With sar and iowait, we can get CPU time utilization. But, when I executed both commands, I could see significant differences in their outputs. > iostat && sar 1 1Linux 2.6.32-042stab090.4 (LinuxBox)     08/14/2014      _x86_64_        (16 CPU)avg-cpu:  %user   %nice %system %iowait  %steal   %idle           0.46    0.00    0.52    0.07    0.00   98.95Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtnsda              10.53       760.66        44.67 3464410204  203460004sdb               2.49       368.15       779.18 1676748162 3548769968sdc               4.09       192.81        10.71  878170395   48792907Linux 2.6.32-042stab090.4 (LinuxBox)     08/14/2014      _x86_64_        (16 CPU)10:35:21 AM     CPU     %user     %nice   %system   %iowait    %steal     %idle10:35:22 AM     all      0.00      0.00      0.06      0.00      0.00     99.94Average:        all      0.00      0.00      0.06      0.00      0.00     99.94It is very difficult for me to decide which output is more reliable. Which command should be considered as more accurate one?
Difference between 'sar' and 'iostat' commands
linux;cpu;system information;iostat