Am 15.11.2012 16:14, schrieb Sage Weil:
On Thu, 15 Nov 2012, Stefan Priebe - Profihost AG wrote: Hmm, most significant time seems to be in the allocator and doing fsetxattr(2) (10%!). Also some path traversal stuff.
Yes fsetxattr seems to be CPU hungry.
Can you try the wip-fd-simple-cache branch, which tries to spend less time closing and reopening files? I'm curious how much of a different it will make for you for both IOPS and CPU utilization.
It seems to give me around 1000 iops across 3 VMs.
It is also possible to use leveldb for most attrs. If you set 'filestore xattr use omap = true' it should put most attrs in leveldb.
Tried this but this raises CPU by 20%. Any other ideas how to reduce ceph-osd while doing randwrite? Randread gives me with 3 VMs: 60.000 iops Randwrite gives me with 3 VMs: 25.000 iops Stefan -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
