On 11/01/13 16:30, Dimitry Sibiryakov wrote: > 01.11.2013 11:49, Alex Peshkoff wrote: >> On 10/29/13 20:01, Dimitry Sibiryakov wrote: >>> Hello, All. >>> >>> Did someone try to cut subj off and feed metadata from system tables >>> directly every >>> time when they are needed? >> May be Jim? About 25 or more years ago :) > That time HDDs were slow and page cache was small. I wonder if somebody > already > questioned profit from this cache now. >
Specially if tried on SSD? Do not think that with reasonable OS cache disk performance is really critical for such relatively rare changing thing as metadata (i.e. all required pages will be present in OS cache). What we sooner save here are CPU cycles required to read data from OS an interpret them. Certainly full answer will give only an experiment. Do not think that it's time for it now, but see no problems with doing it when starting with post-3.0 version. ------------------------------------------------------------------------------ November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231&iu=/4140/ostg.clktrk Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
