Re: Debian-13 bad performance on IPC

On 03/07/26 at 18:27, Ralf Fassel wrote:
> - When receiving a START signal, data are stored to SSD, and an analysis
>    program is started.  The analysis program in turn starts several
>    sub-processes, which in turn start several sub-sub-processes.
>    All sub-sub-processes read the recorded data files in a "tail -f" fashion.

I suspect hardware issue with your IPC, maybe not all cores of the I7 
cpu are used since the IPC is fan-less. Shooting in the dark, try a 
different scheduler, the kernel 6.12.x comes with three scheduler: 
deadline (the default), kyber and bfq. To see the available scheduler 
simply run:

# cat /sys/block/sda/queue/scheduler

change "sda" according to your SSD device, to try another scheduler run:

# echo bfq >/sys/block/[TheSSD]/queue/scheduler

If you want to know more about Linux kernel scheduler looks at 
"linux-source-6.12/Documentation/block/" directory of the kernel sources.

Kind regards,