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Why is reading / dev / random almost always blocked?

I am using kubuntu with a kernel 2.6.38-12-generic

I want to read 16 random numbers from / dev / random at the beginning of my program. However, it blocks after a relatively short time.

How long does it take to populate / dev / random buffer? why it takes so long to fill.

I use this as an uuid generator with other sources of randomness added to the seed of my mersenne twister. It is very important that I do not receive duplicate or duplicate seeds.

If I switch to / dev / urandom, it works fine. Any kind of use of / dev / random over / dev / urandom.

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man 4 random :

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Thomas Hühn /dev/urandom

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