[Mulgara-general] Performance of the commit operation

[Schenk, Andre]

Hi Paul,
 
> By the way.... how much data have you written when you do the commit operation?

I wrote a simple test which consecutively inserts

"<http://www.domain.net/~jsmith/home.html" + serial + "> <dc:creator> 'John Smith' into <rmi://localhost/server1#model1>;"

10 times in a single transaction. "serial" is just an integer value. This takes about 100ms. But the following commit takes about 500ms. This seems to be a lot of time.

> Most disk write operations return very quickly, but if the power were removed, then after the computer rebooted the data would not be found anyway, 
> since it was only in RAM and waiting for the writeback.  This makes the program more responsive, but less reliable.

In the meantime I had the chance to repeat my tests with the underlying ReiserFS set to data=writeback. The performance gain was not more than 10%.

Best regards,

André


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