the lost logbook

Utkarsh's mind.random() on Programming, India and Startups

Yay SSD!

leave a comment

Just upgraded my MacBook Pro 2011 (early) from a 500GB Toshbia HDD to Crucial 256GB SSD! And I will let the numbers do the talking!

Comparison of 500GB HDD vs 256GB SDD on a MacBook Pro 2011.

 

1. Performance stats for HDD (which comes with MacBook pro 2011):

 

2. Performance stats for SSD (Crucial):

Written by Utkarsh

November 22nd, 2012 at 2:15 am

Posted in Technology

Jiddu Krishnamurti

one comment

This guy is amazing, I understand him better as I grow up.

Written by Utkarsh

May 12th, 2012 at 4:36 am

Posted in Technology

Thank you Mr. Jobs

leave a comment

Thank you.

We aspire to be like you, but Steve Jobs will always be known as “The crazy one” and “The insanely awesome” visionary!

Your job is done, sleep well :)

And……a small gift for you: StayHungryStayFoolish.me

Written by Utkarsh

October 6th, 2011 at 12:24 am

Posted in Technology

Tagged with ,

Indian Independence Day – Another day & value of $50

one comment

I have written previously about our Republic day, and the importance of education from the grass root level, Gandhi’s ideology and his take on education.

So, today I was donating some money to giveindia.org, started by IIM-A Alum, Venkat Krishnan. This is not like any other NGO aggregation “startup”, but a trust worthy one. They take the pains to filter out NGOs in India which actually do relevant work and do not exist just to mint money.
Read the rest of this entry »

Written by Utkarsh

August 14th, 2011 at 11:31 am

Posted in India,Start Up

next() in Java from The art of computer programming

leave a comment

xkcd: Random NumberI have always used Random’s nextInt() or nextLong(). So was curious on how “random” is it actually? Then I found this protected method next().

protected int next(int bits)

 

Implementation of Random.java via Google code:

1
2
3
4
5
6
7
8
9
    protected int next(int bits) {
        long oldseed, nextseed;
        AtomicLong seed = this.seed;
        do {
            oldseed = seed.get();
            nextseed = (oldseed * multiplier + addend) & mask;
        } while (!seed.compareAndSet(oldseed, nextseed));
        return (int)(nextseed >>> (48 - bits));
    }

The general contract of next is that it returns an int value and if the argument bits is between 1 and 32 (inclusive), then that many low-order bits of the returned value will be (approximately) independently chosen bit values, each of which is (approximately) equally likely to be 0 or 1. The method next is implemented by class Random by atomically updating the seed to

(seed * 0x5DEECE66DL + 0xBL) & ((1L << 48) - 1)

and returning

(int)(seed >>> (48 - bits))

This is a linear congruential pseudorandom number generator, as defined by D. H. Lehmer and described by Donald E. Knuth in The Art of Computer Programming, Volume 3: Seminumerical Algorithms, section 3.2.1.

Interesting!

EDIT: Something even more interesting: Why this code is giving strange result? So Random?

Link to JavaDocs for Random.

Written by Utkarsh

August 1st, 2011 at 11:47 pm

Posted in Technology

Page optimized by WP Minify WordPress Plugin