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Alecco Locco

Wednesday, 22 February 2012. Scalability Rules of Thumb. This is a save post since source seems unreachable). L1 cache reference 0.5 ns. Branch mispredict 5 ns. L2 cache reference 7 ns. Mutex lock/unlock 25 ns. Main memory reference 100 ns. Compress 1K bytes with Snappy 3,000 ns. Send 2K bytes over 1 Gbps network 20,000 ns. Read 1 MB sequentially from memory 250,000 ns. Round trip within same datacenter 500,000 ns. Disk seek 10,000,000 ns. Read 1 MB sequentially from disk 20,000,000 ns. Links to this post.

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Alecco Locco | aleccolocco.blogspot.com Reviews

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Wednesday, 22 February 2012. Scalability Rules of Thumb. This is a save post since source seems unreachable). L1 cache reference 0.5 ns. Branch mispredict 5 ns. L2 cache reference 7 ns. Mutex lock/unlock 25 ns. Main memory reference 100 ns. Compress 1K bytes with Snappy 3,000 ns. Send 2K bytes over 1 Gbps network 20,000 ns. Read 1 MB sequentially from memory 250,000 ns. Round trip within same datacenter 500,000 ns. Disk seek 10,000,000 ns. Read 1 MB sequentially from disk 20,000,000 ns. Links to this post.

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Alecco Locco | aleccolocco.blogspot.com Reviews

https://aleccolocco.blogspot.com

Wednesday, 22 February 2012. Scalability Rules of Thumb. This is a save post since source seems unreachable). L1 cache reference 0.5 ns. Branch mispredict 5 ns. L2 cache reference 7 ns. Mutex lock/unlock 25 ns. Main memory reference 100 ns. Compress 1K bytes with Snappy 3,000 ns. Send 2K bytes over 1 Gbps network 20,000 ns. Read 1 MB sequentially from memory 250,000 ns. Round trip within same datacenter 500,000 ns. Disk seek 10,000,000 ns. Read 1 MB sequentially from disk 20,000,000 ns. Links to this post.

INTERNAL PAGES

aleccolocco.blogspot.com

1

Alecco Locco: August 2009

http://aleccolocco.blogspot.com/2009_08_01_archive.html

Tuesday, 25 August 2009. SQLite: A Lesson In Low-Defect Software. EDIT: Minor edits to fix HTML formatting, style, corrected footnote credit, and code indentation the editor kills on every edit.]. While looking for some old papers and presentations on SQLite (remember my disk died a few months ago without proper backup), even though it seems the old ones are offline or lost, there's a new presentation on their experience producing excellent software. A Lesson In Low-Defect Software. Use your whole brain.

2

Alecco Locco: APE, an AJAX push engine

http://aleccolocco.blogspot.com/2009/06/ape-ajax-push-engine.html

Monday, 8 June 2009. APE, an AJAX push engine. Project looks great. Doesn't even use a library for I/O or HTTP like libevent. Though that probably makes it more propense to known bugs. It needs some serious testin. I'm posting this just in case somebody following the Comet thing missed it. Subscribe to: Post Comments (Atom). APE, an AJAX push engine. This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.

3

Alecco Locco: And The Dog Ate My Homework

http://aleccolocco.blogspot.com/2008/12/and-dog-ate-my-homework.html

Monday, 29 December 2008. And The Dog Ate My Homework. After relocating from London to Buenos Aires my HD broke. Then, the pile of DVDs and CDs got lost including the OSX rescue (finding Mac install DVDs on christmas to borrow was quite a challenge) and my pre-flight backup DVDs were gone there too. Oh, and my hidden TrueCrypt volume got trashed by stupidly adding things to the outer volume (paranoia doesn't pay.). Besides that hiccup things are doing very well and even got a suntan.

4

Alecco Locco: Making a free hostel reservation system - pt 1

http://aleccolocco.blogspot.com/2009/02/making-reservation-system-that-doesnt.html

Tuesday, 10 February 2009. Making a free hostel reservation system - pt 1. Leveraging my inclination to postpone the comet server and other things, I got myself into a 2 day sprint. To make a proof of concept. That wouldn't suck and could be implemented for free. Current services are all closed source quasi-scams. Holding the customer's payment as ransom and take the first payment of the first day as commission ( 15 bucks per transaction! While still making the establishments update manually. I know many...

5

Alecco Locco: Scalability Rules of Thumb

http://aleccolocco.blogspot.com/2012/02/scalability-rules-of-thumb.html

Wednesday, 22 February 2012. Scalability Rules of Thumb. This is a save post since source seems unreachable). L1 cache reference 0.5 ns. Branch mispredict 5 ns. L2 cache reference 7 ns. Mutex lock/unlock 25 ns. Main memory reference 100 ns. Compress 1K bytes with Snappy 3,000 ns. Send 2K bytes over 1 Gbps network 20,000 ns. Read 1 MB sequentially from memory 250,000 ns. Round trip within same datacenter 500,000 ns. Disk seek 10,000,000 ns. Read 1 MB sequentially from disk 20,000,000 ns.

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cringely.com

I, Cringely Wall Street Can't Count - I, Cringely

http://www.cringely.com/2009/02/wall-street-cant-count

Wall Street Can't Count. This post first ran on January 29th on my mortgage blog. It got some traction there and a few mentions in the press so, lazy bastard that I am, I’m reproducing it here in a slightly improved form that corrects my own math error. Take a look at this chart that someone sent to me a couple days ago. I’m making it big so you can see as much detail as possible. Have a look and then come back, okay? Pretty scary, eh? Too bad the chart is wrong. So it’s a typo: no big deal, right? A nob...

nullpointerassign.blogspot.com

*NULL Pointer Assign: December 2009

http://nullpointerassign.blogspot.com/2009_12_01_archive.html

The flavors of Java concurrency control. This second post took longer than i expected. I was involved in a witch hunt in my day job for a few weeks and then everything else started piling up. The witch hunt got me into reviewing a lot of Java code running inside an ESB. To find any kind of performance hog i could spot with the naked eye. Yes, i know there are profiles, but good luck trying to run one of those things in a Bank's production environment. Int someValue = 0;. Synchronized int getNextValue() {.

nullpointerassign.blogspot.com

*NULL Pointer Assign: October 2010

http://nullpointerassign.blogspot.com/2010_10_01_archive.html

Not) Messing up your Data Model because of your ORM. A few months ago, one of my clients asked me to take a look at the Data Model of one of his applications because of performance problems. A review showed database tables had no indexes, that being the cause of the performance hit. Yet a deeper and complex structural problem surfaced upon further inspection. This second problem was, and still is, the result of lack of knowledge of both Databases and ORMs, so i thought it was worth sharing. Objects; and ...

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Alecco Locco

Wednesday, 22 February 2012. Scalability Rules of Thumb. This is a save post since source seems unreachable). L1 cache reference 0.5 ns. Branch mispredict 5 ns. L2 cache reference 7 ns. Mutex lock/unlock 25 ns. Main memory reference 100 ns. Compress 1K bytes with Snappy 3,000 ns. Send 2K bytes over 1 Gbps network 20,000 ns. Read 1 MB sequentially from memory 250,000 ns. Round trip within same datacenter 500,000 ns. Disk seek 10,000,000 ns. Read 1 MB sequentially from disk 20,000,000 ns. Links to this post.

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