# Case Study I: A Database Service

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1 Case Study I: A Database Service Prof. Daniel A. Menascé Department of Computer Science George Mason University 1 Copyright Notice Most of the figures in this set of slides come from the book Performance by Design: computer capacity planning by example, by Menascé, Almeida, and Dowdy, Prentice Hall, It is strictly forbidden to copy, post on a Web site, or distribute electronically, in part or entirely, any of the slides in this file. 2 1

2 DB Server Log Sample (msec) (count) (count) CPU Disk 1 Disk 2 TR ID OS Performance Measurements Resource CPU Disk 1 Disk 2 Utilization (%)

3 Basic Statistics for the DB Service Workload 5 Quantiles (quartiles, percentiles) and midhinge Quartiles: split the data into quarters. First quartile (Q1): value of Xi such that 25% of the observations are smaller than Xi. Second quartile (Q2): value of Xi such that 50% of the observations are smaller than Xi. Third quartile (Q3): value of Xi such that 75% of the observations are smaller than Xi. Percentiles: split the data into hundredths. Midhinge: Q 3 + Q Midhinge =

4 Example of Quartiles 1.05 Q Q Q Midhinge In Excel: Q1=PERCENTILE(<array>,0.25) Q2=PERCENTILE(<array>,0.5) Q3=PERCENTILE(<array>,0.75) 7 Example of Percentile percentile In Excel: p-th percentile=percentile(<array>,p) (0=p=1) 8 4

5 Range, Interquartile Range, Variance, and Standard Deviation Range: X max X min Interquartile Range: Q3 Q 1 not affected by extreme values. Variance: n 2 ( X i X ) 2 s = i = 1 n 1 In Excel: s 2 =VAR(<array>) Standard Deviation: In Excel: s=stdev(<array>) s = n ( Xi X ) i= 1 n Meanings of the Variance and Standard Deviation The larger the spread of the data around the mean, the larger the variance and standard deviation. If all observations are the same, the variance and standard deviation are zero. The variance and standard deviation cannot be negative. Variance is measured in the square of the units of the data. Standard deviation is measured in the same units as the data. 10 5

6 Coefficient of Variation Coefficient of variation (COV) : no units 1.05 S Average COV s / X 11 Box and Whisker Plots 12 6

7 Total No. of I/Os vs CPU Time 13 Result of Clustering Process Cluster Number CPU Time (msec) I/Os disk 1 I/Os disk 2 Npoints

8 QN for the DB Server 15 Building a Performance Model Need to apportion total resource utilizations to individual classes: U i, r = U i fi, r The apportionment factor depends on the type of resource. 16 8

9 CPU Apportionment Factor f f f f CPU, r CPU,1 CPU,2 CPU,3 = Total CPU Time Total CPU Time = = = = = = for classr for allclasses 17 Disk 1 Apportionment Factor f f f f disk i, r disk 1,1 disk 1,2 disk 1,3 Total no. I/Os on disk i by classr = Total no. I/Os on disk i for allclasses 8 50 = = = = = =

10 Disk 2 Apportionment Factor f f f f disk i, r disk 2,1 disk 2,2 disk 2,3 Total no. I/Os on disk i by classr = Total no. I/Os on disk i for allclasses = = = = = = Model Parameters Log total time 150 sec Total Throughput 1.33 Apportionment Factors Class 1 Class 2 Class 3 Total CPU Disk Disk Utilization Values Class 1 Class 2 Class 3 Total CPU Disk Disk Class throughput Service Demands Class 1 Class 2 Class 3 CPU Disk Disk

11 5.3.2 Computing Service Demands The model requires the per device, per class service demands, D i,r. The Service Demand Law (see Chapter 3) states that D i = U i /X 0. Applied to the current multi-class example, D i,r = U i,r /X 0,r. The utilizations, U i,r, are available from Table 5.4. The throughput for each class, X 0,r, is obtained by dividing the number of transactions processed for each class by the duration of the measurement interval. The number of transactions processed per class is given in the last column of Table 5.3. Thus, recalling the measurement interval of 150 seconds,

12 X X X 0,1 0,2 0,3 = 50/150 = 0.33 = 80/150 = 0.53 = 70/150 = 0.47 tps tps tps. Equation Using the multi-class device utilizations from Table 5.4 and the multi-class throughputs from Eq. (5.3.9), the multi-class service demands at each device are easily computed from the Service Demand Law, D i,r = U i,r /X 0,r. The results are shown in Table 5.5.

13 Table 5.5. Service Demand Values for All Classes (in sec) Class1 Class2 Class3 CPU Disk Disk

14 5.4 Using the Model The queuing network model of Fig. 5.4 is now completely parameterized using the service demands of Table 5.5 and the class arrival rates from Eq. (5.3.9). Note: The transaction arrival rates must equal the transaction completion rates (i.e., X 0,1, X 0,2, and X 0,3 ) since this is a lossless system and the flow into the database server must equal the flow out of the database server. The parameterized model is solved using OpenQN-Chap5.xls. The residence times for all classes and queues as well as the response time per class are shown in Table 5.6.

15 Table 5.6. Residence Times and Response Times for All Classes (in sec) Class1 Class2 Class3 CPU Disk Disk Response Time

16 As indicated in Table 5.6, response times for classes 2 and 3 are relatively high. Moreover, disk 1 is the resource where all classes spend most of their time. This is not surprising since disk 1 has the highest overall utilization (see Table 5.2). Thus disk 1 is the system bottleneck. From looking at Table 5.6, transactions from classes 1, 2, and 3 spend over 40%, 44%, and 67% of their time using or waiting to use disk 1, respectively. Note also that the ratios of the residence times at disk 1 to the corresponding service demand are quite high These ratios are 4.0 (,, ) for each class on disk 1.

17 In other words, the time a transaction spends on disk 1 is four times its total service time on that disk. Stated equivalently, a transaction's total waiting time at disk 1 is three times its total service time. In comparison, the corresponding waiting times at the CPU and disk 2 are only 0.8 and 1.9 times the class service times, respectively. Therefore, to improve performance (i.e., to reduce response times), the most effective strategy is to reduce the time spent on I/O and particularly at disk 1.

18 What-If Scenarios This baseline model can be used to evaluate relevant "what-if" scenarios. It has already been noted that performance would improve by upgrading the disk subsystem. Also, as the predicted workload intensity changes over time, an understanding of the predicted resulting performance is also important. For example, suppose that the workload intensity is predicted to change over the next ten months as indicated in Table 5.7. (Note that January's workload (i.e., X 0 = 1.33 tps) is the baseline workload intensity assumed up to this point.)

19 Table 5.7. Workload Intensity Prediction Month Arrival Rate January 1.33 February 1.45 March 1.68 April 2.26 May 2.68 June 3.25 July 3.98 August 4.78 September 5.74 October 6.76

20 5.4.1 Adding a Third Disk To cope with the increasing expected workload (i.e., Table 5.7) and to address the bottleneck, a new disk equivalent to the two existing disks is proposed to be added to the database server. The performance analyst also decides that the I/O activity should be balanced on the three disks to further improve I/O performance. Balancing the load is achieved by distributing the file requests across the three disks so that the service demand of any class is the same at all three disks. Thus, the new values of the service demands for disks 1 through 3 are computed as old old new Ddisk 1,r + Ddisk 2,r Ddisk i,r = for i = 3 1, 2,3. Equation

21 Table 5.8. Service Demand Values With a Third Disk Added (in sec) Class1 Class2 Class3 CPU Disk Disk Disk

22 The new response time values for the three classes are obtained with the help of OpenQN-Chap5.xls (Note: Remember to reinitialize the model to indicate that there are now four queues). The results are shown in the top part of Table 5.9 for the first five months (January-May) of the predicted new workload intensity levels. By looking at the first line in Table 5.9 (i.e., the January intensity of 1.33 tps) and comparing the class response times against the baseline metrics in Table 5.6, the effects of simply adding the third disk and balancing the I/O load across the disks results in over a 35% performance improvement (i.e., response time reduction). However, by May (i.e., workload intensity of 2.68 tps) the predicted performance is unacceptably poor, with class 2 anticipated response time exceeding 30 seconds.

23 Table 5.9. Response Times (in sec) for Various Scenarios Arrival Rate (tps) Response Time (sec) Class 1 Class 2 Class 3 Scenario: third disk added Scenario: 3 disks and a dual CPU Scenario: 3 disks 3x faster and a dual CPU Scenario: 3 disks 3x faster and a quad CPU

24 By looking at the ResidenceTimes worksheet of OpenQN-Chap5.xls, it is seen that with the third disk, the CPU is the resource where class 1 and class 2 transactions spend most of their time. That is, for these classes, the disks are no longer the bottleneck, but rather it is the CPU that is the most limiting the performance. To maintain an acceptable response time from, say April (i.e., 2.26 tps) on, it is necessary to reduce contention on the CPU. One alternative is to replace the current CPU with a faster processor. Another alternative is to upgrade the system to a multiprocessor by adding a second CPU. This second scenario is considered in the next subsection.

25 5.4.2 Using a Dual CPU System In order to maintain an acceptable QoS level past April, in addition to the extra disk and a balanced I/O load, an additional CPU is proposed in a dual CPU configuration. In order to analyze the effects of this change using OpenQN-Chap5.xls, the CPU queue is specified as MP2 (i.e., a multiprocessor with two CPUs). The results are shown in the middle of Table 5.9 for the April and May workloads (i.e., 2.26 tps and 2.68 tps). The largest reduction in response time, as expected, is for classes 1 and 2, the ones that spend more time at the CPU. However, the improvements are relatively minor and the response times are still very high for classes 2 and 3 for an arrival rate of 2.68 tps (i.e., May's workload). An analysis of the residence time breakdown indicates that with the dual CPU, all three classes spend most of their time at the disks. That is, adding the second CPU shifted the system bottleneck back to the disks. The next step is to improve disk access performance further.

26 5.4.3 Using Faster Disks A more dramatic upgrade is considered here to hopefully cope with the increasing workload intensities. Each disk is replaced by one that is three times faster. This is reflected in the model parameters by simply dividing the service demands on all disks by a factor of three. Solving the model with these new disk speeds yields the results shown in the middle lower half of Table 5.9. The results indicate that acceptable response times are obtained for an arrival rate up to 4.78 tps (i.e., through August). However, for 5.74 tps (i.e., September's workload), the response time for class 2 exceeds 10 seconds. A look at the residence times for class 2 reveals that 87% of its response time is being spent at the CPU. This indicates the need to further enhance the CPU.

27 5.4.4 Moving to a 4-CPU System In order to reduce the response time of class 2 transactions at high arrival rates, the dual CPU is replaced by a quad CPU. This change is reflected in the model by specifying the type of the CPU as MP4. The results are shown in the lower portion of Table 5.9. With this final upgrade, the model indicates that the response times are at acceptable service levels for all classes throughout the ten months period of concern. Figure 5.5 illustrates how the response time varies for class 2 transactions (i.e., those transactions that have the highest CPU and I/O demands resulting in the highest response times) for each of the scenarios. If a 10-second service level is deemed "acceptable" then an appropriate capacity planning strategy becomes apparent: 1) in January purchase an additional disk and load balance the load across the three disks by moving files, 2) in May exchange the disks for ones that are three times faster and purchase an additional CPU, 3) in September, purchase two additional CPUs. Though the parameters and time frames may change, this case study illustrates the usefulness of a quantitative analysis using queuing network modeling approach.

28 Class 2 Response Time for Various Scenarios 23 Hardware monitors Software monitors Accounting systems Program analyzers Hybrid Monitors Monitoring Tools Event-trace monitoring Sample monitoring 24 12

29 The Measurement Process Execution Environments for Application Programs The measurement of CPU utilization depends on the various software layers between the program and the bare machine

30 Execution Environments for Application Programs 27 Bare Machine Example Consider an early computer with no OS that executes one program at a time. During 1,800 sec, a hardware monitor measures a utilization of 40% for the CPU and 100 batch jobs are recorded. The average CPU demand for each job is: 0.4 x 1800 / 100 = 7.2 seconds 28 14

31 Execution Environments for Application Programs 29 OS Example Consider a computer system running batch programs and interactive commands. The system is monitored for 1,800 sec and a software monitor measures the CPU utilization as 60%. The accounting log of the OS records CPU times for batch and for the 1,200 executed interactive commands separately. From this data, the class utilizations are batch = 40% and interactive = 12%

32 OS Example (cont d) The CPU demand for the interactive class is given by D cpu,interactive U = t cpu X f cpu,interactive 0,interactive 0.6 [0.12/( )] = = 0.208sec 1200/ Execution Environments for Application Programs 32 16

33 TP Example A mainframe processes 3 workload classes: batch (B), interactive (I), and transactions (T). Classes B and I run on top of the OS and class T runs on top of the TP monitor. There are two types of transactions: query (Q) and update (U). What is the service demand of update transactions. 33 TP Monitor Example Measured by TP monitor Q U 120 sec140 sec Measured by accounting system Batch 32% Interactive 10% TP 28% Operating System Measured by OS Bare Machine 72% 34 17

34 TP Example (cont d) Measurements from the OS monitor during 1800 sec: CPU utilization is 72%. Measurements from the accounting facility: U U U os cpu, B os cpu, I os cpu, T = 32% = 10% = 28% 35 TP Example (cont d) Measurements from the program analyzer of the TP monitor: 1200 query transactions, which consumed 120 sec of CPU. 400 query transactions, which consumed 140 sec of CPU = /1800 D cpu, U = 0.698sec 36 18

35 Execution Environments for Application Programs 37 VM Example Measured by TP monitor Q U 1200 Q 120 sec of CPU total 400 U 140 sec of CPU total Measured by production OS monitor B 30% TP 60% Measured by VMM software monitor Production OS 50% Development Interactive OS OS 20% 14% Virtual Machine Monitor Measured by system monitor Bare Machine 97% 38 19

36 B 30% Q TP 60% Production OS 50% U VM Example (cont d) 1200 Q 120 sec of CPU total 400 U 140 sec of CPU total Development Interactive OS OS 20% 14% = /1800 D cpu, U = 0.933sec Virtual Machine Monitor Bare Machine 97% 39 B 30% Q TP 60% Production OS 50% U VM Example (cont d) 1200 Q 120 sec of CPU total 400 U 140 sec of CPU total Development Interactive OS OS 20% 14% Virtual Machine Monitor = /1800 D cpu, B = assuming that 80 batch jobs complete during the period. 4.33sec Bare Machine 97% 40 20

37 Computing the average concurrency level N = 50 =

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