Alert Analysis of ABwE Average available bandwidth 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 developed from Automated Event Detection for Active Measurement Systems McGregor A. J and Braun H-W. The history buffer duration we used in the plateau algorithm was 1800 points (the interval between points was 1 minute) or 10 hours, and the trigger buffer was points or 1 hour.

Connie Logg and Les Cottrell
Program Logic Manual
Perl pseudo code
This page was created from the averaged-new ABwE data on Tue Jun 22 11:06:41 2004 for iepm on nettest1 by: version 1.3, 6/8/04 of runperiod.les using threshold=40, statistical_limit = 2 and writing data to /nfs/slac/g/net/iepm-bw/bandwidth-tests/eventanalysis/caltech-3. The data goes back 3 days to 4/8/2004 18:00 and includes 1 remote hosts.
EVENT SUMMARY

node = node1.cacr.caltech.edu
Analyzed: Tue Jun 22 11:06:44 2004 starttime = 4/8/2004 18:00; endtime = 04/12/04 00:00; change threshold = 40, statistical_limit = 2, data_column=5
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 = 646 (1800 mins), length of trigger buff 14 (40 mins)

line color = magenta

drop in bandwidth greater than 40 %, the statistical_limit = 2

Bandwidth Data Event Info

NODENAME	lastmean	laststdev	trigmean	trigstdev	%change last-trig	F1	%change lasttrig-trig	date&time	trigger buffer
node1.cacr.caltech.edu	497.56	129.9798	166.06	32.4485	66.6251	3.50	0	04/09/04 13:33:42 115.619	(227.628,201.464,187.774,175.898,174.788,169.450,176.252,179.844,158.492,142.278,129.576,119.770,115.619)
node1.cacr.caltech.edu	506.51	123.7823	176.06	37.6961	65.2406	3.61	0	04/09/04 21:30:34 132.986	(246.138,218.472,208.471,197.285,186.592,187.883,181.241,173.585,166.207,142.296,121.537,126.136,132.986)
node1.cacr.caltech.edu	529.5	124.6345	185.78	48.1999	64.9141	3.64	0	04/10/04 13:37:47 269.729	(251.895,235.846,223.749,190.907,184.336,169.181,159.569,158.344,135.192,118.948,124.971,192.475,269.729)

triggers = 3; aborted triggers = 0; alerts = 3; datastart=1081472531; dataend=1081753081; duration=280550 secs; avg. data separation= 2.78 mins; history_buffer_length=646( 30.0 hours); trigger_buffer_length=14( 0.6 hours)