[rrd-users] rrdtool update()

[Emily Chouinard]

So I'm stuck my code compiles and I my files seems to update only if I 
cat usr.rrd I get endless gibberish, is that good? Also I can display my 
example.png but it seems like there was no data inputed or something 
because nothing shows up in the graph, please someone help me, I am so 
close to finishing this but yet so far, thanks!
 E Chouin

Emily Chouinard wrote:
> Alright so I'm new to rrdtool and I was wondering how exactly you define 
> the rrdtool update function, I am using it in my code, but I'm not sure 
> what the value should be, I understand the time_t:value is what I need 
> but what is time_t and where do I find the value?  here's a copy of my 
> code, if someone can take a look at it and let me know what direction to 
> head in I would really appreciate it.
> import rrdtool
> import os
> import time
>
>
> interval = 2
> interval = str(interval)
> interval_mins = float(interval) / 60
> heartbeat = str(int(interval) * 2)
>
> rrdtool.create('usr.rrd',
>          'DS:usr_info:DERIVE:%s:U:U' % heartbeat,
>       'RRA:AVERAGE:0.5:1:%s' % int(4000 / interval_mins),
>      'RRA:AVERAGE:0.5:%d:800' % int(30 / interval_mins),
>      'RRA:AVERAGE:0.5:%d:800' % int(120 / interval_mins),
>            'RRA:AVERAGE:0.5:%d:800' % int(1440 / interval_mins))
> rrdtool.create('sys.rrd',
>      'DS:sys_info:DERIVE:%s:U:U' % heartbeat,
>         'RRA:AVERAGE:0.5:1:%s' % int(4000 / interval_mins),
>       'RRA:AVERAGE:0.5:%d:800' % int(30 / interval_mins),
>     'RRA:AVERAGE:0.5:%d:800' % int(120 / interval_mins),
>         'RRA:AVERAGE:0.5:%d:800' % int(1440 / interval_mins))   
> rrdtool.create('idle.rrd',
>         'DS:idle_info:DERIVE:%s:U:U' % heartbeat,
>         'RRA:AVERAGE:0.5:1:%s' % int(4000 / interval_mins),
>         'RRA:AVERAGE:0.5:%d:800' % int(30 / interval_mins),
>         'RRA:AVERAGE:0.5:%d:800' % int(120 / interval_mins),
>         'RRA:AVERAGE:0.5:%d:800' % int(1440 / interval_mins))
> while True:
>     infile= open('/proc/stat', 'r')
>     #for x in range(0,1): #Reads first line only
>     line = infile.readline()
>     if line.startswith('cpu'): #Check to make sure in 1st line
>     info = line.split()    #Returns a list of the words in the string
>     usr_info = info[1]     #Index the three aspects of CPU Usuage
>     rrdtool.update('usr.rrd','N:1')           
>     sys_info = info[3]
>     rrdtool.update('sys.rrd','N:1')
>     idle_info = info[4]
>     rrdtool.update('idle.rrd','N:1')      #str() because Python needs to 
> have a string
>         print  usr_info, sys_info, idle_info #Print out so you can see 
> what's happening
>     time.sleep(5)
>
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