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DATE 2015-02-01

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Key: id Value: 542878

Key: archive_learn Value: 2015-02-01

MESSAGE
DATE 2015-02-01
FROM Ruben
SUBJECT Subject: [LIU Comp Sci] DMA memory and CPU activity
From owner-learn-outgoing-at-mrbrklyn.com Sun Feb 1 11:24:32 2015
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Message-ID: <54CE533D.1040107-at-my.liu.edu>
Date: Sun, 01 Feb 2015 11:24:29 -0500
From: Ruben
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To: Samir Iabbassen , learn-at-nylxs.com,
Mohammed Ghriga
Subject: [LIU Comp Sci] DMA memory and CPU activity
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Dr Samir


I still have complaints ;)

Remember where it was taught and it was actually on exams , that when
the DMA memory controller copied blocks of data to main memory, then the
CPU, which lost control of the memory bus, was interrupted and not
active, and I read that in the book and saw it in the notes and but
still thought, No way. We disagreed in class and according to the
notes, you were 100% correct. But it didn't make sense. Its not that
useful to have DMA talking to memory and then the CPU not doing other
stuff in parallel.

I'm still at a loss on this matter... really, at minimum there is local
memory cache with the blocks of cache memory which it can work with, and
it just makes zero sense to have 4 or even 8 CPUs if they can't work in
parrelel with DMA activities.

Now, check this out from the operating systems class:

QUOTE:
To start an I/O operation, the device driver loads the appropriate registers
within the device controller. The device controller, in turn, examines the
contents of these registers to determine what action to take (such as “read
a character from the keyboard”). The controller starts the transfer of
data from
the device to its local buffer. Once the transfer of data is complete,
the device
controller informs the device driver via an interrupt that it has
finished its
operation. The device driver then returns control to the operating system,
possibly returning the data or a pointer to the data if the operation
was a read.
For other operations, the device driver returns status information.
This form of interrupt-driven I/O is fine for moving small amounts of data
but can produce high overhead when used for bulk data movement such as disk
I/O . To solve this problem, direct memory access (DMA) is used. After
setting
up buffers, pointers, and counters for the I/O device, the device controller
transfers an entire block of data directly to or from its own buffer
storage to
memory, with no intervention by the CPU. Only one interrupt is generated per
block, to tell the device driver that the operation has completed,
rather than
the one interrupt per byte generated for low-speed devices. While the device
controller is performing these operations, the CPU is available to
accomplish
other work.
Some high-end systems use switch rather than bus architecture. On these
systems, multiple components can talk to other components concurrently,
rather than competing for cycles on a shared bus. In this case, DMA is even
more effective. Figure 1.5 shows the interplay of all components of a
computer
system.

OPERATING
SYSTEM
CONCEPTS
ABRAHAM SILBERSCHATZ
Yale University
PETER BAER GALVIN
Pluribus Networks
GREG GAGNE
Westminster College


So now I am even MORe confused than before....

Any light you can shed?



Ruben

cc Dr Ghira, Learn

  1. 2015-02-01 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] DMA memory and CPU activity
  2. 2015-02-01 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] DMA memory and CPU activity
  3. 2015-02-01 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] DMA memory and CPU activity
  4. 2015-02-02 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] DMA memory and CPU activity
  5. 2015-02-02 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Operating System History
  6. 2015-02-02 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Operating System History
  7. 2015-02-02 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] study hall today
  8. 2015-02-02 Kamran <kamran.mirzayev-at-my.liu.edu> Re: [LIU Comp Sci] [announce-at-lists.isoc-ny.org: [isoc-ny] Two NYC
  9. 2015-02-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] blackboard notice
  10. 2015-02-02 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Landing Jobs in the IT Field
  11. 2015-02-02 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Operating System History
  12. 2015-02-02 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Operating Systems Quiz
  13. 2015-02-02 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Re: Operating System History
  14. 2015-02-02 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Re: Operating System History
  15. 2015-02-02 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [announce-at-lists.isoc-ny.org: [isoc-ny] Two NYC meetups Tuesday]
  16. 2015-02-03 Ruben <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] [announce-at-lists.isoc-ny.org: [isoc-ny] Two NYC
  17. 2015-02-04 Tony Genao <tony.genao-at-my.liu.edu> Re: [LIU Comp Sci] Compus Meeting
  18. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Compus Meeting
  19. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Compus Meeting
  20. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] [announce-at-lists.isoc-ny.org: [isoc-ny] Two NYC
  21. 2015-02-04 Tony Genao <tony.genao-at-my.liu.edu> Re: [LIU Comp Sci] [announce-at-lists.isoc-ny.org: [isoc-ny] Two NYC
  22. 2015-02-04 Kamran <kamran.mirzayev-at-my.liu.edu> Re: [LIU Comp Sci] [announce-at-lists.isoc-ny.org: [isoc-ny] Two NYC
  23. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] [announce-at-lists.isoc-ny.org: [isoc-ny] Two NYC
  24. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Operating System Design
  25. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Operating System Design
  26. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Operating System Design
  27. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Operating System Design
  28. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Operating System Design
  29. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Operating System Design
  30. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Operating System Design
  31. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Operating System Design
  32. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Re: Operating System Design
  33. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Re: Operating System Design
  34. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Re: Operating System Design
  35. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Re: Operating System Design
  36. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Re: Operating System Design
  37. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] (fwd) Re: Operating System Design
  38. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] algorithms pop tarts
  39. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] cgroups meeting
  40. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Compus Meeting
  41. 2015-02-04 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Essentail Database tools
  42. 2015-02-04 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] tony
  43. 2015-02-04 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [info-at-fsf.org: Gorgeous animated video against DRM]
  44. 2015-02-05 Tony Genao <tony.genao-at-my.liu.edu> Re: [LIU Comp Sci] tony
  45. 2015-02-05 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] tony
  46. 2015-02-05 Tony Genao <tony.genao-at-my.liu.edu> Re: [LIU Comp Sci] tony
  47. 2015-02-05 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] SOC assignment
  48. 2015-02-05 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [NYLXS - HANGOUT] Very Good Jobs
  49. 2015-02-07 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: why not use naked delete ?]
  50. 2015-02-07 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: why not use naked delete ?]
  51. 2015-02-07 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: why not use naked delete ?]
  52. 2015-02-08 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] Double Stacks
  53. 2015-02-08 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] Double Stacks
  54. 2015-02-08 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [announce-at-lists.isoc-ny.org: =?utf-8?Q?=5B?=
  55. 2015-02-09 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Fwd: Invitation: cgroups and cgroups v2
  56. 2015-02-09 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] OS Design
  57. 2015-02-10 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Fwd: operating systems design
  58. 2015-02-10 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Student Computer Sciences Study Center
  59. 2015-02-10 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [info-at-meetup.com: Invitation: NYLUG Open hacker hours]
  60. 2015-02-10 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [info-at-meetup.com: Monday: Join 56 Rubyists at "Project Night"]
  61. 2015-02-11 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Friday Morning Volunteer
  62. 2015-02-11 Ruben <ruben.safir-at-my.liu.edu> Re: [LIU Comp Sci] Friday Morning Volunteer
  63. 2015-02-11 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Re: [NYLXS - HANGOUT] Friday Morning Volunteer
  64. 2015-02-11 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] tony
  65. 2015-02-11 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Friday Morning Volunteer
  66. 2015-02-11 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Re: [NYLXS - HANGOUT] Friday Morning Volunteer
  67. 2015-02-11 Ruben <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Re: [NYLXS - HANGOUT] Friday Morning Volunteer
  68. 2015-02-11 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Towers of Hanio
  69. 2015-02-12 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] NEtworking Class
  70. 2015-02-12 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Re: Operating Systems (CS_643_001_BK_SPRG2015): Next Meeting Friday
  71. 2015-02-12 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Re: [NYLXS - HANGOUT] Friday Morning Volunteer
  72. 2015-02-12 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [announce-at-lists.isoc-ny.org: =?utf-8?Q?=5B?=
  73. 2015-02-12 mrbrklyn-at-panix.com Subject: [LIU Comp Sci] [dmarti-at-zgp.org: [linux-elitists] No results found for "social
  74. 2015-02-13 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Fwd: Re: Operating Systems (CS_643_001_BK_SPRG2015): Next Meeting
  75. 2015-02-15 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Friday Morning Volunteer
  76. 2015-02-15 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Re: Journal Article
  77. 2015-02-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Home Works
  78. 2015-02-17 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] OS Class Ctp 2 Dtrace
  79. 2015-02-18 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Hwk4 Allorithms
  80. 2015-02-18 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Recursive Allorithms
  81. 2015-02-19 From: "keisha.sylvester" <keisha.sylvester-at-my.liu.edu> RE: [LIU Comp Sci] Hwk4 Allorithms
  82. 2015-02-19 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Hwk4 Allorithms
  83. 2015-02-19 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Midterm Exams Samples
  84. 2015-02-20 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] a little C++ insite
  85. 2015-02-22 Ruben <ruben.safir-at-my.liu.edu> Re: [LIU Comp Sci] Binary tree Excersize
  86. 2015-02-22 Ruben <ruben.safir-at-my.liu.edu> Re: [LIU Comp Sci] Binary tree Excersize
  87. 2015-02-22 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Binary tree Excersize
  88. 2015-02-22 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Binary tree Excersize
  89. 2015-02-23 From: "keisha.sylvester" <keisha.sylvester-at-my.liu.edu> RE: Re: [LIU Comp Sci] Binary tree Excersize
  90. 2015-02-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Binary tree Excersize
  91. 2015-02-23 Keisha Sylvester <keisha.sylvester-at-my.liu.edu> Re: [LIU Comp Sci] Binary tree Excersize
  92. 2015-02-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Binary tree Excersize
  93. 2015-02-23 Ruben <ruben.safir-at-my.liu.edu> Re: [LIU Comp Sci] Binary tree Excersize
  94. 2015-02-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] scheduler resources
  95. 2015-02-23 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Study Schedule for Tuesday
  96. 2015-02-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Study Schedule for Tuesday
  97. 2015-02-23 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Operating Systems Class on Friday
  98. 2015-02-23 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] scheduler resources
  99. 2015-02-23 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Study Schedule for Tuesday
  100. 2015-02-24 From: "keisha.sylvester" <keisha.sylvester-at-my.liu.edu> RE: Re: [LIU Comp Sci] Binary tree Excersize
  101. 2015-02-24 Ruben Safir <mrbrklyn-at-panix.com> Re: Re: [LIU Comp Sci] Binary tree Excersize
  102. 2015-02-24 From: "keisha.sylvester" <keisha.sylvester-at-my.liu.edu> RE: Re: [LIU Comp Sci] Study Schedule for Tuesday
  103. 2015-02-24 Maneesh Kongara <maneeshkongara-at-gmail.com> Re: [LIU Comp Sci] Binary tree Excersize
  104. 2015-02-24 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Binary tree Excersize
  105. 2015-02-24 Keisha Sylvester <keisha.sylvester-at-my.liu.edu> Re: [LIU Comp Sci] Study anyone??
  106. 2015-02-24 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Study anyone??
  107. 2015-02-25 Ruben <ruben.safir-at-my.liu.edu> Re: [LIU Comp Sci] Binary tree Excersize
  108. 2015-02-25 Ruben Safir <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Binary tree Excersize
  109. 2015-02-25 Keisha Sylvester <keisha.sylvester-at-my.liu.edu> Re: [LIU Comp Sci] Binary tree Excersize
  110. 2015-02-26 Ruben <mrbrklyn-at-panix.com> Re: [LIU Comp Sci] Binary tree Excersize
  111. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Campus
  112. 2015-02-26 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Fwd: [NYLXS - HANGOUT] Bios
  113. 2015-02-26 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Re: Fwd: [NYLXS - HANGOUT] Bios
  114. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: Role of functional dependencies in
  115. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: Role of functional dependencies in
  116. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: Role of functional dependencies in
  117. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: Role of functional dependencies in
  118. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: Role of functional dependencies in
  119. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: Role of functional dependencies in
  120. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: Role of functional dependencies in
  121. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: Role of functional dependencies in
  122. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: Role of functional dependencies in
  123. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: Role of functional dependencies in
  124. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: Role of functional dependencies in
  125. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Re: Role of functional dependencies in
  126. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [mrbrklyn-at-panix.com: (fwd) Role of functional dependencies in
  127. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [mrbrklyn-at-panix.com: (fwd) Re: [LIU Comp Sci] Need tutoring on
  128. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [mrbrklyn-at-panix.com: (fwd) Re: [LIU Comp Sci] Need tutoring on
  129. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [mrbrklyn-at-panix.com: (fwd) Re: [LIU Comp Sci] Need tutoring on
  130. 2015-02-26 Ruben Safir <mrbrklyn-at-panix.com> Subject: [mrbrklyn-at-panix.com: (fwd) Re: [LIU Comp Sci] Need tutoring on
  131. 2015-02-27 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] a hate this question
  132. 2015-02-27 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Allorithms Midterm
  133. 2015-02-27 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Read the FUCKING NOTES
  134. 2015-02-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Allgorithm Examination
  135. 2015-02-28 Ruben <ruben.safir-at-my.liu.edu> Subject: [LIU Comp Sci] Linked List Test Question
  136. 2015-02-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] Re: [NYLXS - HANGOUT] Read the FUCKING NOTES
  137. 2015-02-28 Ruben Safir <mrbrklyn-at-panix.com> Subject: [LIU Comp Sci] [prmarino1-at-gmail.com: Re: [NYLXS - HANGOUT] Read the FUCKING NOTES

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