FreeBSD 9.1 vs CentOS 6.3

Adam Vande More amvandemore at gmail.com
Sun Mar 24 16:09:55 UTC 2013


I think increasing the number of arenas may help the contention, eg "ln -s
3N /etc/malloc.conf"

On Sun, Mar 24, 2013 at 11:01 AM, Adam Vande More <amvandemore at gmail.com>wrote:

> These are interesting results.  Did you try tuning any of the jemalloc
> options in /etc/malloc.conf?
>
>
> On Sat, Mar 23, 2013 at 3:34 PM, Daniel Bilik <daniel.bilik at neosystem.cz>wrote:
>
>> On Fri, 22 Mar 2013 10:03:27 +0100
>> Davide D'Amico <davide.damico at contactlab.com> wrote:
>>
>> > Hi, I'm doing performance tests on a DELL R720, follows dmesg:
>> > ...
>> > I will use this server as a mysql-5.6 dbserver so I have a root
>> > partition using a hw raid1 and a /DATAZFS partition, follows
>> > configuration:
>> > ...
>>
>> Well, it seems to be interesting coincidence... We've just finished
>> benchmarking MySQL with various (m)allocators. The goal was to test
>> tcmalloc, but when the system was up and running, we've taken the
>> opportunity to benchmark also other alternatives... including jemalloc.
>> All tests were performed on default MySQL 5.5.28 running on Debian Wheezy.
>> Between the tests nothing was touched on the machine or the system, just
>> allocators were changed (ie. mysqld restarted).
>>
>> Results for different test modes are available here...
>>
>> http://neosystem.cz/benchmark/mysql/
>>
>> It seems there is notable performance penalty for read-only transactions
>> when MySQL is using jemalloc. The more concurrent threads are running, the
>> more is jemalloc losing to other allocators. The penalty is also there for
>> read-write transactions, but not that significant (error bars in the
>> histograms also show that results for read-write tests tend to be very
>> unstable). OTOH in non-transactional tests, jemalloc seems to be in par
>> with others, and under specific load can even outperform some of them.
>>
>> In your original post, there is not mentioned in what mode you've
>> performed
>> OLTP test, but according to numbers I suspect it was "complex", ie.
>> transactional. Can you repeat tests (both on CentOS and FreeBSD) with
>> --oltp-test-mode=nontrx and/or simple?
>>
>> --
>>                                                 Daniel Bilik
>>                                                 neosystem.cz
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>
>
>
> --
> Adam Vande More




-- 
Adam Vande More


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