On Tue, Jun 15, 2010 at 10:14 PM, Gorka Guardiola <[email protected]> wrote: > On Wed, Jun 16, 2010 at 12:07 AM, erik quanstrom <[email protected]> > wrote: >>> Last time I needed something similar, I just run a modified iostats. >> >> how does iostats add latency? >> > > hence the modified. >
Hi Gorka Do you still have your modified iostats around? I'm really not sure about the results I get from adding sleeps in the ip code--it takes over twice as long to copy a 10M file between my two test machines (supposed to have 14ms RTT latency added, ping seems to indicate this) than it does to copy from a system running a non-modified kernel to go.cs.bell-labs.com (14ms RTT). I'd like to try running the tests with a different latency method. Thanks John -- "With MPI, familiarity breeds contempt. Contempt and nausea. Contempt, nausea, and fear. Contempt, nausea, fear, and .." -- Ron Minnich
