Monitoring OS Statistics
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Monitoring OS Statistics
Before tuning any stack, whether for a web server or a database server, you should know how heavily system resources are being used. To get the information, use the following commands:
- top
top - 15:50:31 up 309 days, 21:10, 1 user, load average: 0.06, 0.16, 0.15 Tasks: 134 total, 1 running, 133 sleeping, 0 stopped, 0 zombie PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 12929 root 18 0 3680m 1.2g 12m S 17.6 32.3 76:19.02 java
- mpstat
03:51:30 PM CPU %user %nice %system %iowait %irq %soft %idle intr/s 03:51:30 PM all 1.79 0.00 0.29 0.43 0.01 0.06 97.42 425.80 03:51:30 PM 0 3.22 0.00 0.43 0.47 0.02 0.21 95.65 151.15 03:51:30 PM 1 1.08 0.00 0.21 0.68 0.00 0.01 98.02 103.64 03:51:30 PM 2 1.65 0.00 0.28 0.38 0.00 0.02 97.68 96.45 03:51:30 PM 3 1.24 0.00 0.23 0.19 0.00 0.01 98.33 74.56
- vmstat
procs -----------memory----------- --swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 22264 1110200 168460 1120660 0 0 1 39 0 0 2 0 97 0
- free –m
total used free shared buffers cached Mem: 3945 2862 1083 0 164 1094 -/+ buffers/cache: 1603 2342 Swap: 1027 21 1005
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