Re: jit test failure octave 3.8 on windows

[Philip Nienhuis]

tmacchant wrote
> Hello
> 
> On the thread concerning GNU Octave in Japan, there was a report for jit
> feature of octave-3.8.0 downloaded from http://mxeoctave.osuv.de/ 
> 
> octave-3.8.0-5, octave-3.8.1-rc3
> Test
> 
>> a = 1; b = 1; tic; for i=1:1000; for j=1:1000; a = a + b; end; end; toc 
> Elapsed time is 1.5 seconds. 
>> jit_enable(1) 
>> a = 1; b = 1; tic; for i=1:1000; for j=1:1000; a = a + b; end; end; toc
> (No response)
> 
> I have tested the same test on Ubuntu 12.04 LTS (32bit) on octave-3.8.0
> built by myself on my old notebook .
> 
> octave:1> a = 1; b = 1; tic; for i=1:1000; for j=1:1000; a = a + b; end;
> end; toc 
> Elapsed time is 4.21553 seconds. 
> octave:2> jit_enable(1) 
> octave:3> a = 1; b = 1; tic; for i=1:1000; for j=1:1000; a = a + b; end;
> end; toc 
> Elapsed time is 0.891052 seconds. 
> 
> In this case jit feature worked correctly.
> 
> Have anyone met the same phenomena on mxe-build mingw octave ?

Hi Tatsuro,

Yes I think I've reported a similar issue already (IIRC) some months ago for
the 3.7.7+ series, see here:
https://mailman.cae.wisc.edu/pipermail/octave-maintainers/2013-November/037260.html

I hit it when running __run_test_suite__.m. 
Symptoms:
- it seems that jit.tst hangs, but:
- is doesn't, after 20 minutes or so it segfaults.
IIRC it happened already at the 3rd (still very simple) test in jit.tst.
More details in bug #40608

Moving jit.tst out of the way (from share/octave/3.8.0/etc/tests/fixed to
e.g., share/octave/3.8.0) makes __run_test_suite__.m finish.

At the time one of the replies mentioned that JIT still has many problems,
at least on Windows. The advice was to ignore it for the time being (see
here:
http://lists.gnu.org/archive/html/octave-bug-tracker/2013-11/msg00519.html)

On the patch tracker there are improvements for llvm/JIT, made in the course
of GSoC last year, that haven't been merged yet. Perhaps these patches
contain fixes that make llvm work better on Windows, who knows.

Philip




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