[rrd-users] RRDs::update slowness

[Chris Snell]

Hi All,

I'm having a strange problem and I'm wondering if anyone else has run 
into it.  I'm noticing a lot of slowness when updating an RRD file with 
many DS'es under Solaris.  Updates are taking as long as 10 seconds on 
this (unloaded) Enterprise 250 machine.  I've never had this problem 
before but then again, I've never tried to use 17 DS's in one RRD file. 
 Here's my rrdcreate call:

        RRDs::create ("$rrd_file", "--step", "60", "--start", 
"$one_month_ago",
        "DS:iorps:GAUGE:120:0:U",
        "DS:la5:GAUGE:120:0:U",
        "DS:nrks:GAUGE:120:0:U",
        "DS:nc:GAUGE:120:0:U",
        "DS:iowks:GAUGE:120:0:U",
        "DS:cpuu:GAUGE:120:0:U",
        "DS:cpuw:GAUGE:120:0:U",
        "DS:np:GAUGE:120:0:U",
        "DS:iowps:GAUGE:120:0:U",
        "DS:la15:GAUGE:120:0:U",
        "DS:nwks:GAUGE:120:0:U",
        "DS:iorks:GAUGE:120:0:U",
        "DS:cpui:GAUGE:120:0:U",
        "DS:cpuk:GAUGE:120:0:U",
        "DS:la1:GAUGE:120:0:U",
        "DS:fm:GAUGE:120:0:U",
        "DS:sr:GAUGE:120:0:U",
        "RRA:AVERAGE:0.5:1:3600",
        "RRA:AVERAGE:0.5:12:3600",
        "RRA:AVERAGE:0.5:60:7200",
        "RRA:MIN:0.5:1:3600",
        "RRA:MIN:0.5:12:3600",
        "RRA:MIN:0.5:60:7200",
        "RRA:MAX:0.5:1:3600",
        "RRA:MAX:0.5:12:3600",
        "RRA:MAX:0.5:60:7200");
        my $ERR=RRDs::error;
        print "ERROR while creating $rrd_file: $ERR\n" if $ERR;

While the call to RRDs::update is running, I see the following with 
truss(1):

lseek(4, 4244368, SEEK_SET)                     = 4244368
write(4, "7FFFFFFFFFFFFFFF7FFFFFFF".., 8192)    = 8192
write(4, "7FFFFFFFFFFFFFFF7FFFFFFF".., 8192)    = 8192
write(4, "7FFFFFFFFFFFFFFF7FFFFFFF".., 8192)    = 8192
write(4, "7FFFFFFFFFFFFFFF7FFFFFFF".., 8192)    = 8192
[ the write() call repeats about 100x before another lseek() call is 
made ... ]

Any ideas?

thanks,

Chris


--
Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:rrd-users-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/rrd-users
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi