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There are two scripts: reflector.cgi and EventHandler.pm. Both have -T (Tainting), warning (-w), use strict, use the 3 parameter version of open, all opens and closes have a die or its equivalent. EventHandler.pm is called by reflector.cgi. The Scripts are deployed in the path /afs/slac.stanford.edu/g/www/cgi-wrap-bin/net/shahryar/smokeping/.
Invocation
The reflector script is called by a URL of the form:
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Leaving out the region will assume all regions, leaving out the tier will assume all tiers.
The script uses asynchronous I/O to talk simultaneously with up to 5 landmarks. For the Planetlab landmarks an interpretive script is supplied with the target embedded.
Files
The list of SLAC and Looking Glass landmarks is read from /afs/slac/www/comp/net/wan-mon/tulip>ne sites.txt. the format is space separated tokens:
SNo Site_name PingSite TraceSite Lat Long Reference_Site Alpha, for example (where \ means line broken for viewing)
| Code Block |
|---|
1 1 SLAC,Stanford_US http://www.slac.stanford.edu/cgi-wrap/traceroute.pl?function=ping&target= \ http://www.slac.stanford.edu/cgi-wrap/nph-traceroute.pl?choice=yes&function=trace&target= \ 39.32 32 -122.04 www.slac.stanford.edu edu 73 73 |
The list of PlanetLab landmarks is read from: /afs/slac.stanford.edu/www/comp/net/wan-mon/tulip/TULIP/newsites.txt. It appears as:
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Some spot measures of performance indicate that for 10 pings per target and 86 PlanetLab landmarks for region=northamerica as we vary the number of landmarks accessed simultaneously, the number of parallel requests per landmark, and the timeout for each request the duration is as follows (n.b. there is a timeout of 100 seconds on the complete process, and the default values are ins in boldface in the table below:
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