Linux使用 -- sar + iftop

sar

1
yum install sysstat

CPU

1
2
3
4
5
6
7
8
9
10
$ sar -u ALL 1 5
Linux 2.6.32-696.el6.x86_64 (xxx) 2019年10月15日 _x86_64_ (40 CPU)

17时25分50秒 CPU %usr %nice %sys %iowait %steal %irq %soft %guest %idle
17时25分51秒 all 14.75 0.00 1.13 0.00 0.00 0.00 0.25 0.00 83.87
17时25分52秒 all 11.17 0.00 1.74 0.00 0.00 0.00 0.25 0.00 86.84
17时25分53秒 all 12.31 0.00 1.61 0.00 0.00 0.00 0.25 0.00 85.83
17时25分54秒 all 12.85 0.00 1.41 0.00 0.00 0.00 0.30 0.00 85.44
17时25分55秒 all 12.18 0.00 1.31 0.00 0.00 0.00 0.25 0.00 86.26
平均时间: all 12.65 0.00 1.44 0.00 0.00 0.00 0.26 0.00 85.65
  1. %user
    • Percentage of CPU utilization that occurred while executing at the user level (application).
    • Note that this field includes time spent running virtual processors.
  2. %usr
    • Percentage of CPU utilization that occurred while executing at the user level (application).
    • Note that this field does NOT include time spent running virtual processors.
  3. %nice
    • Percentage of CPU utilization that occurred while executing at the user level with nice priority.
  4. %system
    • Percentage of CPU utilization that occurred while executing at the system level (kernel).
    • Note that this field includes time spent servicing hardware and software interrupts.
  5. %sys
    • Percentage of CPU utilization that occurred while executing at the system level (kernel).
    • Note that this field does NOT include time spent servicing hardware or software interrupts.
  6. %iowait
    • Percentage of time that the CPU or CPUs were idle during which the system had an outstanding disk I/O request.
  7. %steal
    • Percentage of time spent in involuntary wait by the virtual CPU or CPUs while the hypervisor was servicing another virtual processor.
  8. %irq
    • Percentage of time spent by the CPU or CPUs to service hardware interrupts.
  9. %soft
    • Percentage of time spent by the CPU or CPUs to service software interrupts.
  10. %guest
    • Percentage of time spent by the CPU or CPUs to run a virtual processor.
  11. %gnice
    • Percentage of time spent by the CPU or CPUs to run a niced guest.
  12. %idle
    • Percentage of time that the CPU or CPUs were idle and the system did not have an outstanding disk I/O request.

内存

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
$ sar -r 1 5
Linux 2.6.32-696.el6.x86_64 (xxx) 2019年10月15日 _x86_64_ (40 CPU)

18时09分14秒 kbmemfree kbmemused %memused kbbuffers kbcached kbcommit %commit
18时09分15秒 404496 65578096 99.39 100240 10128668 100398588 121.89
18时09分16秒 439788 65542804 99.33 100260 10136372 100398984 121.89
18时09分17秒 435164 65547428 99.34 100360 10140920 100399712 121.89
18时09分18秒 418348 65564244 99.37 100404 10147072 100400992 121.90
18时09分19秒 414344 65568248 99.37 100464 10150912 100401388 121.90
平均时间: 422428 65560164 99.36 100346 10140789 100399933 121.89

$ free
total used free shared buffers cached
Mem: 65982592 65590372 392220 3777404 100700 10166360
-/+ buffers/cache: 55323312 10659280
Swap: 16383996 291572 16092424
  1. kbmemfree
    • Amount of free memory available in kilobytes.
  2. kbmemused
    • Amount of used memory in kilobytes (calculated as total installed memory - kbmemfree - kbbuffers - kbcached - kbslab).
  3. %memused
    • Percentage of used memory.
  4. kbbuffers
    • Amount of memory used as buffers by the kernel in kilobytes.
  5. kbcached
    • Amount of memory used to cache data by the kernel in kilobytes.
  6. kbcommit
    • Amount of memory in kilobytes needed for current workload.
    • This is an estimate of how much RAM/swap is needed to guarantee that there never is out of memory.
  7. %commit
    • Percentage of memory needed for current workload in relation to the total amount of memory (RAM+swap).
    • This number may be greater than 100% because the kernel usually overcommits memory.
  8. kbslab
    • Amount of memory in kilobytes used by the kernel to cache data structures for its own use.

IO

1
2
3
4
5
6
7
8
9
10
$ sar -b 1 5
Linux 2.6.32-696.el6.x86_64 (xxx) 2019年10月15日 _x86_64_ (40 CPU)

18时21分42秒 tps rtps wtps bread/s bwrtn/s
18时21分43秒 107.07 1.01 106.06 8.08 26965.66
18时21分44秒 319.19 2.02 317.17 16.16 136614.14
18时21分45秒 34.00 0.00 34.00 0.00 2280.00
18时21分46秒 36.00 0.00 36.00 0.00 2736.00
18时21分47秒 36.63 0.99 35.64 15.84 2352.48
平均时间: 106.01 0.80 105.21 8.02 33935.07
  1. tps
    • Total number of transfers per second that were issued to physical devices. A transfer is an I/O request to a physical device. Multiple logical requests can be combined into a single I/O request to the device. A transfer is of indeterminate size.
  2. rtps
    • Total number of read requests per second issued to physical devices.
  3. wtps
    • Total number of write requests per second issued to physical devices.
  4. bread/s
    • Total amount of data read from the devices in blocks per second. Blocks are equivalent to sectors and therefore have a size of 512 bytes.
  5. bwrtn/s
    • Total amount of data written to devices in blocks per second.

设备

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 99G 5.3G 89G 6% /
tmpfs 32G 3.7G 28G 12% /dev/shm
/dev/sda1 477M 28M 425M 7% /boot
/dev/sda5 436G 71M 414G 1% /data
/dev/sdb1 3.7T 2.5T 1.1T 70% /data1

$ sar -dp 1 3
Linux 2.6.32-696.el6.x86_64 (xxx) 2019年10月15日 _x86_64_ (40 CPU)

16时51分55秒 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util
16时51分56秒 sda 1.00 0.00 240.00 240.00 0.00 3.00 3.00 0.30
16时51分56秒 sdb 50.00 0.00 4312.00 86.24 0.01 0.10 0.08 0.40

16时51分56秒 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util
16时51分57秒 sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
16时51分57秒 sdb 31.68 0.00 2099.01 66.25 0.00 0.03 0.03 0.10

16时51分57秒 DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util
16时51分58秒 sda 4.08 0.00 106.12 26.00 0.00 0.75 0.75 0.31
16时51分58秒 sdb 17.35 0.00 1102.04 63.53 0.00 0.06 0.06 0.10

平均时间: DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util
平均时间: sda 1.67 0.00 115.05 68.80 0.00 1.20 1.20 0.20
平均时间: sdb 33.11 0.00 2512.37 75.88 0.00 0.07 0.06 0.20
  1. tps
    • Indicate the number of transfers per second that were issued to the device. Multiple logical requests can be combined into a single I/O request to the device. A transfer is of indeterminate size.
  2. rd_sec/s
    • Number of sectors read from the device. The size of a sector is 512 bytes.
  3. wr_sec/s
    • Number of sectors written to the device. The size of a sector is 512 bytes.
  4. avgrq-sz
    • The average size (in sectors) of the requests that were issued to the device.
  5. avgqu-sz
    • The average queue length of the requests that were issued to the device.
  6. await
    • The average time (in milliseconds) for I/O requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them.
  7. svctm
    • The average service time (in milliseconds) for I/O requests that were issued to the device.
    • Warning! Do not trust this field any more. This field will be removed in a future sysstat version.
  8. %util
    • Percentage of elapsed time during which I/O requests were issued to the device (bandwidth utilization for the device).
    • Device saturation occurs when this value is close to 100%.

进程

1
2
3
4
5
6
7
8
9
10
$ sar -q 1 5
Linux 2.6.32-696.el6.x86_64 (xxx) 2019年10月15日 _x86_64_ (40 CPU)

18时32分20秒 runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15
18时32分21秒 11 39947 1.42 2.59 3.96
18时32分22秒 6 39942 1.42 2.59 3.96
18时32分23秒 5 39943 1.42 2.59 3.96
18时32分24秒 4 39939 1.42 2.59 3.96
18时32分25秒 8 39939 3.79 3.06 4.10
平均时间: 7 39942 1.89 2.68 3.99
  1. runq-sz
    • Run queue length (number of tasks waiting for runtime).
  2. plist-sz
    • Number of tasks in the task list.
  3. ldavg-1
    • System load average for the last minute.
    • The load average is calculated as the average number of runnable or running tasks (R state), and the number of tasks in uninterruptible sleep (D state) over the specified interval.
  4. ldavg-5
    • System load average for the past 5 minutes.
  5. ldavg-15
    • System load average for the past 15 minutes.

iftop

1
2
yum install epel-release
yum install iftop
0%