2 Jul
2008
2 Jul
'08
11:53 a.m.
Arnold Krille:
As the transfer from memory to hd is _the_ slow point
of the setup,
cache-misses or hits don't influence that at all. And when you are not
calculating anything (apart from 64bit to 32bit double-to-float), you don't
access the cache. DMA is the keyword. Still it doesn't make saving to disk
faster than your disks and controllers speed. And I am pretty sure that there
is _no_ compression involved in that part, otherwise this would seriously
affect data-integrity if the controller did an unwanted compression.
Okay, but I'm also thinking about the HD cache and the cache between
the OS and the disk. I don't know how it works
exactly though, but I thought that maybe it didn't write to disk as
often if the cache is constantly filled with zeros.
Is that enough back-up for my "bombastically
spilled out" argumentation?
Sure, much better argumentation.
A double (or float) to transfer to disk is still a
double (float) to transfer
to disk regardless wether the value is 0, close to zero or something close to
INFINITY...
Yes, but no doubles or 64 bits are involved in this process, only
32 bit floats.