Fill Memory

If you specify a usage that exceeds the total memory (e.g. > 100%) it fills up the memory as much as possible, as it's impossible to reach usages higher than 100%.

Use Cases

Test the system's ability to handle memory spikes.
Observe the system's behavior when it runs out of memory.
Observe the system's behavior when it runs low on memory for file buffers.

Parameters

Parameter	Description	Default
Duration	How long should memory be wasted?	30s
Mode	Fill and meet specified usage: Fill up the memory until the desired usage is met. Memory allocation will be adjusted constantly to meet the target. Fill the specified amount: Allocate and hold the specified amount of Memory.	Fill and meet specified usage
Size	Percentage of total memory or Megabytes	% of total memory

Useful Templates

See all

Fill Memory progressively of a Windows Host

Fill up the memory of a Host progressively to see at which percentage it becomes unstable. Additionally, you may want to add one of our observability checks.

Structure

We start by filling 50% of the host's memory for 30 seconds. Next, we stepwise fill the memory to 75%, 90%, and 100% - each for 30 seconds. In between, we have small wait steps to ease analysis in external observability tools for each phase.