8 ms·
At a guess, a single thread which benefits from as much cache as it can get.
by _a_a_a_ 2y ago
At a guess, a single thread which benefits from as much cache as it can get.
- tedunangst 2y agoSure, but having to buy entire CPUs filled with idle cores to scale up cache seems very expensive.
- _a_a_a_ 2y agoI said this is where it would help (AFAICS), not that it was the best solution.
- kev009 2y agoThese cores are typically licensed with class/restrictions so in absolute terms yes but in the financial engineering of how the system is delivered with excess and restricted hardware no (see core types on the prior/shipping generation here https://www.ibm.com/downloads/cas/6NW3RPQV https://www.ibm.com/downloads/cas/6NW3RPQV) There are probably design reuse and RAS considerations that make it not currently worthwhile to i.e. have a distinct physical design for SAP or whatever cores.
- sillywalk 2y agoI don't know if it's still the case, but in terms of RAS, the Z/Series CPUs from ~2004 had duplicated/compared instruction-fetch/decode and execution units. https://pages.cs.wisc.edu/~remzi/Classes/838/Fall2001/Papers/tale-of-two.pdf https://pages.cs.wisc.edu/~remzi/Classes/838/Fall2001/Papers...
- nxobject 2y agoI wouldn't be surprised as well if there was some binning that occurred – the dies are huge, so why not overprovision in the design? (Although erring on the side of slighlty more surprise in the case of some binning, since IBM mainframes seem to exist beyond the laws of commodity economics, and it looks like they're using a 5nm node.)
- nullc 2y agothe CPU's only appear to use about 1/3rd of the die area. Most of the space is cache.
- twic 2y agoPeople buy whole machines to run memcached!