Alert Analysis of ABwE Raw capacity data

The data analyzed for alerts is the ABwE exponentially weighted moving average of available bandwidth estimate data for about 40 hosts in 12 countries in N. America (US and Canada), Europe (.ch, .cz, .de, .fr, .it, .nl, .uk) and Asia (.jp, .pk,. su) with bottleneck capacities from 512kbps to 1000Mbps. The data points are measured from SLAC at ~ 1 minute intervals. The Event analysis uses a modified "plateau" algorithm ( ppt, pdf) developed from Automated Event Detection for Active Measurement Systems McGregor A. J and Braun H-W.

Connie Logg and Les Cottrell
Program Logic Manual | Perl pseudo code | Examples of alerts

This page was created from the averaged-new ABwE data on Tue Jun 29 18:21:47 2004 for cottrell on nettest1 by: version 1.3, 6/8/04 of runperiod using threshold=33, statistical_limit = -0.1 and writing data to /nfs/slac/g/net/iepm-bw/bandwidth-tests/eventanalysis/nikhef-4. The data goes back 8 days to 6/20/2004 18:00 and includes 1 remote hosts.
EVENT SUMMARY

node = node1.nikhef.nl
Analyzed: Tue Jun 29 18:21:50 2004 starttime = 6/20/2004 18:00; endtime = 06/29/04 00:00; change threshold = 33, statistical_limit = -0.1, data_column=4
The number of standard deviations that a data value must lie outside the mean to be evaluated as a trigger value is defined by the sensitivity = 2
maximum history buffer size = 307 (1440 mins), length of trigger buff 12 (60 mins)

line color = magenta

drop in bandwidth greater than 33 %, the statistical_limit = -0.1

Bandwidth Data Event Info

NODENAME	lastmean	laststdev	trigmean	trigstdev	%change last-trig	F1	%change lasttrig-trig	date&time	trigger buffer
node1.nikhef.nl	1000	0	659.22	273.1441	34.0780	1.76	0	06/25/04 15:59:32 778.500	(810.900,714.000,753.200,770.200,813.400,802.000,114.900,802.900,104.800,786.600,778.500)
node1.nikhef.nl	987.34	80.7157	633.01	285.5772	35.8873	1.69	0	06/25/04 17:17:30 105.500	(818.900,762.200,770.200,729.800,107.700,786.300,742.300,755.800,803.200,753.200,806.800,808.400,111.800,105.500)

triggers = 5; aborted triggers = 0; alerts = 2; datastart=1087779746; dataend=1088492365; duration=712619 secs; avg. data separation= 4.68 mins; history_buffer_length=307( 23.9 hours); trigger_buffer_length=12( 0.9 hours)