> > 
> > no. Don't use directio (unless all your rrd are on a RAM backed
> > filesystem)!
> > 
> 
> _______________________________________________
> rrd-developers mailing list
> rrd-developers at lists.oetiker.ch
> https://lists.oetiker.ch/cgi-bin/listinfo/rrd-developers
>