Here's some data for microroot
gzip 49MB
gzip-9 49MB (the change was very little)
7za 48MB
z7a -mx9 47MB
However the decompression times changed. I used gunzip for cases here.
gzip-9
real 0m1.77s
user 0m1.39s
sys 0m0.35s
7za-mx9
real 0m1.89s
user 0m1.60s
sys 0m0.26s
-Sanjay
Moinak Ghosh wrote:
> Alok Aggarwal wrote:
>
>> On Tue, 18 Mar 2008, Moinak Ghosh wrote:
>>
>>
>>> Hi Folks,
>>>
>>> The present LiveCD contents can be better compressed to
>>> free up several tens of MBs more. Firstly Distro Constructor
>>> is calling lofiadm -C <filename> whereas it should call
>>> lofiadm -C gzip-9 <filename>. Even while compressing the
>>> microroot gzip -9 should be invoked.
>>>
>>> Secondly 7Zip (p7zip package) has the ability to compress
>>> in Gzip format but achieve better compression than Gzip itself.
>>> The resulting archive can be extracted by gunzip and does not
>>> impact decompression time. However lofiadm will need to be
>>> enhanced with a new algorithm type: gzip-7z
>>>
>> Do you have any numbers around the compression ratios
>> achieved but p7zip's implementation of gzip?
>>
>
> From past experience it will probably be around 2% better which
> will mean around 20MB savings after compression.
>
> In addition compressing the archive file using 7za(LZMA) will
> reduce it's size to 1/3rd of the current 40MB.
>
> Regards,
> Moinak.
>
>
>> Alok
>>
>
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