Vmstat: Difference between revisions
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r: The number of runnable processes (running or waiting for run time). | r: The number of runnable processes (running or waiting for run time). | ||
b: The number of processes in uninterruptible sleep. | b: The number of processes in uninterruptible sleep. | ||
[[File:Vmstat-procs-minimal.png | [[File:Vmstat-procs-minimal.png|center|500px]] | ||
== Memory Usage== | == Memory Usage== | ||
Memory | Memory | ||
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buff: the amount of memory used as buffers. | buff: the amount of memory used as buffers. | ||
cache: the amount of memory used as cache. | cache: the amount of memory used as cache. | ||
[[File:Vmstat-memory-minimal.png | [[File:Vmstat-memory-minimal.png|center|500px]] | ||
== IO Activity== | == IO Activity== | ||
IO | IO | ||
bi: Blocks received from a block device (blocks/s). | bi: Blocks received from a block device (blocks/s). | ||
bo: Blocks sent to a block device (blocks/s). | bo: Blocks sent to a block device (blocks/s). | ||
[[File:Vmstat-io-minimal.png | [[File:Vmstat-io-minimal.png|center|500px]] | ||
== System Operations== | == System Operations== | ||
System | System | ||
in: The number of interrupts per second, including the clock. | in: The number of interrupts per second, including the clock. | ||
cs: The number of context switches per second. | cs: The number of context switches per second. | ||
[[File:Vmstat-system-minimal.png | [[File:Vmstat-system-minimal.png|center|500px]] | ||
== CPU Resources== | == CPU Resources== | ||
CPU | CPU | ||
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wa: Time spent waiting for IO. Prior to Linux 2.5.41, included in idle. | wa: Time spent waiting for IO. Prior to Linux 2.5.41, included in idle. | ||
st: Time stolen from a virtual machine. Prior to Linux 2.6.11, unknown. | st: Time stolen from a virtual machine. Prior to Linux 2.6.11, unknown. | ||
[[File:Vmstat-cpu-minimal.png | [[File:Vmstat-cpu-minimal.png|center|500px]] | ||
Revision as of 20:31, 14 March 2017
System monitoring with vmstat
The following results were obtained based on data collected using vmstat, a tool that reports a system's virtual memory statistics.
These plots were produced using the scripts located on the bb-perf repository.
System Characteristics
Distro
CentOS Linux release 7.3.1611 (Core) Linux version 3.10.0-514.6.1.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC) ) #1 SMP Wed Jan 18 13:06:36 UTC 2017
RAM
MemTotal: 131814472 kB MemFree: 70067576 kB MemAvailable: 127241460 kB
Processor
Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 48 On-line CPU(s) list: 0-47 Thread(s) per core: 2 Core(s) per socket: 12 Socket(s): 2 NUMA node(s): 2 Vendor ID: GenuineIntel CPU family: 6 Model: 62 Model name: Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz Stepping: 4 CPU MHz: 1263.621
Vmstat Output
Processing Jobs
Procs
r: The number of runnable processes (running or waiting for run time).
b: The number of processes in uninterruptible sleep.
Memory Usage
Memory
swpd: the amount of virtual memory used.
free: the amount of idle memory.
buff: the amount of memory used as buffers.
cache: the amount of memory used as cache.
IO Activity
IO
bi: Blocks received from a block device (blocks/s).
bo: Blocks sent to a block device (blocks/s).
System Operations
System
in: The number of interrupts per second, including the clock.
cs: The number of context switches per second.
CPU Resources
CPU
These are percentages of total CPU time.
us: Time spent running non-kernel code. (user time, including nice time)
sy: Time spent running kernel code. (system time)
id: Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time.
wa: Time spent waiting for IO. Prior to Linux 2.5.41, included in idle.
st: Time stolen from a virtual machine. Prior to Linux 2.6.11, unknown.
