If there is an API for setting the amount of resources in RELOAD
implementations, would this be done per usage or overall for RELOAD. That would
affect what and how we report stuff in the diagnostics.
I think the comon CPU stats are still useful along with which we could report
some number set up by the user that specifies the resources.
Different topology plugin apps could then use different heuristics to perform
neighbor selection based on this information depending on what they are aimed
at. I agree that what is proposed here should both help debug an overlay as
well as help in populating some metrics data which can then be used by topology
plugins.
On a related note, would metrics collected using a Chord topology plugin be
useful to a Pastry topology plugin. Due to the use of nodeids it may be hard to
reuse this information across topology plugins.
Thanks,
Saumitra
From: Roni Even [mailto:ron(_dot_)even(_dot_)tlv(_at_)gmail(_dot_)com]
Sent: Thursday, November 13, 2008 6:35 AM
To: 'Song Haibin'; Das, Saumitra; p2psip(_at_)ietf(_dot_)org
Cc: ietf(_at_)ietf(_dot_)org
Subject: RE: [P2PSIP] How to describe the processing power
Song Haibin,
Your response " It is also useful in selecting peer for a neighbor table entry,
when there are multiple choices existing and for the overlay management to
collect the overall status of the overlay." does also address Bruce question.
My view is that the pure CPU power or CPU current usage are good but the
question is if they are relevant for the decision since the user may limit the
amount of resources it wants to allocate for the p2p application. This may be
based on percentage from the link or number of connections.
Roni Even
From: p2psip-bounces(_at_)ietf(_dot_)org
[mailto:p2psip-bounces(_at_)ietf(_dot_)org] On Behalf Of Song Haibin
Sent: Thursday, November 13, 2008 5:07 AM
To: 'Das, Saumitra'; p2psip(_at_)ietf(_dot_)org
Cc: ietf(_at_)ietf(_dot_)org
Subject: Re: [P2PSIP] How to describe the processing power
Dear Das,
See inline.
________________________________
From: p2psip-bounces(_at_)ietf(_dot_)org
[mailto:p2psip-bounces(_at_)ietf(_dot_)org] On Behalf Of Das, Saumitra
Sent: Wednesday, November 12, 2008 5:12 PM
To: p2psip(_at_)ietf(_dot_)org
Cc: ietf(_at_)ietf(_dot_)org
Subject: Re: [P2PSIP] How to describe the processing power
Dear Song,
Processing power would be more informational in terms of CPU load. A good
example of what would be useful would be to look at the comon monitoring tool
(http://summer.cs.princeton.edu/status/) for the planetlab testbed. It uses the
following metrics for selecting nodes based on CPU and I have found such
selection to be very useful in determining the performance of a slice on the
machine.
[Song] It is also useful in selecting peer for a neighbor table entry, when
there are multiple choices existing and for the overlay management to collect
the overall status of the overlay.
From the comon site, these are some metrics that may be useful
"CPU Speed
Busy CPU
Sys CPU
Free CPU
These fields give some insight into the CPU behavior of the node. The CPU Speed
is just the speed of the processor in gigahertz. The Busy CPU field gives the %
of time the CPU is utilized, and the Sys CPU field specifies what percentage of
time the CPU is spending in the OS. Both of these values are the maximum values
over the past 5 minutes. The Free CPU indicates how much of the CPU a spin-loop
was able to obtain, giving some insight into how much of the node's CPU a new
slice would receive."
We could define these fields and leave it optional as to whether all of them
are required. i.e. running a spin-loop may be expensive for some devices.
[Song] This is helpful. I'm very glad to see this monitoring tool in the
planetlab testbed. If it works well in the planet lab, we may have it included
in the diagnostics draft after discussion. I also see other useful metrics for
other parameters in the page (http://summer.cs.princeton.edu/status/).
Best,
Saumitra
www.saumitra.info
Date: Tue, 11 Nov 2008 15:12:21 +0800
From: Song Haibin <melodysong(_at_)huawei(_dot_)com>
Subject: [P2PSIP] How to describe the processing power
To: p2psip(_at_)ietf(_dot_)org
Message-ID: <003e01c943cc$d6e2b1a0$0c0ca40a(_at_)china(_dot_)huawei(_dot_)com>
Content-Type: text/plain; charset=us-ascii
Dear all,
In p2psip diagnostics draft
http://tools.ietf.org/id/draft-zheng-p2psip-diagnose-03.txt
, we have some doubt about how to describe one of the diagnostic
information: processing power. We propose to use the unit of MIPS to describe
it. However, the Max number of connections may be another choice.
Do you have any good suggestions?
Best Regards,
Song Haibin
Email: melodysong(_at_)huawei(_dot_)com<mailto:melodysong(_at_)huawei(_dot_)com>
Skype: alexsonghw
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