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From: Arthur N. <ac...@ca...> - 2016-04-27 10:14:04
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I just found enough of a 64-bit Fedora image to try my Raspberry Pi 3 in
64-bit mode. AT present I do not have a native desktop, but I can use ssh
and X-forwarding and run the CSL version of Reduce on it. I had a small
trouble in that at least as of today subversion crashes when I try to use
it to fetch Reduce - so I copied the files across from another machine.
For comparison I also built on a Raspberry Pi 3 using the 32-bit raspbian.
First sizes. compiled in 32-bit mode I have the reduce executable and
image files with sizes 4755K and 5288K. On the 64-bit system reduce is
5519K and 5416K
I note that during the build on the 64-bit system gnome-system-monitor
showed that memory use was always under 40%, so neurosis about the 64-bit
version being more bulky and that being a worry on a 1Gbyte system should
not be a sharp concern.
Running scripts/testall.sh --csl on the 32-bit raspbian reports:
CSL total = 692.88 (seconds)
while the test run had a total elapsed time of 18 minutes with all the
shall scripting overheads etc etc. On the 64-bit system I see
CSL total = 1161.74 (seconds)
and the total elapsed time was 28 mins.
Both versions led to valid sets of logs, so apart from the speed
difference both seem to behave.
All the numbers and comparisons can change as the 64-bit ARM world for
Raspberry Pi stabilises. Also these tests were run on two separate
Raspberry Pi 3 machines with different SD cards so the speed of the SD
cards may have had some impact. AT present I do not know how to run 32-bit
binaries on the 64-bit platform (or indeed if that is supported yet) but
when I can I will try an even more direct comparison.
Arthur
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