Hi list, is it normal, that a 'dd' or an 'IOR' pushing 10MB blocks to a lustre file system shows up with a 100% CPU load within 'top'? The reason why I am asking this is that I can write from one client to one OST with 500 MB/s. The CPU load will be at 100% in this case. If I stripe over two OSTs (which use different OSS servers and different RAID controllers) I will get 500 as well (seeing 2x250 MB/s on the OSTs). The CPU load will be at 100% again.
A 'dd' on my desktop pushing 10M blocks to the local disk shows 7-10% CPU load. Are there ways to tune this behavior? Changing max_rpcs_in_flight and max_dirty_mb did not help. Regards, Michael -- Michael Kluge, M.Sc. Technische Universität Dresden Center for Information Services and High Performance Computing (ZIH) D-01062 Dresden Germany Contact: Willersbau, Room A 208 Phone: (+49) 351 463-34217 Fax: (+49) 351 463-37773 e-mail: [email protected] WWW: http://www.tu-dresden.de/zih
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