1. View Linux detailed version informationFile/sbin/init2. Download the corresponding Nmon versionhttp://pkgs.repoforge.org/nmon/3. InstallationRPM-IVH nmon-14f-1.el5.rf.i386.rpm4. acquisition of data1)./nmon_x86_rhel52-s10-c60-f-M.The-S10 collects
1. Concept Description: DNS resolution Time: Displays the time required to resolve DNS names to IP addresses using the closest DNS server; The DNS lookup metric is a good indicator of DNS resolution issues or DNS server problems;Connect time:
GLM Generalized linear model
George Box said: "All models is wrong, some is useful" 1. Starting with the Linear Model
As a foundation of GLM, this section review the classic Linear Regression, and expounds some basic terms.The basic formula for our
Add Windows and Linux presses in combatSince the controller is the "heart" of the LoadRunner, the pressure is generated by it, and pressure is generated by the pressure machine to the system under test. General presses are divided into Windows and
First, the script recording1. Select the Web Services protocol and click the Record button2. Click the Import button to import the URL you want to record3. Select Action, click Add Service Call, select the correct service, operation and interface
First, when doing the Java interface Performance test, the scene appears in the operation: Code-60990 error:two communication error:function Two_way_comm_post_message/two_way_ COMM_POST_MESSAGE_EX failed. Errorand Code-10343 error:communication
Problem phenomenon:ACTION2.C (+): error-26601:decompression function (Wgzmemdecompressbuffer) failed, return code=-5 (z_buf_error), Insiz E=0, Inuse=0,This error is caused by a large packet, no download complete, or other reason for the
I. Functions
Search for HTML code on a web page
Ii. Function Attributes
1. Text: the string to be searched. For example, text = "Search"
2. textpfx: left boundary of the search term
3. textsfx: right boundary of the search term
4. Search: search
Guidance:
Memory: memory usage may be the most important factor in system performance. If the system frequently switches pages, the memory is insufficient. "Page Swap" is a unit called "page". It moves code and data blocks of a fixed size from Ram
Okay! Next to the previous articleArticleAnd keep moving forward.
Checkpoint: For a simple understanding, we have parameterized the user name and password as described in the previous chapter. How can we determine whether jmeter correctly calls
Someone has doubts about this data. Let's talk about it here.
We know that when a controller error occurs, you can click the number of errors in the upper-right corner.
The data is displayed in the pop-up error output. As follows:
Transactions (User transaction analysis)
User transaction analysis is a basic performance analysis from the user's perspective.
1. Transation Sunmmary (transaction summary)
Comprehensive analysis of transactions is the first step in performance
I. Preface
Obviously, we can know from the name that vmstat is a tool for viewing the usage of Virtual Memory. But how can we identify bottlenecks in the system through vmstat? Before answering this question, let's review the virtual memory related
This is really a tragedy.
During the installation of lr9.1, the system prompts that the putty. GID file cannot be found, and the system prompts that the *. gif. tmp file cannot be found later. These files are all irrelevant small files. Every error
Let's take a look at it.
First, we need to monitor
% Processor time (processor_total ):
The maximum limit is
% USER time (processor_total ):
. If the value is high, considerAdd indexes and try to use simple table join and horizontally
Lr_eval_string ()
Function: returns the current value of a parameter in the script,
Return Value Type: Char
Generally, the parameter value is output when the script is debugged. The usage is as follows:Lr_output_message ("The parameter1's
There are two ways to perform text check points in http:
Method 1: correlation value judgment
// This method is often used to take the initiative to find trouble, but it cannot be used to check the function, you can consider using this
DNS resolution time: displays the time required to use the latest DNS server to resolve the DNS name to an IP address. The DNS search measurement is a good indicator indicating a DNS resolution problem or a DNS server problem;Connect time: displays
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