[rrd-users] getting MAX,

permalink · #1 (**permalink**) 02-13-2008

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Hello all
=20
I have some existing rrdfile with some data in them.
=20
I was reading about the VDEF capabilities of the rrdgraph
command.
=20
I am using the c library functions to manipulate the rrd files.
=20
I want the MAX and LAST from a graph, but I don't want the graph.
=20
At the command line I would do:
=20
rrdtool graph xy.png -aPNG
DEF:curclientconns=3D/var/rrd/connections:curclientconns:AVERAGE
VDEF:connsmax=3Dcurclientconns,MAXIMUM =
VDEF:connslast=3Dcurclientconns,LAST
PRINT:connslast:"last=3D%12.0lf" PRINT:connsmax:"max=3D%12.0lf"
=20
This prints to stdout.
=20
If I am calling rrd_graph() C function, how do I get this data?=20
=20
=20
Is there a better way to do this? I m very open to suggestions, but I
have to stick with the C library calls.
=20
Ok, one more question:
I dont see any API docs for theC library on the web site. Are there any?
=20
Thanks again

--
Jack Tavares
Reminder: I am at GMT+2, 10 hours AHEAD of Seattle.
My workweek is Sunday-Thursday.
Email sent to me Thursday afternoon (PST) may not be viewed until Sunday
morning (GMT+2).
=20
=20

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dus-ascii">
<META content=3D"MSHTML 6.00.3790.4134" name=3DGENERATOR></HEAD>
<BODY>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial size=3D2>Hello=20
all</FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial size=3D2>I have =
some existing=20
rrdfile with some data in them.</FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial size=3D2>I was =
reading =20
about the VDEF capabilities of the rrdgraph</FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2>command.</FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial size=3D2>I am =
using the c=20
library functions to manipulate the rrd files.</FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial size=3D2>I want =
the MAX and=20
LAST from a graph, but I don't want the graph.</FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial size=3D2>At the =
command line=20
I would do:</FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D820021515-12022008></SPAN><SPAN =
class=3D820021515-12022008><FONT=20
face=3DArial size=3D2>rrdtool graph xy.png -aPNG=20
DEF:curclientconns=3D/var/rrd/connections:curclientconns:AVERAGE=20
VDEF:connsmax=3Dcurclientconns,MAXIMUM =
VDEF:connslast=3Dcurclientconns,LAST=20
PRINT:connslast:"last=3D%12.0lf" =
PRINT:connsmax:"max=3D%12.0lf"</FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial size=3D2>This =
prints to=20
stdout.</FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial size=3D2>If I =
am calling=20
rrd_graph() C function, how do I get this data? </FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial size=3D2>Is =
there a better=20
way to do this? I m very open to suggestions, but I have to stick with=20
the C library calls.</FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial size=3D2>Ok, =
one more=20
question:</FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial size=3D2>I dont =
see any API=20
docs for theC library on the web site. Are there =
any?</FONT></SPAN></DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D820021515-12022008><FONT face=3DArial size=3D2>Thanks =
again</DIV>
<DIV><BR></DIV></FONT></SPAN>
<DIV><FONT face=3DArial><FONT size=3D2><SPAN=20
class=3D820021515-12022008></SPAN></FONT></FONT></DIV>
<DIV align=3Dleft>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial size=3D2>--</FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial size=3D2>Jack =
Tavares</FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial size=3D2>Reminder: I am =
at GMT+2, 10=20
hours AHEAD of Seattle.</FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial size=3D2>My workweek is=20
Sunday-Thursday.</FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial size=3D2>Email sent to me =
Thursday=20
afternoon (PST) may not be viewed until Sunday morning=20
(GMT+2).</FONT></DIV></DIV>
<DIV align=3Dleft><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV> </DIV></BODY></HTML>

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