[yocto] Fwd: build failure on ubuntu 64bits development system

[Jim Abernathy]

On 01/19/2012 12:44 PM, Darren Hart wrote:
>
> On 01/19/2012 05:55 AM, Jim Abernathy wrote:
>> On 01/18/2012 04:34 PM, Darren Hart wrote:
>>> On 01/18/2012 09:05 AM, Jim Abernathy wrote:
>>>
>>>> FYI for those wanting to use Soft RAID, make sure you create one very
>>>> small primary partition for GRUB2 to put the second part of the
>>>> boot-loader in.  Can't use the old process.
>>> I strongly recommend using a separate DISK for your OS installation.
>>> Yocto builds are hard on disks, and RAID 0 increases your risk of
>>> failure in exchange for the added performance. I use a small SSD for my
>>> OS disk and a large RAID0 array of spinning disks for /build and another
>>> array for /virt (where my VM images live - easily recreated).
>>>
>> Learned a few things in this process. I appreciate all the help and advice.
>>
>>   1. So we know that at least with Edison, btrfs does not work with bitbake.
>>   2. When I rebuilt the system, this time I put the Linux root directory
>>      on an 80GB SSD.  That is where I also have my clone of Linux-Yocto
>>      repository, poky, and download directory , DL_DIR.
>>   3. I have create /build with EXT4 format on a Software RAID 0 (striped)
>>      partition, using 2 separate hard drives,  to use as the working
>>      build directory for bitbake. I have a striped swap file on the same
>>      two drives.  But with 8GB or RAM, I shouldn't be using that much.
>>
>> My build times for some of the basic meta-intel BSPs is around 103 minutes.
> You may be able to improve upon that with the following in /etc/fstab:
>
> /dev/md0  /build  ext4  noauto,noatime,nodiratime,commit=6000  0  2
>
> This reduces the number of writes due to updated access time and
> increases the commit interval so it doesn't stall while writing out
> every 5 minutes per default.
>
> NOTE: THIS INCREASES YOUR RISK OF DATA LOSS
>
> If your machine goes down during a build, you should plan on formatting
> that drive. If you only keep builds on it, they easily recreateable and
> you may find the performance boost is worth the risk.
>
I'll test this out and see.  I'm plan on keeping this system on a UPS 
anyway.

Jim S