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The IEPM-BW ping data will be read from the IEPM-BW Measurement Archive (MA) by a web services interface. Yee will need to provide the specifications for accessing this MAAsif has put together a first cut that gets the data and does a simple HTML table display, from inside SLAC it can be viewed via http://net-desk1/traceanal/ping_analysis.pl?hours=12. Asif will supply information on how to access the first cut code. It should be possible to specify the time interval for which the data is required, as well as the remote host. It should also be possible to specify all available remote hosts. The data returned will contain at least the name of the remote host, the time stamp of the measurement, and the number of pings sent and received. It should also be possible for the data to contain RTT.
The simplest display will have the name of the remote host in the first and last columns. Each of the other columns will be for different time stamps (i.e. 6 columns/hour if the measurements are taken at 10 minute intervals). Each row (apart from the header and footer which contain the time stamps) is for a remote host.
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For RTTs (selected by means of a check box) the colors will indicate the RTTs. Red for > 550ms, and a gradation of colors (e.g. light red, magenta, pink, orange, yellow, yellow-green, green, cyan) to blue for < 10ms RTT (we will probably need to experiment with this).
The table should be as compact as possible in order to provide visualization of as many nodes and timestamps as possible. One could imagine a cell being one pixel wide so that one could display several days worth of measurements in a 1280 pixel wide screen. In such a case labeling the timestamp for every measurement would be a challenge so maybe one would only label the time every 8 hours or so.
Mouseover a hostname will provide details on the host (Connie and or Jerrod can make suggestions for what should be displayed), clicking on the host would provide access to the IEPM-BW time series measurements, e.g. to http://www.slac.stanford.edu/comp/net/iepm-bw.slac.stanford.edu/slac_wan_bw_tests.html#iepm-bw.bnl.org or to http://www.slac.stanford.edu/comp/net/iepm-bw.slac.stanford.edu/toolrpts/html/iepm-bw.bnl.org.html, this will need to be parameterized for the monitoring host.
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The help should give a legend of the meanings for the colors. There might also be a link to relevant traceroutes.
Suggestions for improvements
- It needs a help entry that provides help (e.g. what the colors mean, how to use various features) when one does a mouseover.
- It needs a checkbox to select to display RTT rather than losses, or an alternate might be to try two colors per entry one for losses the other for RTT.
- It needs the node names displayed in the right hand column.
- It needs mouseover and clicking on hostname.
- Need to experiment with more compact format.
Requirements:
The student will need to be or become proficient in Unix/Linux, perl, CGI scripts and using web services. Some knowleedge of databases is desirable. The code will need to be production quality. Guidelines on how to write perl will be provided. The student will need to apply for and get a Unix account at SLAC and will be provided access to the relevant computers, files and databases.