On Dec 18, 2007, at 3:32 AM, Gregory Stark wrote:
>> Also, has anyone looked into adding a class of system calls that
>> would
>> actually tell us if the kernel issued physical IO? I find it hard
>> to believe
>> that other RDBMSes wouldn't like to have that info...
>
> Yeah, I think that's called "DTrace"
That seems like way overkill...
When a read() call returns, surely the kernel knows whether it
actually issued a physical read request to satisfy that. I don't see
any reason why you couldn't have a version of read() that returns
that information. I also rather doubt that we're the only userland
software that would make use of that.
--
Decibel!, aka Jim C. Nasby, Database Architect decibel@decibel.org
Give your computer some brain candy! www.distributed.net Team #1828