Re: MySQL Performance 6.0rc1

Hi, Marian,

在 2005-10-26三的 11:14 +0200，Marian Hettwer写道：
> Hi Folks,
> 
> I'm using RC1 on some of my test servers and workstations. So far, it 
> runs very good (as in stable and fast) :)
> However, I thought of doing a small benchmark of MySQL in comparison to 
> Linux 2.6.8 (Debian Sarge) and the results are kinda... shocking.
[...]
> Any Ideas where this huge difference comes from? Did I oversee some 
> debugging features still active in RC1 ?

There are many factors that can affect the performance of MySQL.  Would
you please post the output of "dumpfs /var | head -n 21" on your server?
(Replace /var with whatever mountpoint that your database is stored in).

Some observations that I think can affect MySQL performance:
 - Our malloc(3) implementation might be sub-optimal for the workload.
 - Lack of some POSIX system call which was implemented in other ways
(e.g. we do not have fsyncdata yet)
 - Some detailed implementation difference between our and Linux's
threading library, or MySQL itself.

I think David (davidxu_at_) had worked on performance of MySQL and he may
have some suggestions.

BTW.  What file system are you using on your Debian test?  What's the
mount options?

Cheers,
-- 
Xin LI <delphij delphij net>  http://www.delphij.net/