Clayton wrote:
Your missing my point... downloading several files in
parallel off of the same server IS SLOWER because you
introduce a TREMENDOUS overhead of bouncing the read/write
head all over the place.
Hmm.
It seems like experience of someone running OS from the swap.
Buying more RAM, can reduce hard disk activity.
Doesn't Smart download in parallel (both when updating the
repositories and when downloading RPMs)? It sure seems like it does
on my computer... and I certainly do not have any problems with a read
write head bouncing all over the place. I download multiple files at
the same time with BitTorrent... no problems. I download multiple
Bit torrent seeks out NUMEROUS servers grab parts of each
file (in no particular order even). Bit Torrent is the
complete OPPOSITE of downloading multiple files from a
SINGLE server's hard drive (or striped RAID)
files at the same time via my web browser... no problems. I thought
the whole point of a multitasking OS was to do things in parallel...
not serially.... including downloads.
Yes, there IS that point...but it ONLY WORKS when the
resources are in parallel ***OR*** the non-duplicated
resources have less than a 50% duty-cycle in single
tasking. During downloads of files residing on the
same filesystem from a single server, NEITHER
condition is met, and so in that instance, attempts
at parallelization actually hinder performance.
Remember, all computers are physical devices. If
you fail to do an analysis of what is happening at
the physical level, then your analysis is likely
to be the complete opposite of reality. This is
especially true concerning any operation involving
disk drives.
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