[rrd-developers] implementing portable format - change format?

[Sfiligoi Igor]

kevin brintnall wrote:
> On Mon, Nov 17, 2008 at 12:14:04PM -0600, Sfiligoi Igor wrote:
>> Running a simple open/update/close loop, I get ~9 updates per second:
> 
> Igor, what kind of rates can you get with RRD update on the same hardware?
> 

I get ~350 updates per second using plain rrdtool update invocations:
bash-3.2$ rrdtool create t1.rrd DS:val:GAUGE:300:0:200000 RRA:LAST:0.9:1:100
bash-3.2$ date; for ((i=0; $i<10000; i++)); do rrdtool update t1.rrd
N:$RANDOM; done; date
Mon Nov 17 12:40:20 CST 2008
Mon Nov 17 12:40:48 CST 2008
bash-3.2$ date; for ((i=0; $i<10000; i++)); do rrdtool update t1.rrd
N:$RANDOM; done; date
Mon Nov 17 12:41:00 CST 2008
Mon Nov 17 12:41:28 CST 2008

bash-3.2$ rrdtool create t2.rrd DS:val:GAUGE:300:0:200000
RRA:LAST:0.9:1:2000
bash-3.2$ date; for ((i=0; $i<10000; i++)); do rrdtool update t2.rrd
N:$RANDOM; done; date
Mon Nov 17 12:41:35 CST 2008
Mon Nov 17 12:42:03 CST 2008
bash-3.2$ date; for ((i=0; $i<10000; i++)); do rrdtool update t2.rrd
N:$RANDOM; done; date
Mon Nov 17 12:42:08 CST 2008
Mon Nov 17 12:42:37 CST 2008


Indeed, sqlite approach seems to be viable only when grouping together
many updates into a singular transaction:
   1 row update/transaction  =    ~9Hz
  10 row updates/transaction =   ~85Hz
 100 row updates/transaction =  ~800Hz

Igor