[packages/rpm] - disable removing duplicate ldconfig invocations optimization http://rpm5.org/community/rpm-devel

[Elan Ruusamäe]

On 09/10/2012 04:07 PM, Jeffrey Johnson wrote:
> On Sep 10, 2012, at 3:52 AM, Elan Ruusamäe wrote:
>
>> On 10.09.2012 09:12, baggins wrote:
>>> commit b6aa06669d52acb5791a88eef2b8499391c5b44e
>>> Author: Jan Rękorajski<baggins at pld-linux.org>
>>> Date:   Sun Sep 9 19:18:20 2012 +0200
>>>
>>>      - disable removing duplicate ldconfig invocations optimization
>>>        http://rpm5.org/community/rpm-devel/5380.html
>> just to comment why optimization is not needed:
>> recent glibc caches ldconfig calls, so it's not that heavy, and besides fs cache should be hot as well
>>
> Subjective claims of "not that heavy" and "should be hot" do not support the
> conclusion "optimization is not needed" without measurements.
>
> Can you provide measurements?
cold, without cache:
# rm -f /var/cache/ldconfig/aux-cache
# time ldconfig

real    0m15.335s
user    0m0.063s
sys     0m0.160s

hot, without cache:
# rm -f /var/cache/ldconfig/aux-cache
# time ldconfig

real    0m0.068s
user    0m0.030s
sys     0m0.037s

# rm -f /var/cache/ldconfig/aux-cache
# time ldconfig

real    0m0.067s
user    0m0.040s
sys     0m0.027s
# rm -f /var/cache/ldconfig/aux-cache
# time ldconfig

real    0m0.068s
user    0m0.037s
sys     0m0.027s


>
> 73 de Jeff
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-- 
glen