Thanks for the reminder. After adjusting swappiness to 2 on each node, I see: http://pastebin.com/tFcAj7rw
Client buffer is now 10MB. But map tasks seem to be slower than before. On Mon, Jan 31, 2011 at 11:54 PM, tsuna <[email protected]> wrote: > On Mon, Jan 31, 2011 at 10:25 AM, Ted Yu <[email protected]> wrote: > > Here is output from vmstat: > > http://pastebin.com/VeGC5KQr > > This indicates that you're actively bringing in things from swap, > which kills performance. The columns "si" (swap in) and "so" (swap > out) should ideally always be 0. > > What's printed by /sbin/sysctl vm.swappiness ? > > -- > Benoit "tsuna" Sigoure > Software Engineer @ www.StumbleUpon.com >
