On Mon, Jan 14, 2013 at 02:21:00PM +0200, Marko Kreen wrote: > Note: reading from /dev/urandom does not affect /dev/random.
Reading from /dev/urandom drains the pool that serves /dev/random: $ cat /proc/sys/kernel/random/entropy_avail 3596 $ dd iflag=nonblock bs=100 count=1 if=/dev/random of=/dev/null 1+0 records in 1+0 records out 100 bytes (100 B) copied, 0.000174798 s, 572 kB/s $ cat /proc/sys/kernel/random/entropy_avail 2839 $ head -c10000000 /dev/urandom >/dev/null $ cat /proc/sys/kernel/random/entropy_avail 212 $ dd iflag=nonblock bs=100 count=1 if=/dev/random of=/dev/null 0+1 records in 0+1 records out 38 bytes (38 B) copied, 0.000101439 s, 375 kB/s -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
