[Beowulf] New Spectre attacks - no software mitigation - what impact for HPC?
e.scott.atchley at gmail.com
Tue Jul 17 06:38:24 PDT 2018
I saw that article as well. It seems like they are targeting using RISC-V
to build an accelerator. One could argue that you do not need speculation
within a GPU-like accelerator, but you have to get your performance from
very wide execution units with lots of memory requests in flight as a GPU
On Tue, Jul 17, 2018 at 8:19 AM, John Hearns via Beowulf <
beowulf at beowulf.org> wrote:
> This article is well worth a read, on European Exascale projects
> The automotive market seems to have got mixed in there also!
> The main thrust dual ARM based and RISC-V
> Also I like the plexiglass air shroud pictured at Barcelona. I saw
> something similar at the HPE centre in Grenoble.
> Damn good idea.
> On 17 July 2018 at 13:07, Scott Atchley <e.scott.atchley at gmail.com> wrote:
>> Hi Chris,
>> They say that no announced silicon is vulnerable. Your link makes it
>> clear that no ISA is immune if the implementation performs speculative
>> execution. I think your point about two lines of production may make sense.
>> Vendors will have to assess vulnerabilities and the performance trade-off.
>> Personally, I do not see a large HPC system being built out of
>> non-speculative hardware. You would need much more hardware to reach a
>> level of performance and the additional power could lead to a lower
>> performance per Watt (i.e., exceed the facility's power budget).
>> On Tue, Jul 17, 2018 at 2:33 AM, Chris Samuel <chris at csamuel.org> wrote:
>>> On Tuesday, 17 July 2018 11:08:42 AM AEST Chris Samuel wrote:
>>> > Currently these new vulnerabilities are demonstrated on Intel & ARM,
>>> it will
>>> > be interesting to see if AMD is also vulnerable (I would guess so).
>>> Interestingly RISC-V claims immunity, and that looks like it'll be one
>>> of the
>>> two CPU architectures blessed by the Europeans in their Exascale project
>>> (along with ARM).
>>> All the best,
>>> Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC
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