John Elrick wrote:
John Stanton wrote:
The real time with the pragma off is 1.78 seconds. The real time on
the "faster" machine is 8.4 seconds. When I set the synchronous
pragma to off on the "faster" machine, the time drops to 1.64.
John
Do your various machines use the same hard disk controller and similar
technology disks?
No. Some of the machines are actually in the hands of other team
members and the client. My local machines range from my son's EMachines
desktop to a brand new HP laptop running Vista.
So we have eight machines with widely varying hardware configurations,
yet five of them are within a second or so of being 10 times slower than
the average of other three for this particular operation.
John
I would look at the disk controller/disk drive hardware and the software
driver to see if they are reporting correctly to the OS. Some of your
numbers are too fast for regular disk technology and suggest that there
are either hardware defects or intentional shortcuts to always perform
some form of lazy write.
Even the fastest 15,000 RPM disks will take a minimum of 8 millisecs for
a secure disk write, and it is that disk latency which is the limiting
factor in secure buffer flushing.
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