FreeBSD 9.1 vs CentOS 6.3
adrian at freebsd.org
Sun Mar 24 00:08:34 UTC 2013
I recall that there were significant issues with jemalloc on
computational loads, primarily because of the alignment jemalloc ends
up giving to various allocation sizes and the cache-busting behaviour
Does anyone remember the thread in which that happened? Maybe someone
posted a patch that lets people quickly tweak jemalloc to try and
On 23 March 2013 13:34, 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
> 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...
> 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
> freebsd-performance at freebsd.org mailing list
> To unsubscribe, send any mail to "freebsd-performance-unsubscribe at freebsd.org"
More information about the freebsd-performance