Hi Bart, You should set the NumberOfBuffers based on the amount of free memory available on the system , thus about 7.1GB * 0.66 / 8K (each buffer is 8K) = 585750 buffers ...
Best Regards Hugh Williams Professional Services OpenLink Software, Inc. // http://www.openlinksw.com/ Weblog -- http://www.openlinksw.com/blogs/ LinkedIn -- http://www.linkedin.com/company/openlink-software/ Twitter -- http://twitter.com/OpenLink Google+ -- http://plus.google.com/100570109519069333827/ Facebook -- http://www.facebook.com/OpenLinkSoftware Universal Data Access, Integration, and Management Technology Providers On 1 Apr 2014, at 09:36, Bart Vandewoestyne <bart.vandewoest...@telenet.be> wrote: > Hello list, > > I'm confused on how to set the NumberOfBUffers parameter. > > I have a machine which gives the following memory information in the > top-command when virtuoso is not running: > > Mem: 24680200k total, 17571268k used, 7108932k free, 58764k buffers > Swap: 542716k total, 14732k used, 527984k free, 16981620k cached > > So about 24 GB in total system RAM in the machine, of which 7 GB seems free. > > Section 16.16.1 in the virtuoso documentation recommends: > > System RAM NumberOfBuffers > ... > 16 GB 1360000 > 32 GB 2720000 > ... > > So with my 24 GB System RAM, I would set NumberOfBuffers to > (1360000+2720000)/2 = 2040000 > > However, when I look in the virtuoso.ini file, I see the comments: > > > ;; When running with large data sets, one should configure the Virtuoso > ;; process to use between 2/3 to 3/5 of free system memory and to stripe > ;; storage on all available disks. > ;; > ;; Uncomment next two lines if there is 2 GB system memory free > > > Notice that here, one talks about '_FREE_ system memory'. So based on > these comments, and since I have about 7 GB of free memory (see top > output above), and given the recommendations from section 16.16.1 > > System RAM NumberOfBuffers > ... > 4 GB 340000 > 8 GB 680000 > ... > > I would set the NumberOfBuffers parameter to > > 340000 + 340000*3/4 = 595000 > > > Which of the two is the correct way to set NumberOfBuffers? > > Thanks, > Bart > > ------------------------------------------------------------------------------ > _______________________________________________ > Virtuoso-users mailing list > Virtuoso-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/virtuoso-users
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