Bart, On 1 Apr 2014, at 12:04, Bart Vandewoestyne <bart.vandewoest...@telenet.be> wrote:
> On 2014-04-01 11:35, Hugh Williams wrote: >> 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 ... > > Thanks for clarifying this, Hugh. However, after a discussion with a > colleague of mine, I'm not sure anymore about my 'free memory available > on the system'. > > My guess was that I simply could look at 'free' number in the 'Mem' line > of the top output: > > Mem: 24680200k total, 18088328k used, 6591872k free, 60096k buffers > Swap: 542716k total, 14724k used, 527992k free, 17495716k cached > > Here, that would be '6591872k free'. However, my colleague pointed me > to the output of 'free -m': > > $ free -m > total used free shared buffers cached > Mem: 24101 17664 6437 0 58 17085 > -/+ buffers/cache: 519 23581 > Swap: 529 14 515 > > According to him, I should also add the 'buffers' and 'cached' numbers. > A quick Google search resulting in [1] confirms this. So based on the > above output, my 'free memory available on the system' would be: > > 6437 MB (free) + 58 MB (buffers) + 17085 MB (cached) = 23580 MB > > and my number of buffers (according to your formula): > > 23.6GB * 0.66 / 8K = 1945350 buffers > > Are we correct? Could you let me know what is the most exact way to > find out the 'amount of free memory available on the system', in order > to set the NumberOfBuffers parameter as optimal as possible? [Hugh] Using the "free -m" on Linux is the best way to determine the available memory on Linux based systems, so you can use the method above provided there will be no other services on the system that might also need some of the system memory. Regards Hugh > > Kind regards, > Bart > > [1] > http://blog.scoutapp.com/articles/2010/10/06/determining-free-memory-on-linux > > ------------------------------------------------------------------------------ > _______________________________________________ > Virtuoso-users mailing list > Virtuoso-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/virtuoso-users ------------------------------------------------------------------------------ _______________________________________________ Virtuoso-users mailing list Virtuoso-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/virtuoso-users
