databricks delta

Explanation of the iostat command bitsCN. comiostat result parsing [Root @ 20081006-1724 ~] # Iostat-xLinux 2.6.9-78. ELsmp (20081006-1724) 11/20/2009 Avg-cpu: % user % nice % sys % iowait % idle0.19 0.00 0.04 0.03 99.73 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm % utilSda 0.05 17.60 1.46 7.72 80.69 202.57 40.34 101.29 30.87 0.01 1.06 0.37 0.34Sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 29.90 0.00 3.14 3.14 0.00Sda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0

0.51 0.34 8.40 32.20 0.00 1.19 0.58 0.03 sda6 0.00 0.00 0.00 0.12 0.00 0.48 8.18 0.00 5.02 4.53 0.05 sda7 0.00 0.00 0.00 0.00 0.00 0.00 45.00 0.00 sda8 5.52 3.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00. 88 0.00 7.62 6.03 0.00 sda9 0.00 0.00 0.00 0.00 0.00 0.00 39.71 0.00 7.37 5.83 0.00 sda10 0.00 0.00 0.00 0.00 0.00 0.00 37.57 0.00 sda11 5.70 3.54 0.00 0.00 11.74 0.01 0.76 0.08 49.97 131.48 0.01 10.74 0.57 0.04 sdb 0.01 3.91 20.24 20.21 1262.95 1853.94 154.09 0.52 12.84 1.97 7.95 rrqm/s: the number

94.10 0.00 1024.00 3.84 20.42 4.98 93.68Dm-14 0.00 0.00 185.20 0.00 92.60 0.00 1024.00 3.75 20.27 5.01 92.79Dm-13 0.00 0.00 180.00 0.00 90.00 0.00 1024.00 3.70 20.55 5.07 91.17Dm-13 0.00 0.00 441.40 0.00 3.45 0.00 16.00 5.13 11.62 2.26 99.91Dm-14 0.00 0.00 415.20 0.00 3.24 0.00 16.00 4.82 11.60 2.41 99.92Dm-13 0.00 0.00 422.70 0.00 3.30 0.00 16.00 4.93 11.66 2.36 99.89Dm-14 0.00 0.00 424.80 0.00 3.32 0.00 16.00 5.02 11.81 2.35 99.83Dm-13 0.00 0.00 426.80 0.00 3.33 0.00 16.00 4.99 11.69 2.34 99.

company feels that raid5 is changed to raid1 + 0. In the end, I don't get the answer to my question. If any of you have any insights, I can give you some advice. Introduction: ========================================================== ================== ================================ Iostat ======== ========================================================== ==================Rrqm/s: the number of merge read operations per second. That is, delta (rm

await SVCTM%util Xvda 0.02 0.69 0.56 113.65 13.80 713.21 12.73 0.00 0.03 0.48 5.53xvdb 0.02 17.88 1.07 18.19 21.24 144.27 17.19 0.13 6.71 1.69 3.25device:rrqm/s wrqm/s r/s w/s rkb/s wkb/s avgrq-sz avgqu-sz await SVCTM%utilxvda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00XVDB 0.00 0.00 0.00 5.00 0.00 20.00 8.00 0.11 22.00 4.40 2.20device:rrqm/s wrqm/s r/s w/s rkb/s wkb/s avgrq-sz Avgqu-sz Await SVCTM%utilxvda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

0.76dm-2 0.00 0.00 0.00 0.01 0.00 0.02 8.00 0.00 5.41 3.28 0.00 RRQM/S: The number of read operations per second for the merge. That is Delta (rmerge)/s WRQM/S: The number of write operations per second for the merge. That is, Delta (wmerge)/s R/S: Number of Read I/O devices completed per second. Delta (RIO)/s

, V = (V1, V2), W = (W1, W2 ); This definition can be applied from two-dimensional space to three-dimensional and other high-order spaces. We know that p (x, y) on a two-dimensional plane rotates an angle α on the coordinate axis, and the new coordinate is P (xnew, ynew) If the distance from point P is R, and the angle between the point and the original X axis is delta X = rcos delta, y = rsin

[Root @ 20081006-1724 ~] # Iostat-xLinux 2.6.9-78. elsmp (20081006-1724) 11/20/2009 AVG-CPU: % USER % nice % sys % iowait % idle0.19 0.00 0.04 0.03 99.73 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s RKb/s WKB/s avgrq-SZ avgqu-SZ await svctm % utilSDA 0.05 17.60 1.46 7.72 80.69 202.57 40.34 101.29 30.87 0.01 1.06 0.37 0.34Sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 29.90 0.00 3.14 3.14 0.00Sda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 16.25 0.00 1.51 1.30 0.00Sda3 0.05 17.60 1.46 7.72 80.69 202.57

number of times statistics are made based on the specified interval of interval. Use the vmstat and iostat commands to monitor Linux Performance RH442 strategy-iostat Use the iostat command in Linux to generate a statistical report on CPU and I/O Install iostat and mpstat Brief description of Linux iostat command output Linux iostat command Linux iostat command instance details1.4.3 result description Simple Application of Iostat Iostat disk monitoring Rrqm/s: the number of merge read oper

percentage of time that the CPU or CPUs were idle and the system did not have an outstanding disk I/O request. Rrqm/s: the number of merge read operations per second. That is, delta (rmerge)/s wrqm/s: Number of write operations performed on merge per second. That is, delta (wmerge)/s r/s: The number of read I/O devices per second. That is, delta (rio)/s w/s: the

0.00 0.89 0.88 0.03 sde 0.01 0.14 0.31 0.54 5.64 5.45 12.98 0.00 3.29 sdf 2.16 0.18 0.00 0.00 0.02 0.00 0.24 0.02 11.28 0.00 2.49 2.38 0.01 sdg 0.16 0.00 1.00 0.63 2.90 5.01 4.86 0.00 0.84 0.45 sdg1 0.07 0.00 0.00 0.05 0.00 0.11 0.00 2.21 0.00 0.07 sdg2 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.67 0.00 0.00 0.00 sdg5 0.01 0.00 0.05 0.31 0.14 2.49 7.29 0.00 1.50 1.50 0.05 sdg6 0.00 0.00 0.05 0.00 0.24 0.01 4.65 0.00 0.49 0.49 sdg7 0.00 0.01 0.00 0.05 0.31 0.12 2.49 7.33 0.00 1.10 sdg8 1.10 0.04

5.83 0.00 sda10 0.00 0.00 0.00 0.00 0.00 0.00 37.57 0.00 sda11 5.70 3.54 0.00 0.00 11.74 0.01 0.76 0.08 49.97 131.48 0.01 10.74 0.57 0.04 sdb 0.01 3.91 20.24 20.21 1262.95 1853.94 154.09 0.52 12.84 1.97 7.95 rrqm/s: the number of merge read operations per second. That is, delta (rmerge)/swrqm/s: Number of merge write operations per second. Delta (wmerge)/sr/s: the number of read I/O devices per second. Tha

0.00SDA5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00Sda6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00SDA7 0.00 7.00 0.00 16.00 0.00 92.00 11.50 0.06 3.44 3.44 5.50 rrqm/s: The number of read operations per second for the merge. That is, the delta (rmerge)/s wrqm/s: the number of write operations per second for the merge. That is, Delta (wmerge)/s r/s : the number of read I/O devices

. 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 SVCTM%utilSDA 1.56 28.31 7.84 31.50 43.65 3.16 21.82 1.58 1.19 0.03 0.80 2.61 10.29SDA 1.98 24.75 419.80 6.93 13465.35 253.47 6732.67 126.73 32.15 2.00 4.70 2.00 85.25SDA 3.06 41.84 444.90 54.08 14204.08 2048.98 7102.04 1024.49 32.57 2.10 4.21 1.85 92.24 You can see the average response time of the disk Extended:rrqm/s:The number of read operations for the merge per second.

)Example 4: View device usage (%util) and response time (await)---disk performance statistics/root$iostat-d-x-k 1 1Linux 2.6.32-279.el6.x86_64 (Colin) 07/16/2014 _x86_64_ (4 CPU) Device: rrqm/s wrqm/s r/s w/s rkb/s wkb/s avgrq-sz avgqu-sz await SVCTM %UTILSDA 0.02 7.25 0.04 1.90 0.74 35.47 37.15 0.04 19.13 5.58 1.09dm-0 0.00 0.00 0.04 3.05 0.28 12.18 8.07 0.65 209.01 1.

number of random disk access or disk bandwidth caused by, Bi, Bo also more than 1024k, should have encountered an IO bottleneck. 2.2 Iostat The following is a more professional disk IO diagnostic tool to see the relevant statistics. its related fields are described below: RRQM/S: The number of read operations per second for the merge. Delta (rmerge)/swrqm/s: The number of write operations per second for the merge.

we give the results first, then the derivation:\[\frac{\partial}{\partial\theta_{ij}^{(L)}}j (\theta) = \frac{1}{m}\sum_{t=1}^{m}\delta_i^{(t) (l+1)}a_j^{(t) (l)} + \frac{\lambda}{m}\sum_{l=1}^{l-1}\sum_{i=1}^{s_l}\sum_{j=1}^{s_l+1} (\theta_{ji}^{(L)}) \tag{3}\]which\[\begin{cases}\delta^{(L)} = a^{(l)}-y \\\delta^{(L)} = \delta^{(l+1)}* (\theta^{(l+1)}) ^t*g '

Copy Code code as follows: /** event handler for mouse wheel event. * Mouse Scrolling Event */ var wheel = function (event) { var delta = 0; if (!event)/* for IE. */ event = window.event; if (Event.wheeldelta) {/* ie/opera. */ Delta = event.wheeldelta/120; else if (event.detail) { /** Mozilla case. */ /** in Mozilla, sign of Delta are different th

Tags: linux mysql io too highThe recent MySQL machine io is too high to keep the storage slow, and here is the process of solving and problem finding.First to see the WA higher, WA means that the CPU spends waiting for IO on the ratio, and then through the Iostat-x 2 see as,rrqm/s:The number of read operations for the merge per second. Delta (rmerge)/swrqm/s:The number of write operations per second for the merge. That is,

the merge. That is, Delta (rmerge)/swrqm/s # The number of write operations per second for the merge. That is, Delta (wmerge)/sr/s # Number of read I/O devices completed per second. That is, the number of write I/O devices completed per second by Delta (Rio)/SW/S #. That is, the Delta (wio)/srsec/s # r