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From: | David Lamkins |
Subject: | Re: [Bug-apl] r819 has severe performance issue |
Date: | Tue, 13 Dec 2016 12:42:06 -0800 |
Hi,
I have reverted the change between SVN 818 and 819 and I hope everything is back
to normal in SVN 820.
/// Jürgen
On 12/13/2016 10:10 AM, Juergen Sauermann wrote:
Hi,
I see. This was supposed to fix some other problem, but apparently didn't work.
I will look into this; in the meantime please fall back to r818 (*svn up -r818*).
/// Jürgen
On 12/13/2016 06:14 AM, David B. Lamkins wrote:
Revision 819 causes *severe* performance issues for my APL Packager.
https://github.com/TieDyedDevil/apl-pkg
(Use the `percy` branch.)
$ git clone https://github.com/TieDyedDevil/apl-pkg
# cd apl-pkg
$ git branch percy
$ ./install.sh
$ awe
Normally the system comes up in a second or so; under r819 it takes tens of minutes to complete, during which one CPU core is pegged. (It's slow enough that I first thought that some altered edge condition must've caused an infinite loop.)
Memory usage is stable.
FWIW, this happens in the packager's boot loader, so there's not a lot of APL code involved.
https://github.com/TieDyedDevil/apl-pkg/blob/ percy/boot/gnu-apl-linux.apl
Once past the boot loader (which took about 90 minutes on my Haswell i7 notebook), virtually every packager operation is noticeably slow. If I had to guess, I'd suspect that either branching or APL function calls are eating a lot of cycles unnecessarily; my code uses lots of both.
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