The EOSC catalogue today lists 57 items in total. For computing services, only 9 items are listed on https://eosc-portal.eu/services-resources/compute . There is a lot of animation going on for each item when you load the page, but there still remain only 9 items. Six of these seem to by some kind of Cloud service, but only one mentions HPC in the catalogue list. The EGI High-Throughput Compute is the 7th item in the list. It has an understandable description: "Execute thousands of computational tasks to analyse large datasets". The other 3 items are by "PRACE" of which one mentions "HPC".
Yes, I know: 7 + 3 = 10. But https://marketplace.eosc-portal.eu/categories/compute says there are nine, although that lists different services than the one from the main page. I am sure there is a good explanation for that, but it is not an obvious one.
So, let us look at the one single "PRACE" entry that mentions HPC. This is the description: "Project Access is the access to PRACE Tier-0 world class high performance computing (HPC) resources for projects, which use codes that have been previously tested and have demonstrated high scalability and optimisation. Preparatory Access is strongly recommended to collect technical data to support the request of resources. Proposals for Project Access must be based on computer codes and data ready to run on the Tier-0 systems."
Just assume for one moment you are one of those millions of EOSC users that do not know PRACE. If you would know PRACE, you would not be looking at the EOSC catalogue for a PRACE service, would you? But if you do not know PRACE, you probably also do not know what a Tier-0 HPC resource is. And although you may have "codes that have been previously tested and have demonstrated high scalability and optimisation", you probably do not know if they are ready to run on a Tier-0 system - even if you have figured out what "Tier-0" system means.
So the PRACE catalogue information is not very informative for an HPC user looking in the EOSC catalogue.
But perhaps I do not need an HPC system, perhaps a Cloud will do?
Well have a look at the entry "CloudFerro Infrastructure". With the explanation:
"CREODIAS platform is a cloud infrastructure adapted to the processing of big amounts of EO data, including an EO Data storage cluster and a dedicated IaaS cloud infrastructure for the platform's Users".
I assume EO is Earth Observation? Not "Evangelische Omroep"? So again, a little more information would have been helpful.
A third example is the "CSC ePouta" computing service. Actually, CSC also has a service called "cPouta". The latter is about HPC in the Cloud, ePouta is about providing a secure Cloud. So perhaps ePouta should not be classified as "Compute" in the EOSC catalogue.
Looking through HPC glasses, the EOSC catalogue, although it looks flashy, does not contain useful information.