On 2010-07-14 18:21, Jonas Maebe wrote:
Apart from specific scenarios, memory mapping can easily be slower
than direct reads. The main reason is that you get round trips to the
OS via hardware interrupts whenever you trigger a page fault, instead
of doing one or more (relatively cheap compared to interrupts) system
calls. The potential savings of a few memory copies, especially for
files in the range of 2-500kb, is very unlikely to compensate for this.
Now that SSDs (which are near enough to random access memory) are
getting to be cheap enough to be affordable for mainstream use (plus the
much higher bandwidths of SATA3, USB3) is it feasible to further
optimize IO speeds for the compiler at this stage?
Cheers,
Adem
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