colinianking / pagein

tool to force pages in

Pagein

Pagein is a tool that forces pages that are in swap to be paged in back to memory. The main usecase for pagein is to exercise the VM and swap subsystems for testing purposes.

pagein command line options:

• -a try to page in all processes.
• -h help
• -p page in process with process ID pid
• -v verbose mode

Example:

sudo pagein -a
Processes scanned:     271
Kernel threads:        130 (skipped)
Processes touched:     140
Pages touched:         1834340
Free memory decrease:  2233252K (558313 pages)
Swap memory decrease:  -27012K (-6753 pages)
Page faults major:     2850
Page faults minor:     468453
Swaps:                 0

pagein's Issues

Question for the stess-ng

Hi buddy,

How are u doing these days? I am investigating the stress-ng and got the following questions, could you please help to check ?

1, how should I know which stressors have the verify mode, are there any command to list those all?

Verify mode
Some stressors have a verification mode. A stress test is run and the results are checked, if the results are incorrect then stress-ng will flag up a warning error message. Suppose we want to run some exhaustive memory checks on a blob of virtually mapped memory via the vm stressor, enable the --verify mode and this will sanity check that the read/write results on the memory:

stress-ng --vm 1 --vm-bytes 2G --verify -v
Note that not all stressors have a verify mode, and enabling it will reduce the bogo op stats as there is an extra verification step being invoked.

2, The same as question 1, can I get the list for the stressors which have more than one method

Methods
Some stressors contain more than one method of causing stress. For example, the cpu stress test contains a wide range of ways to exercise a CPU; these are known as "methods". You can see all the methods using the "which" operator:

stress-ng --cpu-method which

3, some of the stressor could specify the load level, how can I figure out all of them
to support these opeartion?
stress-ng --cpu 0 -l 20