Instead of a file with 57885161 C'1', I tried a file of 57885161 X'FF'.
BEGIN {
for(i=0;i<57885161;i+=8) printf "%c",255;
}
08/05/2015 02:02 PM 7,235,646 prime.out
08/05/2015 02:03 PM 7,046 prime.out.gz
08/05/2015 02:04 PM 90 prime.out.gz.gz
and as noted, two passes through gzip.
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of Paul Gilmartin
Sent: Wednesday, August 5, 2015 12:57 PM
To: [email protected]
Subject: Re: useless but amusing: largest known prime
On 2015-08-05 12:50, Gibney, David Allen,Jr wrote:
> Taking 7M to store. I wonder how well that will compress :)
>
I decided to try something practical:
506 $
506 $ time awk 'BEGIN { for ( I = 0; I<57885161; I++ ) printf( 1 )
> print }' | gzip | wc
1 5 56203
real 0m18.422s
user 0m11.265s
sys 0m6.188s
507 $
507 $ uname -a
Linux Gil-CrunchBang-Lenovo 3.2.0-4-686-pae #1 SMP Debian 3.2.68-1+deb7u2 i686
GNU/Linux
Dismaying; barely a factor of 1000. And dumping shows obvious redundancy.
So I compressed it again (which rarely helps) and gained another factor of 200:
0 8 255
-- gil
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