COMP 3000 2011 Week 1 Notes - Revision history

Soma: /* Basics */

2011-11-06T02:57:55Z

Basics

← Older revision		Revision as of 02:57, 6 November 2011
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	'''OS''': set of code to change computer you have into the computer you want to program, provides a virtual/abstract machine to program hardware (certain abstractions imply certain implementation strategies)		'''OS''': set of code to change computer you have into the computer you want to program, provides a virtual/abstract machine to program hardware (certain abstractions imply certain implementation strategies)

	'''Linux''' is a kind of operating system kernel.		'''Linux''' is a kind of UNIX-compatible operating system kernel.

	The Linux kernel is everywhere: on Android, DVRs, home routers, servers, the cloud (amazon, facebook, google...)		The Linux kernel is everywhere: on Android, DVRs, home routers, servers, the cloud (amazon, facebook, google...)

Soma: /* Basics */

2011-11-06T02:57:41Z

Basics

← Older revision		Revision as of 02:57, 6 November 2011
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	Need to share:		Need to share:
	# ~~Disc files~~: ~~block interface~~ abstraction		# Disks: filesystem abstraction
	# Memory: divide it up (virtual memory)		# Memory: divide it up (virtual memory)
	# CPU: take turns and cut of those that are being hogs		# CPU: take turns (multiplex) and cut out those that are being hogs
	# Network: ~~divide~~ communication into packets (identify with IP for computer and port for the program)		# Network: multiplex by dividing communication into packets (identify with IP for computer and port for the program)

	'''OS''': set of code to change computer you have into the computer you want to program, provides a virtual/abstract machine to program hardware (certain abstractions imply certain implementation strategies)		'''OS''': set of code to change computer you have into the computer you want to program, provides a virtual/abstract machine to program hardware (certain abstractions imply certain implementation strategies)

	'''Linux'''		'''Linux''' is a kind of operating system kernel.

	~~'''Kernels'''~~: on Android, ~~dvr~~, home ~~router~~, servers, the cloud (amazon, facebook, google...)		The Linux kernel is everywhere: on Android, DVRs, home routers, servers, the cloud (amazon, facebook, google...)

	==Program Interaction==		==Program Interaction==

Gbooth: /* Basics */

2011-10-19T13:54:56Z

Basics

← Older revision		Revision as of 13:54, 19 October 2011
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	'''Kernels''': on Android, dvr, home router, servers, the cloud (amazon, facebook, google...)		'''Kernels''': on Android, dvr, home router, servers, the cloud (amazon, facebook, google...)

			==Program Interaction==

			How do programs not "step" on each other? To do this, a programs ability to refer to other programs needs to be taken away. In other words, separate programs must be unable to read and write to each other.

			On every memory access call, to see what physical address the call corresponds to, a table lookup is used.

			'''Virtual Memory''': each program has its own copy of memory, it's own "address space", so it can't access other programs address space

			'''Virtualization''': treat the OS kernel like a regular program

			'''Paravirtualization''': modify the OS kernel so it acts like a regular program (done by taking out its privileges)

			'''Hypervisor''': run multiple kernels with a new "super-kernel" that rules over the other kernels

			Paravirutalization and using a hypervisor add layers of interaction to the OS (multiple table lookups of address spaces).

Gbooth: /* Basics */

2011-10-18T03:51:21Z

Basics

← Older revision		Revision as of 03:51, 18 October 2011
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	'''OS''': set of code to change computer you have into the computer you want to program, provides a virtual/abstract machine to program hardware (certain abstractions imply certain implementation strategies)		'''OS''': set of code to change computer you have into the computer you want to program, provides a virtual/abstract machine to program hardware (certain abstractions imply certain implementation strategies)

	~~===~~Linux~~===~~		'''Linux'''

	'''Kernels''': on Android, dvr, home router, servers, the cloud (amazon, facebook, google...)		'''Kernels''': on Android, dvr, home router, servers, the cloud (amazon, facebook, google...)

Gbooth: /* Basics */

2011-10-18T03:46:11Z

Basics

← Older revision		Revision as of 03:46, 18 October 2011
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	==Basics==		==Basics==

	~~---~~Complexity~~---~~: computers are complicated, big, fast etc.		'''Complexity''': computers are complicated, big, fast etc.

	~~---~~UNIX~~---~~: made to share a computer between multiple people		'''UNIX''': made to share a computer between multiple people

	Need to share:		Need to share:
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	# Network: divide communication into packets (identify with IP for computer and port for the program)		# Network: divide communication into packets (identify with IP for computer and port for the program)

	~~---~~OS~~---~~: set of code to change computer you have into the computer you want to program, provides a virtual/abstract machine to program hardware (certain abstractions imply certain implementation strategies)		'''OS''': set of code to change computer you have into the computer you want to program, provides a virtual/abstract machine to program hardware (certain abstractions imply certain implementation strategies)

	===Linux===		===Linux===

	~~---~~Kernels~~---~~: on Android, dvr, home router, servers, the cloud (amazon, facebook, google...)		'''Kernels''': on Android, dvr, home router, servers, the cloud (amazon, facebook, google...)

Gbooth: Created page with "==Basics== ---Complexity---: computers are complicated, big, fast etc. ---UNIX---: made to share a computer between multiple people Need to share: # Disc files: block interfac…"

2011-10-18T03:45:38Z

Created page with "==Basics== ---Complexity---: computers are complicated, big, fast etc. ---UNIX---: made to share a computer between multiple people Need to share: # Disc files: block interfac…"

New page

==Basics==

---Complexity---: computers are complicated, big, fast etc.

---UNIX---: made to share a computer between multiple people

Need to share:
# Disc files: block interface abstraction
# Memory: divide it up (virtual memory)
# CPU: take turns and cut of those that are being hogs
# Network: divide communication into packets (identify with IP for computer and port for the program)

---OS---: set of code to change computer you have into the computer you want to program, provides a virtual/abstract machine to program hardware (certain abstractions imply certain implementation strategies)

===Linux===

---Kernels---: on Android, dvr, home router, servers, the cloud (amazon, facebook, google...)