Introduction to Linux under four Web Server stress test tools (http_load, Webbench, AB, Siege)

First, Http_load
The program is very small, after decompression is less than 100K
The http_load runs in parallel multiplexing to test the throughput and load of the Web server. However, unlike most stress testing tools, it can run in a single process and generally does not kill the client. You can also test site requests for HTTPS classes.

: http://soft.vpser.net/test/http_load/http_load-12mar2006.tar.gz

Installation
#tar ZXVF http_load-12mar2006.tar.gz
#cd http_load-12mar2006
#make && make Install

Command format: http_load-p number of concurrent access processes-S access time URL file to access
Parameters can be freely combined, and there is no limit to the choice between parameters. Like you wrote Http_load-parallel 5-seconds.
The urls.txt is also possible. Let's give you a brief explanation of the parameters.
-parallel Shorthand-P: means the number of concurrent user processes.
-fetches abbreviated-F: Meaning total number of accesses
-rate Shorthand-r: meaning the frequency of visits per second
-seconds shorthand-S: meaning Total access time
Prepare the URL file: urllist.txt, the file format is one url,url per line preferably more than 50-100 test results better. The file format is as follows:

Http://www.vpser.net/uncategorized/choose-vps.html

Http://www.vpser.net/vps-cp/hypervm-tutorial.html

Http://www.vpser.net/coupons/diavps-april-coupons.html

Http://www.vpser.net/security/vps-backup-web-mysql.html

For example:
Http_load-p 30-s Urllist.txt
Parameter understanding, let's look at running a command to see its return result
Command:%./http_load-rate 5-seconds The URLs description performed a test that lasted for 10 seconds, with a frequency of 5 per second.
Fetches, 2 max parallel, 289884 bytes, in 10.0148 seconds5916 mean bytes/connection4.89274
Fetches/sec, 28945.5 bytes/secmsecs/connect:28.8932 mean, 44.243 Max, 24.488 Minmsecs/first
-response:63.5362 mean, 81.624 Max, 57.803 minhttp response Codes:code 200-49

results analysis:

1. Fetches, 2 max parallel, 289884 bytes, in 10.0148 seconds
explains that 49 requests were run in the above test, the maximum number of concurrent processes is 2, the total data transferred is 289884bytes, The run time is 10.0148 seconds
2. 5916 mean bytes/connection shows the average amount of data transferred per connection 289884/49=5916
3. 4.89274 fetches/sec, 28945.5 bytes/sec
indicates that the response request per second is 4.89274, and the data passed is 28945.5 bytes/sec
4 per second. msecs/connect:28.8932 mean, 44.243 max, 24.488 min indicates that the average response time per connection is 28.8932 msecs, maximum response time 44.243 msecs, minimum response time 24.488 msecs
5. msecs/first-response:63.5362 mean, 81.624 max, 57.803 min
6, HTTP response Codes:code 200-49 describes the type of open response page, if 403 has too many types, That might

Be aware that the system is experiencing bottlenecks.
Special Instructions:
The main indicators in the test results are fetches/sec, Msecs/connect, which is the number of queries per second that the server can respond to, using this metric to measure performance. Seems to be a bit higher than Apache's AB accuracy and more persuasive.
Qpt-responds to user times per second and response time per connection.
The result of the test is mainly to look at these two values. Of course, only these two indicators do not complete the performance analysis, we also need to the server CPU, men analysis, in order to come to the conclusion

Second, Webbench

Webbench is a Web site stress testing tool under Linux that can simulate up to 30,000 concurrent connections to test the load capacity of a Web site. can go to google search, I am here to give a
: http://soft.vpser.net/test/webbench/webbench-1.5.tar.gz
This program is smaller, after decompression less than 50K, hehe

Installation
#tar ZXVF webbench-1.5.tar.gz
#cd webbench-1.5
#make && make Install
Generates the Webbench executable file in the current directory, which can be used directly

Usage:
Webbench-c Concurrent number-T run test time URL
Such as:
Webbench-c 5000-t http://www.163.com

Third, AB
AB is a powerful test tool from Apache
Apache has been installed in the general to bring their own,
Usage to view its description

$./ab
./ab:wrong Number of arguments
Usage:./ab [Options] [http://]hostname[:p Ort]/path
Options are:
-N requests number of requests to perform
-c concurrency number of multiple requests to make
-T TimeLimit Seconds to Max. Wait for responses
-P postfile File containing data to POST
-T Content-type content-type header for POSTing
-V verbosity how much troubleshooting info to print
-W Print out results in HTML tables
-I use HEAD instead of GET
-X attributes String to insert as table attributes
-Y attributes String to insert as TR attributes
-Z attributes String to insert as TD or TH attributes
-C attribute Add cookie, eg. ' Apache=1234. (repeatable)
-H attribute Add arbitrary header line, eg. ' Accept-encoding:gzip '
Inserted after all normal header lines. (repeatable)
-A attribute Add Basic WWW authentication, the attributes
is a colon separated username and password.
-P attribute Add Basic Proxy authentication, the attributes
is a colon separated username and password.
-X Proxy:port ProxyServer and port number to use
-V Print version number and exit
-K Use HTTP KeepAlive feature
-D do not show percentiles served table.
-S do not show confidence estimators and warnings.
-G filename Output collected data to gnuplot format file.
-e filename Output CSV file with percentages served
-H Display Usage information (this message)
There are many parameters, generally we use the-N and-C
For example:
./ab-c 1000-n http://www.vpser.net/index.php This represents processing 1000 requests at the same time and running the index.php file 100 times.

Iv. Siege
An open-source stress testing tool that allows multiuser concurrent access to a Web site based on configuration, recording the corresponding time for each user's request process, and repeating under a number of concurrent accesses.
Official: http://www.joedog.org/
Siege Download: http://soft.vpser.net/test/siege/siege-2.67.tar.gz
Extract:
# TAR-ZXF Siege-2.67.tar.gz
Go to unzip directory:
# CD siege-2.67/
Installation:
#./configure; Make
#make Install

Use
Siege-c 200-r 10-f Example.url
-C is the concurrency,-R is the number of repetitions. The URL file is a text, each line is a URL, it will be randomly accessed from the inside.

Example.url content:

http://www.licess.cn

Http://www.vpser.net

Http://soft.vpser.net

results description
Lifting the server siege ... done.
transactions:3419263 hits//Finish 419,263 processing
availability:100.00%//100.00% success rate
Elapsed time:5999.69 secs//Total time
Data transferred:84273.91 MB//Total data transfer 84273.91 MB
Response time:0.37 secs//spents 1.65 seconds: Shows the speed of network connections
Transaction rate:5 69.91 trans/sec//are processed 569.91 times per second: Indicates that the server is
throughput:14.05 mb/sec//Average data transfer per second
concurrency:213.42//actual maximum number of concurrent
Successful transactions:2564081//number of successful processes
Failed transactions:11//failure handling
Longest transaction:29.04// Maximum time spent per transfer
Shortest transaction:0.00//minimum time per transfer