[Pkg-gmagick-im-team] Bug#770009: convert(1) very slow on mips with no FPU

[roucaries bastien]

On Sat, Aug 15, 2015 at 10:16 PM, roucaries bastien
<roucaries.bastien+debian at gmail.com> wrote:
> On Sat, Aug 15, 2015 at 9:43 PM, James Cowgill <james410 at cowgill.org.uk> wrote:
>> Hi,
>>
>> On Sat, 2015-08-15 at 14:08 +0100, Simon McVittie wrote:
>>> (debian-mips: please keep me and the bug in Cc if replying.)
>>>
>>> On Wed, 28 Jan 2015 at 08:00:53 +0100, roucaries bastien wrote:
>>> > Smell like an openmp bug.... ny memory they are a enviroment variable to
>>> > disable openmp.
>>>
>>> I tried building with --disable-openmp on a mips porterbox
>>> (minkus.debian.org, which I believe is a dual Cavium Octeon II with no FPU,
>>> the same as the buildds where imagemagick has been failing).
>>
>> Yes, minkus and mips-aql-* all run identical hardware and do not have
>> FPUs (unfortunately).
>>
>>> Unfortunately building with --disable-openmp doesn't seem to help.
>>>
>>> On Thu, 29 Jan 2015 at 19:59:45 +0100, Bastien ROUCARIES wrote:
>>> > try to add to convert command line "-limit thread 1"
>>>
>>> Sadly that doesn't seem to help either.
>>>
>>> > On Fri, Jan 30, 2015 at 2:37 PM, Dejan Latinovic
>>> > <Dejan.Latinovic at imgtec.com> wrote:
>>> > > did anyone tried to wait some longer time to see if command will execute?
>>> >
>>> >   No, but the build machines wait for a pretty long time before
>>> > killing (5 hours), and I've checked that it uses the proc at 200%. We
>>> > can't burden the build machines like that...
>>>
>>> The latest experimental build (which adds some "echo", to stop sbuild
>>> killing the build process after 5 hours of apparent inactivity) took
>>> 19 hours. That's longer than gcc-5 took on the same hardware.
>>>
>>> While doing test builds yesterday evening, I was able to compile
>>> imagemagick more than once, so it can't have taken longer than 2 or 3 hours;
>>> assuming the porterbox and the buildd have a similar spec, that means
>>> converting a SVG to a PNG 14 times is taking at least 16 hours.
>>> That seems unusably slow to me. It's entirely possible that imagemagick
>>> built for mips is currently only really useful on mips hardware that has
>>> a FPU. Unfortunately, the mips buildds don't seem to have FPUs.
>>>
>>> mips porters: how common are FPUs expected to be among mips machines
>>> where Debian will run?
>>
>> I have no numbers but I would guess that most of the machines that run
>> the big endian port are network hardware which don't have FPUs.
>>
>>> Also, is it an ABI break for a mips library to be built with -msoft-float?
>>
>> Yes the ABI is different - you need a recompiled glibc (at least) to
>> use -msoft-float.
>
> Could this handled like libc-i686 ? It will be really helpful to have
> a soft-float version and use ld.so to switch between.

They are a thread here about multilib
https://lists.linaro.org/pipermail/cross-distro/2012-April/000167.html

Bastien
> Bastien
>
>> Thanks,
>> James