[OE-core] [RFC] Performance Issue: Build time increases

[Robert Yang]

On 08/12/2011 08:19 PM, Lu, Lianhao wrote:
> Robert Yang wrote on 2011-08-12:
>>
>> Hi folks,
>>
>> The build time of core-image-sato increases about 5 ~ 10 minutes than
>> the following commit:
>>
>> commit 5af197b55a4b779f1ec93186f0723026949ba2b5
>> Author: Liping Ke<liping.ke at intel.com>
>> Date:   Fri Jun 3 08:22:40 2011 +0800
>>
>>       cache: Implement multiple extra cache fields request support
>
> I think this patch only stores extra information in an extra cache. It only affects the parsing time, and I don't think there will be 5 min difference. How about comparing the "bitbake -e" time with and without the patch(by deleting all the cache files before running bitbake).
>

I'm sorry that I didn't describe it clearly, what I meant was that: This patch
worked correctly, it didn't increase the build time, but other patches after
this one made the build time increased, we just use this commit as a reference
point.

// Robert

> Best Regards,
> -Lianhao
>
>> On my host,
>> 1) the build time of 5af197b55a4b779f1ec93186f0723026949ba2b5 is:
>>
>> real    208m26.133s
>> user    241m29.280s
>> sys     47m0.630s
>>
>> 2) and: 068839698fe192d8846c0ed4db65861448e8e524 is:
>>
>> real    217m39.687s
>> user    255m34.150s
>> sys     48m21.510s
>>
>>
>> I use the bisect build method to find out which patch causes the time
>> increases, but the build time is not stable on my host(Ubuntu 11.04
>> 64bit), e.g., the build time of 1) is 208m at the first build, then
>> "git co other_commit" and build it, after about 10 builds, then go
>> back to build 5af197b55a4b779f1ec, the build time will increases about
>> 8 minutes, I have stopped the X and cron, at. This may have relationship with the linux distribution and disk.
>>
>> So I have to restart the build, reboot the machine by two days, and go
>> on the build. It would be better if anyone has other good method.
>>
>> I think that for the next release(e.g., yocto 1.2), we can find a
>> clean and stable machine(for the distribution, maybe RHEL is more
>> stable than Ubuntu) to check the build time weekly, so that we can notice the performance issue early.
>>
>
>
>
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