So, I think:
1. Your problem is that whatever you used to do the % calculation overflowed integers and gave garbage results. Those are 20GB files.
2. In fact, you appear to have had about 6% compression.
3. That 6% was probably because there were a lot of executable files/binary data files in the tar file. Those do not compress as well as text. "Normal" compression is on the order of 70%.
Thanks Jim. I used
to get compression %. And again
while decompression. Both showed same , 175.7%.
And yes it is ture, no matter what compression % it showed , file is compressed.
I've noticed bzip2 gives a little bit better compression than gzip. So...I'm curious...what's gives the best compression out of all the compression utilities?
Thanks! (6 Replies)
Hi everybody,
Does anybody know,whether linux-2.4.20-8 supports predictor1 compression in PPP protocol support,as i was able to see there were only two compression techniques that r being supported i.e bsd and
deflate compression from "make menuconfig" under network device... (0 Replies)
Hello,
I have a .z file which i understand to be UNIX.
I'm on PC (no UNIX boxes) and have tried many different unzipping programs to extract this .z file, but only PicoZip has allowed me to view what is inside (telling me, i think, that it's not corrupt), but i have not been able to extract... (3 Replies)
Hi Folks,
As I am familiar wih both types compresion forms: gun-zip and .rpm. My questions is how do I uncompress gunz.zip type? As the .rpm I can double click and it will extract...Can someone shed some light on this and thank you...
M (2 Replies)
Hi All,
I have a random test file: test.txt, size: 146
$ ll test.txt
$ 146 test.txt
Take 1:
$ cat test.txt | gzip > test.txt.gz
$ ll test.txt.gz
$ 124 test.txt.gz
Take 2:
$ gzip test.txt
$ ll test.txt.gz
$ 133 test.txt.gz
As you can see, gzipping a file and piping into gzip... (1 Reply)
Hi Everyone,
I am a Ph.D student working on some image processing tasks and I have run into an interesting problem that I thought someone on here might have an idea about. This paper discusses a method to compare two images based upon the amount they can be compressed. Sorry, since this is my... (3 Replies)
Hello everyone,
As the title suggests, I am attempting to test adding gzip compression to a connection to an application I am testing. Currently I have the application set up with httptunnel, which forwards the connection to the remote host.
I would like to use a script to intercept the... (5 Replies)
Hi all,
I am working on a sample backup code, where i read the files per 7200 bytes and send it to server. Before sending to server, i compress each 7200 bytes using zlib compression algorithm using dictionary max length of 1.5 MB . I find zlib is slow.
Can anyone recommend me a... (3 Replies)
How good is the compression rate of gzip when you use tar with the gzip option? I am pretty amazed that a 1 GB file was reduced to 1019K. This is what I did.
tar -cvf tar_test.tar.gz -T /list_of_files
ls -hl
-rw-r-----. 1 owner group 19 Jul 23 16:00 list_of_files
-rw-r-----. 1 owner group... (7 Replies)