System Performance Tools In debian

The system performance tool in debian-the Linux Release Technology-Debian information. The following is a detailed description. 1. View network traffic: iptraf

Common usage:
1) view the status of the specified NIC: iptraf-d eth0

2. view the network adapter's working rate. Mode: ethtool package
1) view: ethtool eth0
2) force the NIC to work in 1000 Mb/s full duplex mode and disable the adaptive function.
Ethtool-s eth0 speed 1000 duplex full autoneg off

3. Collect System Information: sysstat package, which contains the sar Tool
Common usage:
1) Check the CPU usage. sampling is performed once every 10 seconds. sampling is performed three times in a row. The result is stored in the file fw: sar-u 10 3-o fw.
Result:
% User: time percentage in user mode
% System: percentage of time in system Mode
% Iowait: Percentage of input/output wait time. If the value is too high, the system has an I/O bottleneck.
% Idle: Percentage of idle time

2) view the content in the binary file fw
Sar-u-f fw

3) Check the core status, sampling once every 10 seconds, and sampling three times consecutively: sar-v 10 3
Result:
Dentunusd:
File-sz: Number of table items in the file table being used or allocated in the current core controlled by the core parameter MAX-PROC
Inode-sz: Number of table items in the I node table being used or allocated in the current core controlled by the core parameter MAX-INODE
Super-sz:
% Super-sz:
Dquot-sz:
% Dquot-sz:
Rtsig-sz:
% Rtsig-sz:

4) view device usage: sar-d 10 3
Result:
DEV: block device name
Tps: Number of transmissions per second
Rd_sec/s: Number of read sector s. The size of one sector is 512 bytes.
Wr_sec/s: Number of write sector s. The size of one sector is 512 bytes.
Avgrq-sz: average request size
Avgqu-sz: average length of Request queue
Await: average usage time (Waiting Time + service time), in seconds
Svctm: Average service time
% Util: Percentage of CPU used by IO requests

5) cache zone usage: sar-B 10 3
Result:
Tps: Total number of transmissions per second
Rtps: Number of read requests per second
Wtps: Number of write requests per second
Bread/s: the number of physical blocks per second read from the hard disk into the system buffer.
Bwrtn/s: Average number of physical blocks written from the system buffer to the disk per second

6) network usage: sar-n {DEV | EDEV | NFS | NFSD | SOCK | ALL}
For example, sar-n DEV 5 10
Result:
Rxpck/s: number of packets received per second
Txpck/s: number of packets sent per second
Rxbyt/s: number of bytes received per second
Txbyt/s: number of bytes sent per second
Rxcmp/s: Number of compressed packages received per second
Txcmp/s: Number of compressed packages sent per second
Rxmcst/s: Number of multicast received per second



4. top
Common options:
NI: Nice value
VIRT: Virtual Image (kb)
RES: Resident size (kb)
SHR: Shared Mem size (kb)
NFLT: Page Fault count
Mcm t: Dirty Pages count

5. vmstat
Memory:
-- Swpd
-- Free
-- Buff
-- Cache
Swap
-- Si
-- So
Io
-- Bi. If it is large, it indicates that there are a large number of I/O requests that read disk content into the memory.
-- Bo
System
-- In
-- Cs
Cpu
-- Cs
-- Us
-- Sy
-- Id
-- Wa. If it is large, the CPU time is waiting for I/O operations.
6. iostat
Common usage: iostat-x 5 is updated every 5 seconds to display extended items

7. free
Omitted