On 4/10/09 10:31 AM, "Josh Berkus" <josh@xxxxxxxxxxxx> wrote: > Scott, > >> FIO with profiles such as the below samples are easy to set up, and they can >> be mix/matched to test what happens with mixed read/write seq/rand -- with >> surprising and useful tuning results. Forcing a cache flush or sync before >> or after a run is trivial. Changing to asynchronous I/O, direct I/O, or >> other forms is trivial. The output result formatting is very useful as >> well. > > FIO? Link? First google result: http://freshmeat.net/projects/fio/ Written by Jens Axobe, the Linux Kernel I/O block layer maintainer. He wrote the CFQ scheduler and Noop scheduler, and is the author of blktrace as well. " fio is an I/O tool meant to be used both for benchmark and stress/hardware verification. It has support for 13 different types of I/O engines (sync, mmap, libaio, posixaio, SG v3, splice, null, network, syslet, guasi, solarisaio, and more), I/O priorities (for newer Linux kernels), rate I/O, forked or threaded jobs, and much more. It can work on block devices as well as files. fio accepts job descriptions in a simple-to-understand text format. Several example job files are included. fio displays all sorts of I/O performance information. It supports Linux, FreeBSD, and OpenSolaris" > > > -- > Josh Berkus > PostgreSQL Experts Inc. > www.pgexperts.com > -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
