cache level test /L1/L2 about stress-ng HOT 5 CLOSED

Hi there,

Stress-ng tries to determine the cache size from information provided by the available kernel interfaces. Some systems don't provide this information so stress-ng cannot determine this. One needs to look this up manually using the processor details and provide it via the --cache-size option, for example:

stress-ng --cache 0 --cache-size 32K

Hope that helps.

from stress-ng.

Great, thanks!
I check, and see option of l1-cachesize
Stress-ng --cache 0 --l1cache-size 128K -t 1m
But I could not find l2cache-size. stress-ng --cache 0 --l2cache-size 128K -t 2m
stress-ng: unrecognized option '--l2cache-size'

Check the source code, it has only stress-l1cache.c, not l2.
Is there cmd to dump cache info such as calling stress_get_all_cpu_cache_details?

from stress-ng.

The --l1-cachesize option applies to just the l1cache stressor which is entirely different from the cache stressor.

use: stress-ng --cache 0 --cache-size 128K -t 1m

The cache stressor performs some pathologically awful read/write patterns and for x86 processors can exercise a wide range of cache related CPU operations. The l1cache stressor is designed to just exercise cache evictions and is a different cache stressor use case to the cache stressor.

from stress-ng.

from stress-ng.

Yes, as long as you know the ARM processor cache size. Some Linux ARM systems provide cache information in their device tree and this can be presented to user space programs, however, some don't, such as your device, in which case you need to supply the cache size to the stress-ng cache stressor.

from stress-ng.