Messages in this thread | | | Date | Wed, 1 Apr 2015 11:37:10 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH 0/5] Support negative number of CPUs |
| |
On Wed, Apr 01, 2015 at 01:20:31AM +0200, Frederic Weisbecker wrote: > Support for machines without any CPU at all was brought 3 years ago > by Paul (https://lkml.org/lkml/2012/3/31/131). The goal was to reduce > the complexity of programming on modern computing. > > Now meeting the simplicity beyond that of sequential programming had a > cost: such hardware configuration found a user base but didn't meet much > success among HPC users. > > So we have now a new challenge to solve: keep the beyond-sequential > programming simplicity while providing a highly parallel processing that > still scale. > > This patchset proposes a solution. The support for negative number of > CPUs is able to help scale computing up to O(-NR_CPUS). The more you have > CPUs the higher you scale, to the point that software execution should > complete before you start writing that software (assuming you have around > -1024 CPUs). And programming gets even more simple because you have lesser > CPUs to handle. > > Now keep in mind this patchset is only a draft. Not build tested and > I don't have the hardware yet. > > Frederic Weisbecker (5): > cpu: Infrastructure for negative cpu handling > smp: IPI handling for negative CPU > cpumask: Basic negative number of CPUs handling > init: Support negative CPUs boot and halt code > x86: Support reverse execution
I have been wanting a feature like that since forever! Thanks for doing this Frederic.
I'd like to propose an addition to that feature: execute whole programs backwards. But should be easily doable with patch 5 in the series.
Acked-by: Borislav Petkov <bp@alienski.de>
-- Regards/Gruss, Boris.
ECO tip #101: Trim your mails when you reply. --
| |