Some techno, some not so! @deltamumblings-blog - Tumblr Blog

Speech API

Random notes: To be structured

http://www.ispeech.org/api The API returns the mp3 file. Issue - file size too large.

And then you stumble upon

com.apple.speech.recognition

IPV4 vs IPV6 representation

IPv4 addresses are 32-bits long, written in decimal format, and separated by periods.

IPv6 addresses are 128-bits long, written in hexadecimal format, and separated by colons. IPv4 addresses cannot be used as is in IPv6, but IPv6 does support a special class of addresses: the IPv4-mapped address.

In an IPv4-mapped address, the first 80 bits are set to zero, the next 16 bits are set to 1, and the last 32 bits represent the IPv4 address.

IPv4 address IPv4-mapped address (for use in IPv6) 192.0.2.1 ::ffff:192.0.2.1

Low Latency, High throughput Sockets - SDP

SDP - Sockets Direct Protocol - Fatest way for connections to transfer data as it is transferred directly from memory rather than going via operating system.

Supported in JDk 1.7 on Solaris and Linux. More details here, http://docs.oracle.com/javase/tutorial/sdp/sockets/index.html

InfiBand details, http://www.infinibandta.org/content/pages.php?pg=technology_overview

#JDK1.7 #LowLatency

JIRA/ Bugzilla Etiquette's

Things you should not do on your bug tracking system, read here, https://issues.apache.org/jira/browse/SOLR-2272

Memcache

At Facebook, https://www.facebook.com/note.php?note_id=39391378919

And at Twitter, http://engineering.twitter.com/ there is more than memcache here.

Details about how Twitter has scaled its database needs by writing custom implementations on MySQL (InnoDB) and for scalability uses Cassandera, Hadoop and Vertica

RAID, rather Nested RAID

Read about RAID's about more than half a decade, but was surprised to see RAID 10 today as i remembered RAID had just 5 levels. Learnt that the levels have become more interesting with Nested RAID's.

See Nested RAID's here, http://en.wikipedia.org/wiki/Nested_RAID_levels

#RAID

AllThingsD's tribute to Steve Jobs

Here is the link to collection from allthingsd.com, http://allthingsd.com/tag/steve-jobs/

Watched the tribute from Larry Ellison and Ed Catmul today, it was quite nice. Key takeaway - Attention to details and Being self - Say what you like, Say what you dont.

#SteveJobs

Seven Databases ... in a song!!

New Soul - Yael Naim

I'm a new soul I came to this strange world Hoping I could learn a bit 'bout how to give and take But since I came here, felt the joy and the fear Finding myself making every possible mistake See I'm a young soul in this very strange world Hoping I could learn a bit 'bout what is true and fake But why all this hate? try to communicate Finding trust and love is not always easy to make

This is a happy end Cause you don't understand Everything you have done Why's everything so wrong This is a happy end Come and give me your hand I'll take you far away

#New Soul

Voyager leaves our Solar System

Last week, in the corners of the Internet devoted to outer space, things started to get a little, well, hot. Voyager 1, the man-made object farthest away from Earth, was encountering a sharp uptick in the number of a certain kind of energetic particles around it. Had the spacecraft become the first human creation to "officially" leave the solar system?

It's hard to overstate how wild an accomplishment this would be: A machine, built here on Earth by the brain- and handiwork of humans, has sailed from Florida, out of Earth's orbit, beyond Mars, beyond the gas giants of Jupiter and Saturn, and may now have left the heliosphere -- tiny dot in the universe beholden to our sun. Had it really happened? How would we know?

HTTP Optimizations

HTTP 1.0 required strict "single request per connection" model, HTTP 1.1 reversed this behavior: by default, an HTTP 1.1 client and server keep the connection open, unless the client indicates otherwise (via Connection: close header).

Some key aspects to ensure:

Connection reuse: Ensure that your connection is not closed at end of each request, check header "Connection close"

Pipelining: Pipelining allows us to break the strict "send a request, wait for response" model. Instead, we can dispatch multiple requests, in parallel, over the same connection, without waiting for a response in serial fashion.

More details on browser implementations, http://en.wikipedia.org/wiki/HTTP_pipelining

IE 8 doesnt support Pipelining

Mozilla does, but is disabled by default

Chrome supports for HTTP but not for HTTPS

#HTTP Optimizations #HTTP1.1

Chrome DNS prefetching & TCP pre-connect

http://www.igvita.com/2012/06/04/chrome-networking-dns-prefetch-and-tcp-preconnect/

Excerpts from above website:

Each browser tab in Chrome is its own isolated process, which gives us great isolation and many security benefits.

An average DNS lookup takes 60~120ms, followed by a full round-trip (RTT) to perform the TCP handshake - combined, that creates 100-200ms of latency before we can even send the request!

chrome://network-action-predictor - omnibox predictor stats (tip: check 'Filter zero confidences')

chrome://net-internals/#sockets - current socket pool status

chrome://net-internals#dns - Chrome's in-memory DNS cache

chrome://histograms/DNS - histograms of your DNS performance

chrome://dns - startup prefetch list and subresource host cache

#chrome internals

Secuirty Tidbit

An A+ security grade involves hashing passwords with complex cryptographic functions, salting them, hashing the result again and storing those credentials on separate, secure Web servers where hackers cannot easily break in

Apple Blogs

Links [Would keep adding]

http://www.blog.montgomerie.net/

Sorrow - Pink Floyd

The sweet smell of a great sorrow lies over the land Plumes of smoke rise and merge into the leaden sky: A man lies and dreams of green fields and rivers, But awakes to a morning with no reason for waking He’s haunted by the memory of a lost paradise In his youth or a dream, he can’t be precise He’s chained forever to a world that’s departed It’s not enough, it’s not enough His blood has frozen & curdled with fright His knees have trembled & given way in the night His hand has weakened at the moment of truth His step has faltered One world, one soul Time pass, the river rolls And he talks to the river of lost love and dedication And silent replies that swirl invitation Flow dark and troubled to an oily sea A grim intimation of what is to be There’s an unceasing wind that blows through this night And there’s dust in my eyes, that blinds my sight And silence that speaks so much louder that words, Of promises broken

Trending Blogs

Recently Viewed Blogs

Some techno, some not so!