Hi everyone,
Le 7 oct. 05 à 13:10, Javier Szyszlican a écrit :
> We calculate the 95th percentile on the fly, so its slow.
>
> Javier
>
> Cody Holland wrote:
>> We're running JFFNMS 0.8.2, and everything works great! Except,
>> 95th percentile is very, very slow. I'm running Cacti on the same
>> box and it's 95th percentile works fine and fast. I like JFFNMS,
>> and all the features it brings to the table, but for some of the
>> services that my company provides I need 95th percentile. It's
>> always been like this and the only explanation I've ever been given
>> is that it has to do with RRDTool. Now, again Cacti's 95th
>> percentile seems to be working just fine and they too use RRDTool.
>> Does anyone have any insight on this issue?
We had the same problem. And it was very critical for us, so I had to
spend some time on it.
I found that on the 60th line of the file "lib/api.rrdtool.inc.php",
the parameter "$use_pipe" is used to choose how to call the rrdtool
command : a pipe or an exec :
if ($use_pipe)
list ($ret1, $ret2) = rrd_pipe($method." '".$file."' ".$aux);
else
exec($command,$ret1,$ret2);
If we use the pipe way, it is so slow that it took more than 10
minutes to show a graph with a percentile. With the exec call, no
problem.
JFFNMS use this condition to determine if it should use a pipe or not
(same file) :
if (!isset($GLOBALS["rrdtool_not_use_pipe"]) &&
function_exists("proc_open") && (strlen($command) < 10000))
$use_pipe = true;
But I wasn't able to find the string "rrdtool_not_use_pipe" elsewhere
in the code of JFFNMS.
So, temporarly, I just modified the file to add this one and only line :
// 2008-03-04/Nsia/SNa - Without this line, percentile calculation
is incredibly slow.
$use_pipe = false;
if ($use_pipe)
list ($ret1, $ret2) = rrd_pipe($method." '".$file."' ".$aux);
else
exec($command,$ret1,$ret2);
Hope this helps...
--
Sébastien Namèche
Société Netensia
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