Compression tests

[ch3i]

Hi,

I have try some compression level, below results :

Host configuration :

• Core I5
• 12 Go RAM
• Ethernet : Giga

LAN Configuration :

• Ethernet : Giga

Deploy method : unicast

Installation :

• Single boot Windows 7
• Size : 87 Go

Compression : 0

-rwxrwxrwx 1 root root 512 févr. 10 10:32 d1.mbr
-rwxrwxrwx 1 root root 0 févr. 10 10:32 d1.original.swapuuids
-rwxrwxrwx 1 root root 25363450 févr. 10 10:32 d1p1.img
-rwxrwxrwx 1 root root 86580172755 févr. 10 10:53 d1p2.img
-rwxrwxrwx 1 root root 171142723 févr. 10 10:54 d1p3.img

Tasks :

Upload : not tested
Donwload : ~3G/Min - ~29 mins

Compression : 5 ( The winner )

-rwxrwxrwx 1 root root 512 mai 13 10:45 d1.mbr
-rwxrwxrwx 1 root root 0 mai 13 10:45 d1.original.swapuuids
-rwxrwxrwx 1 root root 8544045 mai 13 10:45 d1p1.img
-rwxrwxrwx 1 root root 40054036052 mai 13 11:03 d1p2.img
-rwxrwxrwx 1 root root 3459293 mai 13 11:04 d1p3.img

Tasks :

Upload : ~4.9G/Min - ~17 mins
Donwload : ~6.4G/Min - ~13mins

Compression : 9

-rwxrwxrwx 1 root root 512 mai 13 11:26 d1.mbr
-rwxrwxrwx 1 root root 0 mai 13 11:26 d1.original.swapuuids
-rwxrwxrwx 1 root root 8471371 mai 13 11:26 d1p1.img
-rwxrwxrwx 1 root root 39740659244 mai 13 12:10 d1p2.img
-rwxrwxrwx 1 root root 3035522 mai 13 12:10 d1p3.img

Tasks :

Upload : ~1.9G/Min - ~43mins
Donwload : ~6.9G/Min - ~12mins

[Tom Elliott]

I will be making an effort to switch the default from 9 to 5 or 6. It seems this is the best bang for your buck as Upload and Download are very well handled. Ultimately you’re not saving much more at 9 than you do at a compression rating of 5 or 6 and it just takes it so long to upload that it’s not really worth the effort. I mean it’s basically less than 1% size difference between 9 and 5.

I hope this is good for everybody, of course your own settings can be adjusted as well.

[DevinR]

I know that I speak for EVERYONE when saying yes, lets get it down to at least 6 (maybe 5?).

[Wayne Workman]

I always choose either 6 or 7.

6 for old stuff, 7 for new stuff…

that’s just me though.

[DevinR]

So I did my own testing and I don’t find there to be much difference for downloading, but compression level does seem to increase uploading time significantly. If interested, my post is titled more compression testing.