perfsonar development work

["Luchesar V. ILIEV" <>]

Dear Colleagues,

I'd like to share just a couple of hints on the redesigned SmokePing MDM
monitoring site that I told you about yesterday. Perhaps most of you
have already figured out these by themselves, but I hope it won't hurt
to share them here anyway. Once again, SmokePing is available here:

http://perfsonar.acad.bg/smokeping

As you can see, each service point now has its own section with three
different statistics: IP (Layer 3) connectivity, HTTP connectivity, and
service connectivity. The IP connectivity is monitored through ICMP Echo
Request/Replies, HTTP is monitored through simple HTTP GETs via the
modified EchoPing probe, and the service connectivity is monitored with
psping, which I presented to you yesterday.

The interesting thing in these statistics that I'd like to bring your
attention upon is the summary display for each section. There, you have
three small graphs -- one for each type of monitoring -- for the last 24
hours. First of all, you can easily see here the different fluctuations
in the measured delay between the three different monitorings. This, of
course, is pretty obvious, but what might have been attracting attention
 a bit less, are the numeric data below each graph.

There are the average median RTT for each type of monitoring, the latest
measured one, as well as the average packet loss. Now, the interesting
thing is that having this information on a single page allows you to see
exactly how much overhead each level brings in, or -- in other words --
what is the delay for each level alone, subtracting the delay from the
lower levels. The same goes for the packet loss, where you can estimate
conveniently what amount of the loss is "generated" at each level.

In my opinion this is indeed very useful, and I have to give the credit
to Nicolas, who came up with this nice idea. :)

Best regards,
Luchesar

P.S. Yesterday I incorrectly stated that the SVN we are preparing might
host as well the PerfsonarUI sources. PerfsonarUI is and will continue
to be available at the perfSONAR's SVN here:

https://svn.perfsonar.net/svn/perfsonar/branches/perfsonarui

Actually, we are considering whether psping would better be hosted there
as well. In any case, I'll let you know as soon as there's something set
up firmly.

-- 
Luchesar V. ILIEV
Assistant Professor
IPP-BAS/DDSN
ISTF/BREN

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