Re: OHSM benchmarking [Was Re: Copying Data Blocks]

2009-01-24 Thread Martin Møller Skarbiniks Pedersen
2009/1/25 Greg Freemyer : > Then first do a dd test to see how fast it works from pure userspace. ie. > > dd if=/dev/zero of= bs=1m count=2000// build a 2 GB test file > > time (dd if= of= bs=1m; sync) > > repeat at least a couple times to verify the times. > Remember to run echo 3 > /proc/s

Re: OHSM benchmarking [Was Re: Copying Data Blocks]

2009-01-24 Thread Greg Freemyer
On Thu, Jan 22, 2009 at 11:18 PM, Sandeep K Sinha wrote: > On Thu, Jan 22, 2009 at 8:50 PM, Greg Freemyer > wrote: >> On Thu, Jan 22, 2009 at 3:49 AM, Sandeep K Sinha >> wrote: >> >>> >>> Help us with the benchmarking ? >> >> My first question would be: Why are you benchmarking at all? >> > > A

Re: OHSM benchmarking [Was Re: Copying Data Blocks]

2009-01-22 Thread Sandeep K Sinha
On Thu, Jan 22, 2009 at 8:50 PM, Greg Freemyer wrote: > On Thu, Jan 22, 2009 at 3:49 AM, Sandeep K Sinha > wrote: > >> >> Help us with the benchmarking ? > > My first question would be: Why are you benchmarking at all? > A few lines from one of previous mails. "Suspiciously fast. At first glan

OHSM benchmarking [Was Re: Copying Data Blocks]

2009-01-22 Thread Greg Freemyer
On Thu, Jan 22, 2009 at 3:49 AM, Sandeep K Sinha wrote: > > Help us with the benchmarking ? My first question would be: Why are you benchmarking at all? I can see a basic benchmark just to prove you are actually moving data in a reasonably efficient way. Disk drives are notoriously slow, so on