Linux 60秒快速性能分析操作手册(4)

Linux

比如 内存不足引发OOM和TCP 的丢弃`请求的记录。

┌──[root@vms83.liruilongs.github.io]-[~]
└─$cat /var/log/messages | grep -i memory
Aug 10 20:37:27 vms83 kernel: [<ffffffff81186bd6>] out_of_memory+0x4b6/0x4f0
Aug 10 20:37:27 vms83 kernel: Out of memory: Kill process 25143 (bigmem) score 1347 or sacrifice child

TCP 的相关日志甚至指引了我们下一步的分析方向:查看SNMP 计数器值。

vmstat 1

┌──[root@liruilongs.github.io]-[~]
└─$man vmstat
VMSTAT(8)                                       System Administration                                       VMSTAT(8)
NAME
       vmstat - Report virtual memory statistics
SYNOPSIS
       vmstat [options] [delay [count]]
DESCRIPTION
       vmstat reports information about processes, memory, paging, block IO, traps, disks and cpu activity.
       The first report produced gives averages since the last reboot.  Additional reports give information on a sam‐
       pling period of length delay.  The process and memory reports are instantaneous in either case.
       ..........................

┌──[root@vms100.liruilongs.github.io]-[~]
└─$vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
69  0      0 7700836   4204 1441648    0    0   369   101  569 1819 11 35 45  8  0
26  1      0 7711264   4204 1441668    0    0     0    12 1209 1380  9 24 64  3  0
 8  0      0 7710592   4204 1441664    0    0     0    27  779 1215  4 11 78  7  0
13  0      0 7699752   4204 1441668    0    0     0     0  766 1313  3 25 72  0  0
31  0      0 7696384   4204 1442288    0    0     0  1412 1157 2928 12 32 49  8  0
60  0      0 7675296   4204 1444292    0    0     0    26 1068 13824  9 26 51 14  0
34  0      0 7670552   4204 1444280    0    0     0    17  798 1514 14 52 34  1  0
60  1      0 7686712   4204 1444508    0    0     0     8  807 2127  6 24 67  3  0
59  2      0 7676624   4204 1445232    0    0     0     8  620 6830  7 66 22  5  0
68  0      0 7677948   4204 1442440    0    0     0    56 1329 3739 13 22 59  7  0
100  0      0 7677920   4204 1442340    0    0     0    21 1030 3778 16 50 29  5  0
19  0      0 7669208   4204 1443220    0    0     0    43  958 3054 19 65 10  6  0
 5  2      0 7776028   4204 1445364    0    0     0    40 1124 20039 18 33 44  4  0
84  1      0 7764600   4204 1447240    0    0     0    36  867 23470 14 53 27  5  0
22  0      0 7711224   4204 1447328    0    0     0   112 1353 11900 13 34 50  4  0
36  0      0 7734856   4204 1447572    0    0     0   321 1382 11113 10 22 47 21  0
28  1      0 7738716   4204 1446508    0    0     0   157  889 5779  3 15 64 18  0
30  0      0 7719320   4204 1446696    0    0     0   151 1409 8526  5 27 57 10  0
 7  1      0 7713972   4204 1447192    0    0     0    25 1372 23431 13 19 63  5  0
18  0      0 7715444   4204 1447356    0    0     0    56  935 7750  6 19 67  7  0
54  0      0 7766760   4204 1440632    0    0     0    64 1237 4686 11 26 56  7  0
52  0      0 7712752   4204 1441816    0    0     0     4 1265 6567 25 33 42  0  0
^C
┌──[root@vms100.liruilongs.github.io]-[~]
└─$