On Dec 18, 2007, at 3:32 AM, Gregory Stark wrote:
>> Also, has anyone looked into adding a class of system calls that
>> 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(at)decibel(dot)org
Give your computer some brain candy! www.distributed.net Team #1828
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