Theo Lynn

Theo Lynn

Theo Lynn is Professor of Digital Business at DCU Business School and PI of the Irish Centre for Cloud Computing and Commerce. He is also a PI on the EU Horizon 2020 RECAP and CloudLightning projects.

Location Ireland


  • Bingo!

  • I am not so sure they will be replaced but the cloud will take over some workloads

  • CloudLightning ; )

  • As above, do you not think that the cloud is useful for certain types of HPC workloads? - loosely coupled or pleasingly parallelisable ones but for the "true HPC" workloads it probably doesn't work that well.

  • True. However some communications technologies are promising and may achieve step changes in data transfer which may make "true hpc" in the cloud more feasible in the medium term....however the definition of high performance is a movable feast so customer expectations will also be higher by then.

  • It is easy to fall in to that trap. Many large scale HPC workloads simply don't work in the cloud./

  • Yes, a hybrid solution is a possibility. But also as telecommunications technology improve, it is possible we could see HPC in the Cloud for larger workloads a reality.

    I think the reality is that the cloud is useful for certain types of HPC workloads - loosely coupled or pleasingly parallelisable ones but for the "true HPC" workloads it probably doesn't...

  • But this course argues that you can democratise HPC and allow smaller organisations rent specialised infrastructure without the CAPEX of traditional HPC? Do you not see the potentialities there for HPC in the cloud?

  • I think the issue will be whether cloud will replace HPC?

    Governments are more likely to use hybrid solutions. No?

  • @SAMUELOLAGOKE some of these issues exist independent of the cloud though? Maintaining and upgrading is easier in the cloud.

  • Hi Christine. It depends at what level you are using the cloud. For example, IBM provide bare metal as a service

  • @Dell'OsteVincenzo @BillLaing Security is a contentious issue - some say the cloud is safer, some say it is inherently not as safe as on-premise. To some extent it comes down to trust and control. I tend to believe that major hyperscale cloud service providers are much better positioned than the overwhelming majority of enterprises at security. However,...

  • It can be but remember at a macro-level, all these data centres consume a lot of electricity which is also bad for the environment!

  • Hi Daniel. There are readings at each chapter and we will be emailing everyone to give you access to an open access book that complements the course. If you want to get ahead - you can download at

  • Great. Dell EMC is forging ahead in this area -


  • Great. We will be focussing more on HPC in the Cloud, which is quite niche, but welcome!

  • I definitely think things have improved. This course doesn't particularly look at security but security is a major factor in cloud adoption and reticence.

  • Well I'm glad you are doing the course then. As Francis Bacon says:

    "There is nothing makes a man suspect much, more than to know little, and therefore men should remedy suspicion by procuring to know more, and not keep their suspicions in smother."

  • Hi Joseph. This may be a bit advanced but welcome!

  • Hi Suwash. Wow, interesting field. Hopefully there will be some things you can apply from this course in your research.

  • Hi John. Welcome. One of the use cases we will look at briefly and use as a reference point is OPM - and the Upscaling module specifically.

  • Hi Saida. Interesting. While this course doesn't really deal with that topic. We are looking to apply the CloudLightning Simulator to telecommunications use cases in the Horizon 2020 RECAP project. More info at

  • Some of the contributors in this course are from CERTH in Thessaloniki and DUTH. Weclome!

  • @WalidShaari I think this largely depends on the workload and configuration of the HPC cluster in the cloud

  • Is this a function of how much you are willing to pay for the QoS you need?

  • What if its a private cloud? Is security still an issue?

  • I like how you are are categorising here. The question is what does HHPC and LHPC mean? Is it loosely coupled vs tightly coupled? Its a movable feast of course.

  • We have that today. Rendering is the low hanging fruit....what about the truly high performance computing workloads...high performance is a moving target? Even in rendering as we develop devices for displaying higher resolution 3 dimensional imaging, we need higher powered processor units etc...

  • Of course, they are hard to answer - they are designed to make you think! I like your answer though - balanced and pragmatic. I think the security issue can be a huge distractor - in some cases, yes security is an issue e.g. big other cases maybe not so much.

  • Hi Robin. I agree. The ability to scale up and down (ideally automatically/autonomically) is a key advantage particularly for SMEs.

  • Hi Katherine. The democratisation of enterprise computing and in this case high performance computing which may have been costly, inconvenient to access, or difficult to use without specialist training is a key advantage of cloud computing. I truly believe HPC in the Cloud, in particular, can play a huge role in accelerating innovation by unleashing computer...

  • I agree, Patrick. Speed to market and speed of deployment is incredibly important and can be a significant source of competitive advantage.

  • Hi Katherine. DFEs in particular may be interesting for you - they are widely used in financial services and in this course, we look at their use for genomics. These are typical high performance data analytics use cases. Welcome.

  • Welcome Kat. This course is very HPC in the cloud may not hit all your requirements but welcome!

  • Hi Magnus. It is great that you have some experience with AWS - they are pushing the boundaries in cloud and HPC through what they term "high throughput computing" and indeed are offering CPUs, GPUs and FPGAs in the cloud so this course should provide some interesting insights for you. Welcome.

  • Hi Sandeep. You seem to have nearly an ideal background for this course. We'll be touching all those topics - HPC, cloud, containerisation etc throughout the course. Stick with it!

  • Green computing is (can be) something different than the cloud. Indeed we will discuss some debates about how green cloud data centers really are. In Week 1, we should deal with some of these issues. Welcome, Ssemujju!

  • Hi Mark. Welcome - hopefully we'll meet your research and educational requirements!

  • Hi Ananth - we'll be talking about HPC a lot - most in the cloud but it should give you a lot of insights about HPC.

  • Welcome Pete. We'll deal with the cloud straight away in Week 1!

  • Hi Valerie. Hopefully you'll learn some interesting things about the cloud in Week 1. Week 2 onwards gets a bit technical but hopefully you'll get something from the course. Welcome!

  • Hi Srinivas. I think we'll answer some of your questions in Week 1. Welcome.

  • Hi Simon. It sounds like you are at the coalface already. Hopefully, you will find some insights in this course