Re: [PATCH 4/5] rteval: hackbench.py: Enable running on a system with low memory

[John Kacur <jkacur@redhat.com>]

On Wed, 1 Sep 2021, Punit Agrawal wrote:

> From: Punit Agrawal <punit1.agrawal@toshiba.co.jp>
> 
> The hackbench workload refues to run on RockPro64, a hexacore 64bit
> Arm board with 4GB memory, complaining about insufficient memory
> per-core.
> 
> On further investigation, it turns out that workload is using an
> arbitrary limit of 0.75 GB/core but will quite happily run on much
> lower lower memory systems.
> 
> Instead of preventing execution, convert the info message to a warning
> when the memory is lower than expected but continue execution. This
> should enable the workload to be used on a wider range of systems.
> 
> Signed-off-by: Punit Agrawal <punit1.agrawal@toshiba.co.jp>
> ---
>  rteval/modules/loads/hackbench.py | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/rteval/modules/loads/hackbench.py b/rteval/modules/loads/hackbench.py
> index 3b692070e9d9..ab028c495d8b 100644
> --- a/rteval/modules/loads/hackbench.py
> +++ b/rteval/modules/loads/hackbench.py
> @@ -55,9 +55,8 @@ class Hackbench(CommandLineLoad):
>          if ratio >= 0.75:
>              mult = float(self._cfg.setdefault('jobspercore', 2))
>          else:
> -            self._log(Log.INFO, "Low memory system (%f GB/core)! Not running" % ratio)
> +            self._log(Log.WARN, "Low memory system (%f GB/core)!" % ratio)
>              mult = 0
> -            self._donotrun = True
>  
>          sysTop = SysTopology()
>          # get the number of nodes
> -- 
> 2.32.0
> 
> 

I'm not sure that I can accept this. The number isn't entirely arbitrary, 
it's based on verifying machines as realtime capable for customers, in 
which case I'd rather it fails early. Maybe there is some other way to 
indicate that the user is okay with lower memory system, such as passing 
an --embedded flag or something of that nature?