Performance Testing Tools

In Python follow the steps to install other packages on windows: For example:  >>> import requests Traceback (most recent call last):   File "<pyshell#1>", line 1, in <module>     import requests ImportError: No module named requests To resolve this error: 1.      Go to this website https://pypi.python.org/pypi , Search  for the required package, here requests and pick the tar.gz file which you think is the latest. 2.      Open the tar.gz (requests-2.4.3.tar.gz) using 7zip or winrar or any other archive manager. 3.      There is a folder called "dist' inside the above tar.gz. 4.      Inside 'dist' folder there will be a ".tar" file named "requests-2.4.3.tar". Please note that this is the latest version when I downloaded the file. 5.      Double click the "requests-2.4.3.tar" file as mentioned above. You will find a folder with the same name “requests-2.4.3". Extract this fold

Common list of Bottlenecks: CPU: CPU overload Context switches ->  too many threads on a core,  bad luck with the linux scheduler  too many system calls, etc... IO waits -> all CPUs wait at the same speed CPU Caches: Caching data is a fine grained process, in order to find the right balance between having multiple instances with different values for data and heavy synchronization to keep the cached data consistent. Backplane throughput Network: NIC maxed out, IRQ saturation, soft interrupts taking up 100% CPU DNS lookups Dropped packets Unexpected routes with in the network Network disk access Shared SANs Server failure -> no answer anymore from the server Memory: Out of memory -> kills process, go into swap & grind to a halt Out of memory causing Disk Thrashing (related to swap) Memory library overhead Memory fragmentation In Java requires GC pauses In C, malloc's start taking

Code to Generate random Name (10 character) and Credit Card (16 digits) and Save them to a .csv file along with Last_four digits of credit card Under Vuser_init.c Add the function random_ vuser_init () {      return   0 ; }      char  buff[ 32 ] =  "" ;        random_name ( int  length) {    int  r,i;    srand (( unsigned   int ) time ( 0 ));  //Seed number for rand()   r =  rand () %  25  +  65 ;  //uppercase for Initial Letter   buff[ 0 ] = ( char )r;    //Loop to generate random small characters    for  (i =  1 ; i < length; i++) {      // A-Z = 65-90 && a-z =  97-122       r =  rand () %  26  +  97 ;  //lowercase     buff[i] = ( char )r;      }    return   0 ; }    Code which goes into Action() Action () { int  i; char  *file1 =  "C:\\temp\\sample.csv" ; long  filename1; unsigned   long  num; char  randnum1[ 10 ], randnum2[ 20 ]; char  name[ 20 ]; const   char  *last_four; srand ( time (NULL)); filename1=

I have a Parameter. I want to increase the parameter value by 1. Below is the code to capture the parameter and increment it by 1. Action () { long   double  i;    lr_save_string ( "1234567899" ,  "id" ); i =  atol ( lr_eval_string ( "{id}" )); i =i+ 1 ;    lr_save_int (i,  "id" ); lr_output_message ( "Value is: %s" ,  lr_eval_string ( "{id}" )); return   0 ; } Output: Starting action Action. Action.c(12): Value is: 1234567900 Ending action Action. Ending Vuser... If we increase the Length of parameter by one more digit (here 11 digits).  The below logic fails as shown below. L L Action () { long   double  i;    lr_save_string ( "12345678999" ,  "id" ); i =  atol ( lr_eval_string ( "{id}" )); i =i+ 1 ;    lr_save_int (i,  "id" ); lr_output_message ( "Value is: %s" ,  lr_eval_string ( "{id}" )); return   0 ; } Starting a

Tool : PerfAnalyzer This tool developed internally for analyzing the output of Glance, nmon and GC Logs. The tool has three tabs: 1.        Glance Analyzer 2.        Nmon Analyzer 3.        GC Analyzer Glance Analyzer: This is used to analyze the output of Glance command. It is sub-divided into two tabs: 1.        Off-line Mode :  To analyze the saved Glance output 2.        Online Mode : To analyze the Glance Logs online while the test is running. (Enhancements in Progress) Inputs required: Glance output file. Output obtained : Graph outputs of CPU Utilization, Memory Utilization, Disk Utilization and Swap Utilization. Also gives Min, Max and Avg values for CPU, Memory and Disk Usage. Nmon Analyzer: This is used to analyze the output of nmon command. Inputs required: nmon output file. Output obtained : Graph outputs of CPU Utilization, Memory Utilization, Disk Utilization and Network Utilization. System summary gives CPU Info

Finding memory problems: When performance testing a java application and want to identify memory problems, below steps will help: 1.    Don’t call it “memory leak” until you are 100% sure-make your program manager jump up and down. (A better term “unaccountable heap usage”, etc.) 2.    There is probably some “unaccountable heap size” from each release, there is no need and no time to look for small ones. Concentrate on the large ones which could cause problem down the road. 3.    There are some caches which is not leakage-watch out for their growth in size. Also check for some session data, which might be cleaned up after user logoff. 4.    Run 72-90 hour stability test under load for each release, monitoring java heap size. Check java heap GC frequency and old gen size. (cat “Full GC” myServer.log |awk ‘/Full GC/ {getnextline; getnextline;getnextline;print $0}’ | awk ‘{print $4}’) 5.    Enable GC Logging in JAVA_OPTIONS by adding appropriate flags: "

Correlation and checking In Previous post we have randomly selected value for depart and arrive. Each Depart and arrive have a outboundFlight and returnFlight field, which changes according to the selected values. For E.g.: When we recorded the script with depart as “London” and arrive as “Paris” the below flight details was recorded accordingly to the selection.      /*web_submit_form("reservations.pl_2",          "Snapshot=t5.inf",          ITEMDATA,          "Name=outboundFlight", "Value=241;97;03/28/2014", ENDITEM,          "Name=returnFlight", "Value=422;102;03/29/2014", ENDITEM,          "Name=reserveFlights.x", "Value=26", ENDITEM,          "Name=reserveFlights.y", "Value=8", ENDITEM,          LAST); */ As we see above the outboundFlight and returnFlight is hard coded and needs to be correlated according to the selected value. So inserting the c

How to choose a value randomly from the list For demonstrating the example, we will use the sample application (HP Web Tours Application).  This application shows a sample where we can book flight tickets. The options in depart and arrive are shown as below: web_submit_data ( "reservations.pl" ,          " Action = http://127.0.0.1:1080/cgi-bin/reservations.pl " ,          " Method = POST " ,          " RecContentType = text/html " ,          " Referer = http://127.0.0.1:1080/cgi-bin/reservations.pl?page = welcome " ,          " Snapshot = t4.inf " ,          " Mode = HTML " ,          ITEMDATA ,          " Name = advanceDiscount " ,  " Value = 0 " ,  ENDITEM ,          " Name = depart " ,  " Value = London " ,  ENDITEM ,          " Name = departDate " ,  " Value = 03/28/2014 " ,  ENDITEM ,          " Name = arrive " ,  "