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Linux system has a performance problem, generally we can use top, iostat, free, vmstat and other commands to view the initial positioning problems. Where iostat can provide richer IO performance status data.1. Basic use$iostat -d -k 1 10The parameter-D indicates that the device (disk) usage status is displayed; k Some columns that use block are forced to use kilobytes; 1 10 indicates that the data is refres
Tags: nload program tin files Disk IO int res page cacti1.1 IostatThe tools in the system Systat package are counted in kb/s, and 2 is counted as the frequency of 2 seconds:Iostat–x–k 2 10000 rrqm/s: How much of this device-related read request per second is being merge (when the system call needs to read the data, VFS sends the request to each FS, If FS finds that a different read request
Use Rate (%util), Response time (await) Iostat-c 1 #查看cpu状态Example AnalysisOstat-d-K 1 |grep sda10device: TPs kb_read/s kb_wrtn/s kb_read kb_wrtnsda10 60.72 18.95 71.53 395637647 1493241908sda10 299.02 4266.67 129.41 4352 132sda10 483.84 4589.90 4117.17 4544 4076sda10 218.00 3360.00 100.00 3360 100SDA10 546.00 8784.00 124.00 87
Linux IO Real-time Monitoring iostat command detailsIntroduction Iostat is mainly used to monitor the IO load of system devices. iostat displays the statistics from the start of the system when it is run for the first time. After iostat is run, statistics from the last run of the command are displayed. You can specify the number and time of statistics to obtain t
299.02 4266.67 129.41 4352 132SDA10 483.84 4589.90 4117.17 4544 4076SDA10 218.00 3360.00 100.00 3360 100SDA10 546.00 8784.00 124.00 8784 124SDA10 827.00 13232.00 136.00 13232 136As seen above, the average number of disk transfers per second is about 400, and the disk reads about 5MB per second and writes about 1MB.iostat-d-x-k 1device:rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkb/s wkb/s avgrq-sz avgqu-sz await
Use Rate (%util), Response time (await) Iostat-c 1 #查看cpu状态Example AnalysisOstat-d-K 1 |grep sda10device: TPs kb_read/s kb_wrtn/s kb_read kb_wrtnsda10 60.72 18.95 71.53 395637647 1493241908sda10 299.02 4266.67 129.41 4352 132sda10 483.84 4589.90 4117.17 4544 4076sda10 218.00 3360.00 100.00 3360 100SDA10 546.00 8784.00 124.00 87
Use Rate (%util), Response time (await) Iostat-c 1 #查看cpu状态Example AnalysisOstat-d-K 1 |grep sda10device: TPs kb_read/s kb_wrtn/s kb_read kb_wrtnsda10 60.72 18.95 71.53 395637647 1493241908sda10 299.02 4266.67 129.41 4352 132sda10 483.84 4589.90 4117.17 4544 4076sda10 218.00 3360.00 100.00 3360 100SDA10 546.00 8784.00 124.00 87
) = 0 Application available memory/system physical memory Monitoring tools Vmstat $ Vmstat 1 Procs ----------- memory ---------- --- swap -- ----- io ---- system -- ----- cpu ------ r b swpd free buff cache si so bi bo in cs us sy id wa st0 3 252696 2432 268 7148 3604 2368 3608 2372 288 288 0 0 21 78 10 2 253484 2216 228 7104 5368 2976 5372 3036 930 519 0 0 0 100 00 1 259252 2616 128 6148 19784 18712 1
DISK read:0.00 b/S | Actual DISK write:0.00 b/STID PRIO USER disk READ disk WRITE swapin io> COMMAND1 BE/4 root 0.00 b/S 0.00 B/s 0.00% 0.00% SYSTEMD--switched-root--system--deserialize 21 Free Free to view memory usage[Email protected] ~]# free-hTotal used fr
thesda10483.84 4589.90 4117.17 4544 4076sda10218.00 3360.00 100.00 3360 -sda10546.00 8784.00 124.00 8784 124sda10827.00 13232.00 136.00 13232 136As seen above, the average number of disk transfers per second is about 400, and the disk reads about 5MB per second and writes about 1MB.Iostat-d-x-k1DEVICE:RRQM/
0.000.000.0044.60 0.009.14419.82 1.6336.460.361.62dm-1 0.000.000.00 0.000.000.00 0.000.000.000.000.00For the example output above, we can obtain the following information:Write about 30M data (wkb/s value) to disk per second91 IO operations per second (R/S+W/S), with write as the principalAverage per IO request waits 120.57 milliseconds, processing time is 6.33
0.000.000.00 0.000.000.000.000.00For the example output above, we can obtain the following information:Write about 30M data (wkb/s value) to disk per second91 IO operations per second (R/S+W/S), with write as the principalAverage per IO request waits 120.57 milliseconds, processing time is 6.33 millisecondsIn the queue of IO
0.000.000.0044.60 0.009.14419.82 1.6336.460.361.62dm-1 0.000.000.00 0.000.000.00 0.000.000.000.000.00For the example output above, we can obtain the following information:Write about 30M data (wkb/s value) to disk per second91 IO operations per second (R/S+W/S), with write as the principalAverage per IO request waits 120.57 milliseconds, processing time is 6.33
IntroductionMost of the IO statistics tools under Linux, such as Iostat, Nmon, and so on, are only counted to the Per Device's read and write situations, and if you want to know how each process uses IO, it's a bit cumbersome.Iotop is a top class tool used to monitor disk I/O usage. Iotop has a UI similar to top, which includes information about PID, user, I/O, p
Vmstat 2 3Server status values, including server CPU usage, memory usage, virtual memory exchange, IO Read and write conditionscat/proc/$PID/ioView Read and write details for threadsIostat [Options] [Used to display detailed information about the storage subsystem, which is typically used to monitor disk I/O conditionsOption:-C CPU-D Device-N Network FileSystem-K Kilobytes-X Extended StatisticsDemo:iostat-d
10.6 Monitoring IO PerformanceIostat-x View disk Usage There is a very important indicator%util, the larger the value, the more the hard disk is occupiedIotop commands need to be installedIotop is also a dynamic display, focusing on the IO column10.7 Free Commandfree-m/-g/-h
Tags: http share sed roc wireshark res cause refresh informationMonitoring IO PerformanceUse the Iostat command to view disk usage [Email protected] ~]# iostat-x Here we focus on util This column,util is a percentage of the display, if the larger the value of your hard disk is more busy, this will be the reason for your system to become slowUse the
IntroductionMost of the IO statistics tools under Linux, such as Iostat, Nmon, and so on, are only counted to the Per Device's read and write situations, and if you want to know how each process uses IO, it's a bit cumbersome.Iotop is a top class tool used to monitor disk I/O usage. Iotop has a UI similar to top, which includes information about PID, user, I/O, p
10.6 Monitoring IO Performance[[emailprotected] ~]# iostat -xLinux 3.10.0-514.el7.x86_64 (aminglinux-001) 2018年01月22日 _x86_64_ (2 CPU)avg-cpu: %user %nice %system %iowait %steal %idle 4.87 0.00 8.42 14.51 0.00 72.20Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %utilsda 0.01 0.74 32.95
A good algorithm, implementation. Ultimately, I'm going to do IO.The use of traditional mechanical hard disk, the storage of big data is also OK, but the database content acquisition is really poor to a realm. Here is an exploration:Disk Performance:Before we understand the disk I/O monitoring command iostat, we need to understand the metrics for
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