Today Simon Hobson wrote: > Munroe Sollog wrote: > >It looks like I'm running up against an RPN limitation. I'm trying to add > >~1600 values, but the > >rrdgraph function dies with: > > > >invalid rpn expression in: <spits out the first 4081 chars for the string> > > > >My full CDEF function is ~20379 chars long > > > >Is this a known bug? Any suggestions on how to work around it? > > Three things come to mind ... > > 1) Can you split the expression into smaller chunks ? > > 2) How are you doing the add ? > If you do a,b,c, ...,+,+,+ then that's going to need an awful lot of stack to > execute. While a,b,+,c,+,... shouldn't. But I don't know how RRD processes > the expression - logically it should just work left-right adding things to > the stack or executing operators as it find them. > > 3) How are you passing the instructions ? Could you be hitting an > OS limitation - eg shells often have a limit on the length of > command+paramters that will fit in a buffer. > > > I suspect it's not a specific limit in RRD, just a limit in > <something in teh system>. I have graphs with 510 graph elements > and 1020 legend items - so RRD can certainly handle large > definitions. What I don't have is any particualrly large RPN > expressions.
note that rrdtool 1.4.8 is much faster (and stable) in handling experssions with hundreds and thousands of elements! cheers tobi -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland http://it.oetiker.ch [email protected] ++41 62 775 9902 / sb: -9900 _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
