Talk:COMP 3000 Essay 2 2010 Question 5 - Revision history

J powers at 01:26, 3 December 2010

2010-12-03T01:26:25Z

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	I haven't done any work on the essay yet :( I'm going to proof read the essay. I will also attempt to elaborate on some of the ideas as I see fit. -Dlangloi		I haven't done any work on the essay yet :( I'm going to proof read the essay. I will also attempt to elaborate on some of the ideas as I see fit. -Dlangloi

			That is the impression I received from the paper as well Nicolas. Someone has implied that it does in our report.

			Unfortunately I do not think that I can edit what I planned to tonight. I have a in-class final tomorrow morning that I need to study for instead. I have some suggestions if anyone is interested. I do not think that the definitions for evacuation, execution filters and function quiescence are clear. The sentences that are copied from the book are in the semaphore definition (Very good idea to change this before it is marked). [[User:J powers\|J powers]] 01:26, 3 December 2010 (UTC)

Nlessard at 00:37, 3 December 2010

2010-12-03T00:37:02Z

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	Moved stuff to the front page and cleaned up references. Still waiting for people to expand if possible. Also, spellcheck ;) --[[User:Myagi\|Myagi]] 10:37, 24 November 2010 (UTC)		Moved stuff to the front page and cleaned up references. Still waiting for people to expand if possible. Also, spellcheck ;) --[[User:Myagi\|Myagi]] 10:37, 24 November 2010 (UTC)

	~~Expanded --[[User:Afranco2\|Afranco2]] 19:04, 27 November 2010 (UTC)~~

	I worked on revising our report last night. There are still sections that have to be explained more clearly. I will work on those and try to remove our direct quotations as the Professor said that we should avoiding using them. I also noticed a few sentences were taken directly from the textbook (slight modifications). Those will need to be changed.		I worked on revising our report last night. There are still sections that have to be explained more clearly. I will work on those and try to remove our direct quotations as the Professor said that we should avoiding using them. I also noticed a few sentences were taken directly from the textbook (slight modifications). Those will need to be changed.

	I have a question related to what someone wrote. Does LOOM also find race conditions (if it does where is it mentioned in the paper)? [[User:J powers\|J powers]] 19:54, 2 December 2010 (UTC)		I have a question related to what someone wrote. Does LOOM also find race conditions (if it does where is it mentioned in the paper)? [[User:J powers\|J powers]] 19:54, 2 December 2010 (UTC)

			-I can only see references to tools that find Race Conditions, not LOOM finding actual race conditions. It seems to be focused on fixing not finding them. I don't know if that's worth mentioning or not. --[[User:Nlessard\|Nlessard]] 00:37, 3 December 2010 (UTC)

	I haven't done any work on the essay yet :( I'm going to proof read the essay. I will also attempt to elaborate on some of the ideas as I see fit. -Dlangloi		I haven't done any work on the essay yet :( I'm going to proof read the essay. I will also attempt to elaborate on some of the ideas as I see fit. -Dlangloi

Dlangloi at 00:29, 3 December 2010

2010-12-03T00:29:18Z

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	I have a question related to what someone wrote. Does LOOM also find race conditions (if it does where is it mentioned in the paper)? [[User:J powers\|J powers]] 19:54, 2 December 2010 (UTC)		I have a question related to what someone wrote. Does LOOM also find race conditions (if it does where is it mentioned in the paper)? [[User:J powers\|J powers]] 19:54, 2 December 2010 (UTC)

			I haven't done any work on the essay yet :( I'm going to proof read the essay. I will also attempt to elaborate on some of the ideas as I see fit. -Dlangloi

J powers at 19:59, 2 December 2010

2010-12-02T19:59:30Z

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	Expanded --[[User:Afranco2\|Afranco2]] 19:04, 27 November 2010 (UTC)		Expanded --[[User:Afranco2\|Afranco2]] 19:04, 27 November 2010 (UTC)

	I worked on revising our report last night. There are still sections that ~~need~~ to be explained more clearly. I will work on those and ~~also~~ try to remove our direct quotations as the Professor said that we should avoiding using them.		I worked on revising our report last night. There are still sections that have to be explained more clearly. I will work on those and try to remove our direct quotations as the Professor said that we should avoiding using them. I also noticed a few sentences were taken directly from the textbook (slight modifications). Those will need to be changed.

	I have a question related to what someone wrote. Does LOOM also find race conditions (if it does where is it mentioned in the paper)? [[User:J powers\|J powers]] 19:54, 2 December 2010 (UTC)		I have a question related to what someone wrote. Does LOOM also find race conditions (if it does where is it mentioned in the paper)? [[User:J powers\|J powers]] 19:54, 2 December 2010 (UTC)

J powers at 19:54, 2 December 2010

2010-12-02T19:54:50Z

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	Expanded --[[User:Afranco2\|Afranco2]] 19:04, 27 November 2010 (UTC)		Expanded --[[User:Afranco2\|Afranco2]] 19:04, 27 November 2010 (UTC)

			I worked on revising our report last night. There are still sections that need to be explained more clearly. I will work on those and also try to remove our direct quotations as the Professor said that we should avoiding using them.

			I have a question related to what someone wrote. Does LOOM also find race conditions (if it does where is it mentioned in the paper)? [[User:J powers\|J powers]] 19:54, 2 December 2010 (UTC)

Afranco2 at 19:04, 27 November 2010

2010-11-27T19:04:09Z

← Older revision		Revision as of 19:04, 27 November 2010
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	Moved stuff to the front page and cleaned up references. Still waiting for people to expand if possible. Also, spellcheck ;) --[[User:Myagi\|Myagi]] 10:37, 24 November 2010 (UTC)		Moved stuff to the front page and cleaned up references. Still waiting for people to expand if possible. Also, spellcheck ;) --[[User:Myagi\|Myagi]] 10:37, 24 November 2010 (UTC)

			Expanded --[[User:Afranco2\|Afranco2]] 19:04, 27 November 2010 (UTC)

Dustinmartin: /* Why is it any better than what came before? */

2010-11-24T22:20:27Z

Why is it any better than what came before?

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	Previously, the two standard ways of fixing deployed race conditions were system updates and hot patches. LOOM is a superior choice to both these options for a number of reasons.		Previously, the two standard ways of fixing deployed race conditions were system updates and hot patches. LOOM is a superior choice to both these options for a number of reasons.

	~~First~~, ~~the main criticism of~~ the system update approach ~~is that this~~ requires that the system be rebooted. With desktop applications, this can sometimes be considered acceptable. However, server applications often do not have the luxury of being able to reboot because requests are coming from external sources and are expected to be processed.		Unlike LOOM, the system update approach requires that the system be rebooted before the fix can be implemented. With desktop applications, this can sometimes be considered acceptable. However, server applications often do not have the luxury of being able to reboot because requests are coming from external sources and are expected to be processed.

	~~Second, while~~ hot patches do not require a system reboot, they do have vulnerabilities. Namely, it is very difficult to apply a patch that corrects the error, or errors, but ~~that~~ leaves the rest of the system unaffected. Often when correcting ~~one error~~, others can appear. The main concern with hot patches however, is that their development is a time consuming process. A process which until developed and deployed, leaves the race condition vulnerable and exposed. The paper chronicles a real world Mozilla race condition whose hot patch took nearly 8 years of development to correct, all the while the vulnerability was exposed to all Mozilla users.		While hot patches do not require a system reboot, they do have their own specific vulnerabilities. Namely, it is very difficult to apply a patch that corrects the error, or errors, but leaves the rest of the system unaffected. Often when correcting a race condition via a hot patch, others can appear. The main concern with hot patches however, is that their development is a time consuming process. A process which until developed and deployed, leaves the race condition vulnerable and exposed. The paper chronicles a real world Mozilla race condition whose hot patch took nearly 8 years of development to correct, all the while the vulnerability was exposed to all Mozilla users.

			Flaws common to both the system update and hot patch approach are they very difficult to properly development, slow to implement, and result in potential unsafe ad hoc solutions that are not scalable. Conversely, LOOM is easy to use, fast to implement, highly flexible, scalable, and safe to use.
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Dustinmartin: /* Contribution */

2010-11-24T22:08:37Z

Contribution

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	Evaluation of LOOM was based on overhead, scalability, reliability, availability and timeliness. These were demonstrated using Apache and MySQL in conjunction with the multithreaded ApacheBench and SysBench, respectively.		Evaluation of LOOM was based on overhead, scalability, reliability, availability and timeliness. These were demonstrated using Apache and MySQL in conjunction with the multithreaded ApacheBench and SysBench, respectively.

			-------------
			====Why is it any better than what came before?====
			Previously, the two standard ways of fixing deployed race conditions were system updates and hot patches. LOOM is a superior choice to both these options for a number of reasons.

			First, the main criticism of the system update approach is that this requires that the system be rebooted. With desktop applications, this can sometimes be considered acceptable. However, server applications often do not have the luxury of being able to reboot because requests are coming from external sources and are expected to be processed.

			Second, while hot patches do not require a system reboot, they do have vulnerabilities. Namely, it is very difficult to apply a patch that corrects the error, or errors, but that leaves the rest of the system unaffected. Often when correcting one error, others can appear. The main concern with hot patches however, is that their development is a time consuming process. A process which until developed and deployed, leaves the race condition vulnerable and exposed. The paper chronicles a real world Mozilla race condition whose hot patch took nearly 8 years of development to correct, all the while the vulnerability was exposed to all Mozilla users.
			-------------

	===Critique===		===Critique===

Myagi at 15:46, 24 November 2010

2010-11-24T15:46:56Z

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	Edited and filled out the critique section. Edited a little bit here and there. --[[User:Afranco2\|Afranco2]] 17:41, 22 November 2010 (UTC)		Edited and filled out the critique section. Edited a little bit here and there. --[[User:Afranco2\|Afranco2]] 17:41, 22 November 2010 (UTC)

	Moved stuff to the front page and cleaned up references. Still waiting for people to expand if possible. --[[User:Myagi\|Myagi]] 10:37, 24 November 2010 (UTC)		Moved stuff to the front page and cleaned up references. Still waiting for people to expand if possible. Also, spellcheck ;) --[[User:Myagi\|Myagi]] 10:37, 24 November 2010 (UTC)

Myagi at 15:37, 24 November 2010

2010-11-24T15:37:37Z

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	Edited and filled out the critique section. Edited a little bit here and there. --[[User:Afranco2\|Afranco2]] 17:41, 22 November 2010 (UTC)		Edited and filled out the critique section. Edited a little bit here and there. --[[User:Afranco2\|Afranco2]] 17:41, 22 November 2010 (UTC)

			Moved stuff to the front page and cleaned up references. Still waiting for people to expand if possible. --[[User:Myagi\|Myagi]] 10:37, 24 November 2010 (UTC)