June 2013 - Asg - mailman3.cels.anl.gov

Wiki update: File:Asg overview june.pdf
by Wiki update: Asg-private: Harms 04 Jun '13

04 Jun '13

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Mercury RPC web site
by Phil Carns 03 Jun '13

03 Jun '13

FYI, here is the trac site for the Mercury library that Kevin talked about in his presentation: http://trac.mcs.anl.gov/projects/mercury That page is pretty minimal, but the repo is available and it has a README file in it with an overview: http://trac.mcs.anl.gov/projects/mercury/browser/README -Phil

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TAMU Status Update
by Gim Jongmin 03 Jun '13

03 Jun '13

All concerned, Status update for TAMU * Path ACL (UCSC paper): -- implemented, but it still has some problems related with FUSE option and some code (60% completed) * Rename: fully implemented and working but we should consider new interface for rename to reduce copy overhead (80% completed) * Proposed new idea to reduce list (directory lookup) overhead -- In previous design, every metadata has its own record even though the size is smaller than 200byte. In this suggestion, only directories have records, and metadata for files in the directory exist as a lowdata in the directory record. It can reduce number of server connections for directory lookup when the filesystem grows up. If there is 100 files in a directory, list (directory lookup) requires 100 or more times server connections, but our suggestion requires only 3 times server connections. -- details are described with a presentation material. Sincerely, Jongmin -- Jongmin Gim Post-Doctoral Research Associate Dept. of Elecrical and Computer Enginerring Texas A&M University 333D Wisenbaker College Station, TX 77843-3259

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UAB Weekly Status Update
by Shane Farmer 03 Jun '13

03 Jun '13

All, This week after investigation we closed a tricky issue that Matthew Curry discovered; this should increase stability at scale considerably. We are working on a test case to reproduce so we can release with confidence. We've had some people move around the country for the summer and are managing that, and will sustain progress on all fronts. Shane

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TAMU Status Update
by Gim Jongmin 03 Jun '13

03 Jun '13

All concerned, Status update for TAMU * Path ACL (UCSC paper): -- implemented, but it still has some problems related with FUSE option and some code (60% completed) * Rename: fully implemented and working but we should consider new interface for rename to reduce copy overhead (80% completed) * Proposed new idea to reduce list (directory lookup) overhead -- In previous design, every metadata has its own record even though the size is smaller than 200byte. In this suggestion, only directories have a record to store metadata for files and sub-dirs in the directory. It is motivated by the fact that too many server connections for "ls" can crashes FUSE client. It can not only reduce number of server connections for directory lookup when the filesystem grows up, but also increase the performance. If there is 100 files in a directory, list (directory lookup) requires 100 or more times server connections, but our suggestion requires only 3 times server connections. -- details will be provided with a formal document Sincerely, Jongmin -- Jongmin Gim Post-Doctoral Research Associate Dept. of Elecrical and Computer Enginerring Texas A&M University 333D Wisenbaker College Station, TX 77843-3259

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ANL Monthly Presentation for June
by Kevin Harms 03 Jun '13

03 Jun '13

here are the slides (attached pdf) that will be presented for the ANL monthly presentation. kevin

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Weekly report
by guoxinl＠clemson.edu 03 Jun '13

03 Jun '13

Hi all, For last week, I was working on studying how other methods model the cloud storage system, and how they derive the performance constraint. In this week, I will try to model the system using queuing theory. Guoxin

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ANL Status Update
by Kevin Harms 03 Jun '13

03 Jun '13

Status update for ANL * Working on evaluation of Mercury RPC library * Working on rebuild simulation - adding new components - refining interfaces between components kevin

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Weekly status update
by Benafsh Husain 03 Jun '13

03 Jun '13

Dear All, Based on everyone's decision to send out a written summary of past week's work, I am enlisting my updates as follows: 1) I began my summer RA at Argonne last Tuesday. 2) Installed and built ROSS, the bit wise simulator on which I hope to simulate the security system eventually. 3) Successfully created a basic model on ROSS (only 2 states of a logic process, and no roll back). 4) Currently, trying to gain a better understanding on how ROSS maintains states based on events (messages), and will further modify the model to include Roll back of the Logic process state. I hope this is detailed enough and yet not too verbose. Thanks, Benafsh

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