maria-developers team mailing list archive

[MARK CALLAGHAN <mdcallag@xxxxxxxxx>]

One of the features listed here
http://askmonty.org/wiki/index.php/MariaDB_versus_MySQL as a potential
backport is support for pool-of-threads. I am not sure how safe this
feature is today.

http://mysqlha.blogspot.com/2009/01/no-new-global-mutexes-and-how-to-make.html
describes some of the problems that might cause a server to hang when
pool-of-threads is used.

http://bugs.mysql.com/bug.php?id=42288 describes the performance
overhead of pool-of-threads. The overhead is significant for workloads
with fast queries such as sysbench.

I think that pool-of-threads needs a lot of work before it can be
considered safe. We backported this to our 5.0 branch at work and have
begun to search for fixes.

-- 
Mark Callaghan
mdcallag@xxxxxxxxx