[OE-core] [PATCH 0/3] Fix xz compression command and optimize compression time

[Saul Wold]

On 07/12/2012 11:58 AM, Koen Kooi wrote:
> Any volunteers to test this on a system with >4 real cores?
>

Koen,

Does OE-Core or Poky have an image setup for using .xz by default?

I will run it on a machine I have, just want to make sure I am doing the 
same tests that Andrei is running.

I was about to ask what msm asked about the Memory info.


Sau!

> Op 12 jul. 2012, om 20:13 heeft Andrei Gherzan het volgende geschreven:
>
>> Koen suggested to add -T to xz commands. We have this option implemented in our current version .1alpha.
>>
>> -T threads, --threads=threads
>>               Specify the number of worker threads to use.  Setting threads to
>>               a special value 0 makes xz use as many threads as there are  CPU
>>               cores  on  the system.  The actual number of threads can be less
>>               than threads if the input file is not big enough  for  threading
>>               with  the  given  settings or if using more threads would exceed
>>               the memory usage limit.
>>
>> -------------------
>>
>> Memory: 7.8 GiB
>> Processor:: Intel® Core™ i5-2540M CPU @ 2.60GHz × 4
>>
>> File to compress: 1.9G
>>
>> xz -f -k -e -9 --check=crc32 (current configuration)
>> Memory: 673Mb
>> real    6m37.170s
>> user    6m35.389s
>> sys     0m0.884s
>> Compressed file size: 3.4Mb
>>
>> xz -f -k -e -9 -T 4 --check=crc32
>> Memory: Cannot allocate memory
>>
>> xz -f -k -e -8 -T 4 --check=crc32
>> Memory: 1.8G
>> real    3m24.462s
>> user    12m8.502s
>> sys     0m2.180s
>> Compressed file size: 3.4Mb
>>
>> xz -f -k -T 4 --check=crc32 (-e defaults to -6)
>> Memory: 471Mb
>> real    1m9.265s
>> user    4m8.972s
>> sys     0m0.944s
>> Compressed file size: 3.4Mb
>>
>> So my conclusion would be to use the default -e -6 with -T 0.
>>
>> The following changes since commit 90ad663909c0c8a405b22a510c9f957007d02669:
>>
>>   upstream_tracking: update boost (2012-07-09 17:21:38 +0100)
>>
>> are available in the git repository at:
>>
>>   git://git.yoctoproject.org/poky-contrib ag/xz
>>   http://git.yoctoproject.org/cgit.cgi/poky-contrib/log/?h=ag/xz
>>
>> Andrei Gherzan (3):
>>   image_types.bbclass: Fix COMPRESS_CMD for xz to redirect compressed
>>     data to file
>>   image_types.bbclass: Add XZ variable to set number of threads to be
>>     used while compressing
>>   image_types.bbclass: Default XZ_COMPRESSION_LEVEL to -e -6
>>
>> meta/classes/image_types.bbclass |    5 +++--
>> 1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> --
>> 1.7.9.5
>>
>
>
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