On Mon, 3 Aug 2015 12:06:27 PM Mikhail Kuzminsky wrote: > Current Intel Haswell E5 v3 may also have 18 = 2**4 +2 cores. Is > there some sense to try POWER BQC or SPARC64 XIfx ideas (not exactly), > and use only 16 Haswell cores for parallel computations ? If the > answer is "yes", then how to use this way under Linux ?
Doing this with Linux predates BGQ for instance - the whole cpuset idea came from SGI and was used on their Itanic Altix systems to provide a boot CPU set that would have all system processes confined into and then the rest of the cores were available for jobs. When we used to use Torque I agitated for cpuset support, and for it to be done in a way that would allow this. We use Slurm now, but I've never looked at how easy to make it work in the boot cpuset type mode - it's probably just a matter of telling it there are N-1 cores per node and ensuring that it doesn't try and claim the same core you're using as the boot cpuset. :-) Plus one to Chris with cpusets. Cpusets not only on Itanium - I used them on a large memory UV system. I Can see more and more people speccing high memory x86 systems these days, and they certainly should be looking at using cpusets. I have often though we should have 'donkey engine' CPUs for HPC. I thought these were the small enginers which powered up very large shipboard engines. I may have that wrong! https://en.wikipedia.org/wiki/Steam_donkey As Mikhail says, you run the OS and the batch system daemons on there, leaving the rest of the CPUs for 100% flat out HPC work. ##################################################################################### Scanned by MailMarshal - M86 Security's comprehensive email content security solution. ##################################################################################### Any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the company. Employees of XMA Ltd are expressly required not to make defamatory statements and not to infringe or authorise any infringement of copyright or any other legal right by email communications. Any such communication is contrary to company policy and outside the scope of the employment of the individual concerned. The company will not accept any liability in respect of such communication, and the employee responsible will be personally liable for any damages or other liability arising. XMA Limited is registered in England and Wales (registered no. 2051703). Registered Office: Wilford Industrial Estate, Ruddington Lane, Wilford, Nottingham, NG11 7EP _______________________________________________ Beowulf mailing list, [email protected] sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
