Re: [Bug-apl] r819 has severe performance issue

[David Lamkins]

Seems fine, here. Thank you.

On Dec 13, 2016 10:44 AM, "Juergen Sauermann" <address@hidden> wrote:

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.