the lost logbook

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

Yay SSD!

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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

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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

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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:

Written by Utkarsh

October 6th, 2011 at 12:24 am

Posted in Technology

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Indian Independence Day – Another day & value of $50

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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, 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.
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Written by Utkarsh

August 14th, 2011 at 11:31 am

Posted in India,Start Up

next() in Java from The art of computer programming

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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 via Google code:

    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.


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

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