Ah, I read your email wrong. Hmm...so writes really tank. Are you
using the storage nodes as servers, or other compute nodes?
-sam
On Jul 17, 2007, at 11:15 AM, Sam Lang wrote:
Hi Florin,
Just one clarification question...are those are bandwidth numbers
not seconds as the plot label suggests?
-sam
On Jul 17, 2007, at 11:03 AM, Florin Isaila wrote:
Hi everybody,
I have a question about the PVFS2 write performance.
We did some measurements with BTIO over PVFS2 on lonestar at TACC
(http://www.tacc.utexas.edu/services/userguides/lonestar/)
and we get pretty bad write results with classes B and C:
http://www.arcos.inf.uc3m.es/~florin/btio.htm
We used 16 I/O servers, the default configuration parameters and upto
100 processes. We realized that all I/O servers were used also as
metadata servers, but BTIO uses just one file.
The times are in seconds, contain only I/O time (no compute time) and
are aggregated per each BTIO run (BTIO performs several writes).
TroveSyncMeta was set to yes (by default). Could this cause the I/
O to
be serialized? It looks as if there were a serialization.
Or could the fact that all nodes were also launched as metadata
managers affect the performance?
Any clue why this happens?
Many thanks
Florin
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