Stress - system pressure simulation tool

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Preface

stress It is a tool for deliberately creating system pressure . It provides a series of parameters for configuring how to make CPU, Memory ,IO operation , Disk pressure .

install

# centos platform 
$yum install epel-release
$yum install stress

Parameter description

-c, --cpu N
    spawn N workers spinning on sqrt()
     start-up n individual worker Loop execution sqrt Calculation , Used to simulate cpu Type process 
-i, --io N
    spawn N workers spinning on sync()
     Loop execution sync, simulation io Type process 
-m, --vm N
    spawn N workers spinning on malloc()/free()
     Cycle call malloc and free Apply and release memory 
--vm-bytes B
    malloc B bytes per vm worker (default is 256MB)
     How much memory is requested each time 
--vm-stride B
    touch a byte every B bytes (default is 4096)
     One byte is forced to be read and written for every number of bytes , Avoid the application release of empty operation being optimized 
--vm-hang N
    sleep N secs before free (default none, 0 is inf)
     How long will the application be released 
--vm-keep
    redirty memory instead of freeing and reallocating
     Apply for release only once 
-t, --timeout N
    timeout after N seconds
     How many seconds to execute before exiting the program 
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stress Medium worker All of them are implemented through multiple processes , Every worker Is an independent child process .

Use scenarios

Examples of simulating various scenarios

# 8 individual cpu Type process ,4 individual io Type process ,2 A process that constantly requests to free memory , Every time you apply 128M Size memory ,10 After exit stress Program 
$stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10s

simulation cpu application

#  Turn on 1 individual cpu Type process 
$stress -c 1 -t 600
#  Turn on 8 individual cpu Type process 
$stress -c 8 -t 600

simulation io application

$stress -i 1 -t 600

other

About -i Parameter cannot simulate io High scene

This is because strss Is called by a loop sync Function to simulate io High scene .sync The function of is to write the buffer of all changes to the file to the file system .
However, if the system has little buffer for file changes , Then you can't simulate io High scene .
in addition , Because it is an endless loop call sync The function called by this system will cause cpu sys elevated .

sync Function description ： sync(2): commit buffer cache to disk - Linux man page

About implementation

stress The amount of code is small , only one 760 Yes c file , If you are interested or do not understand the parameters, you can directly look at the code .
There is a download link in the following page ： stress project page

Reference link

• stress(1): impose load on/stress test systems - Linux man page (https://linux.die.net/man/1/stress)

• Linux stress command - sparkdev - Blog Garden (https://www.cnblogs.com/sparkdev/p/10354947.html)

• Linux Stress testing software Stress Use guide - Beauty of operation and maintenance (https://www.hi-linux.com/posts/59095.html)

• System technology is not amateur research - Give you the Linux On the system stress (http://blog.yufeng.info/archives/2023)

• Linux Pressure test tools stress The parameters of - 51CTO.COM (http://os.51cto.com/art/201507/485967.htm)