Skip to main content

Top command and options- Performance Measurement commands for Unix

Top command and options


What server side statistics should be gathered during performance testing. We have not yet looked in to specific statistics which we should gather for server side monitoring. In this post we would have a look at useful Linux commands which can be used to gather several important performance statistics. We would use these commands in future performance testing tutorials to gather server side performance statistics. Most of the description of these commands is from command manual. So lets begin -  

The top program provides a dynamic real-time view of a running system.  It can display system summary information as well as a list of processes or threads currently being managed by the Linux kernel.

Type the following command:

$ top
top.png

The top command used to display all the running and active real-time processes in ordered list and updates it regularly. Press ‘c‘ option in running top command, it will display absolute path of running process.
If you want to kill a running process then use kill command as - {kill -9 <process-id>}

Press (Shift+W) to save the running top command results under /root/.toprc.

OPTIONS

-u | -U  :User-filter-mode as:  -u | -U number or name
Display only processes with a user id or user name matching that given.  The '-u' option matches on  effective user whereas  the  '-U' option matches on any user (real, effective, saved, or filesystem).

Prepending  an  exclamation point ('!') to the user id or name instructs top to display only processes with users not matching the one provided.
$ top -u tarun
replace tarun with your username ;-)

top.png

-c  :Command-line/Program-name toggle Starts top with the last remembered 'c' state reversed. Thus, if top was displaying command lines, now that field will show program        names, and visa versa. See the 'c' interactive command for additional information. You can use this command to display absolute path of running process.
$ top -u tarun

top.png
-d  :Delay-time interval as: -d ss.t (secs.tenths) Specifies the delay between screen updates, and overrides the corresponding value in one's personal configuration file or the startup default.

$ top -d 1

No screen capture, try it yourself ;-)




Labels:

Comments

Post a Comment

Popular posts from this blog

JMeter Exceeded Maximum Number of Redirects Error Solution

While running performance test, JMeter allows maximum 5 redirects by default. However, if your system demands more than 5 redirects, it may result in JMeter exceeded maximum number of redirects error. In this post, we have listed down steps to overcome this error. Actual error in JMeter: Response code: “Non HTTP response code: java.io.IOException” Response message: “Non HTTP response message: Exceeded maximum number of redirects: 5” This error is noticed because  JMeter  allows maximum 5 redirects by default and your system may be using more than 5 redirects. You need to increase this count to more than 5 in jmeter.properties file. Follow below steps to achieve this. Navigate to /bin directory of your JMeter installation. Locate jmeter.properties file and open it in any editor. Search for “httpsampler.max_redirects” property in opened file. Uncomment the above property by removing # before it. Change to value to more than 5 Eg. 20. Save the file and restart JMet...
Post a Comment
Read more

SSO with SAML login scenario in JMeter

SAML(Security Assertion Markup Language) is increasingly being used to perform single sign-on(SSO) operations. As WikiPedia puts it, SAML is an XML-based open standard data format for exchanging authentication and authorization data between parties, in particular, between an identity provider and a service provider. With the rise in use of SAML in web applications, we may need to handle this in JMeter. This step-by-step tutorial shows SAML JMeter scenario to perform login operation. First request from JMeter is a GET request to fetch Login page. We need to fetch two values ‘SAMLRequest’ and ‘RelayState’ from the Login page response data. We can do this by using  Regular Expression Extractor . These two values need to be sent in POST request to service provider. Refer below image to see how to do this. We will get an HTML login page as a response to the request sent in 1st step. We need to fetch values of some hidden elements to pass it in the next request. We...
Post a Comment
Read more

VBScript Code - Function to convert CSV file into excel and viceversa in QTP using VBScript

We at times are required to convert excel files into csv to read as flat files and sometime require to convert a csv file into excel file to use excel features on the data.   Below function shows how to convert an csv file into excel file and vice versa. We can also convert to other formats based on constants Here constant value 23 is used to create a csv file and constant -4143 to save a file as xls file. Once the destination file is created, we can delete the source file as shown below.  In case of any issue in understanding the code, please add in comment section Call func_ConversionCSVExcel("E:\Test.csv", "E:\Test_converted.xls", "csvtoexcel") Public Function func_ConversionCSVExcel(strSrcFile, strDestFile, Conversion) on error resume next Set objExcel = CreateObject("Excel.application") set objExcelBook = objExcel.Workbooks.Open(strSrcFile) objExcel.application.visible=false objExcel.application.displayalerts=...
Post a Comment
Read more