The Intel SSE 4.2 instruction set added the new CRC32C computation instructions. They are super cool and they are SO MUCH faster than doing the CRC calculation in software.But, as I was coding up crc32c for something, I noticed that the CRC32 instruction has a mode that returns a 64 bit value for 64 bit source operands, and a 64 bit value for an 8 bit source operand (in addition to 32 bit...
I'm trying to rationalize this in my head, any help is welcome."1 million individuals, each participate in 3 text message conversations per hour.Each text message conversation involves 6 text messages over a 300 second (5 minute) period.You are designing a system to handle this load. What is the number of text messages per second being generated, why?"Here's my reckoning 1 million x 3 text...
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Why would you conclude that MongoDB was "fast" and SQL Server was slow? Did you run SQL server on the same SSD's and multiple HDD's?
to willvarfar's comments, what was the real fsync cost and didn't you get ACID with SQL Server? Now, if ACID is not really required, and you really really need flexible schemas, then by all means ... I understand that you want distributed-queryable-notepad, not a relational database!
Is there a substitute for this google reader functionality?I would like a bookmarklet that will allow me to "save" whatever web page I am currently viewing, and export a time-ordered list of these bookmarks as an RSS feed.I use the Share on Google Reader (now deceased) functionality to generate a "Shared Items feed" that I used on my blog.Is there a substitute that you know of that gives me:1....
I heard of this training and thought I'd pass it along as it may interest others in the community."Fairhaven Capital is pleased to announce they will be sponsoring and hosting two Ruby on Rails workshops taught by thoughtbot, a leader in Rails development and training. These courses are designed to allow Boston-area developers gain a better working knowledge of Rails.The first workshop, to be...
I am attempting to categorize the use of databases by web applications, and looking to make a list of "parameters" to consider in such a taxonomy.For example:- size of data - schema: rigid vs. flexible - response time: micro-second, ... hours, ... days - query language vs. API - standard query encapsulation (xDBC) vs. API - single <table> queries vs. joins - the number of tables - the...
I have seen a lot of discussion about how this patent does (or does not) resemble the sudo command. I am also interested in some other verbiage in that patent application about how users can do bad things if they are logged in as administrators and that is the subject of a blog post http://hypecycles.wordpress.com/2009/11/15/microsoft-patent-7617530/My question for HN is this: Doesn't the thing...