hugin-devs team mailing list archive

[tmodes <679164@xxxxxxxxxxxxxxxxxx>]

I'm not sure if running several instances of nona or enblend parallel is a good idea. Both program can use several threads/core parallel. So running several instance of nona parallel can result in unwanted blocking behavior of the different threads. Also the programs needs often a lot of free memory. So when running several threads parallel this is amplified. This can be to relieved to some amount by restricting the number of threads in the preferences.
Some idea: Would it help to call make with the -j1 switch, also "make -f makefile -j1 info test all clean"? Or do you think, that's a wrong way?

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https://bugs.launchpad.net/bugs/679164

Title:
  hugin invokation of make failure on MAKEFLAGS=-j2

Status in Hugin - Panorama Tools GUI:
  Confirmed

Bug description:
  Hello,

  this has originally been reported by Helmut Grohne in <http://bugs.debian.org/525494>.
  ----------------------------------
  nona -z PACKBITS -r ldr -m TIFF_m -o blah -i 0 /tmp/huginpto_deFg2s
  nona -z PACKBITS -r ldr -m TIFF_m -o blah -i 1 /tmp/huginpto_deFg2s
  nona -z PACKBITS -r ldr -m TIFF_m -o blah -i 2 /tmp/huginpto_deFg2s
  rm blah0000.tif blah0001.tif blah0002.tif 
  enblend --compression LZW -m 1500 -f2277x4564 -o blah.tif blah0000.tif blah0001.tif blah0002.tif 

  enblend: error opening input file "blah0000.tif":

  Precondition violation!
  Unable to open file 'blah0000.tif'.

  make: *** [blah.tif] Fehler 1
  ----------------------------------

  Hugin stitiching breaks if MAKEFLAGS=-j2 is set. The reason is a rather simple one, during stitching hugin invokes "make all clean". With parallelisation clean is run before all is finished and this happens with three images and -j2 (xa and xb are run in parallel):
  1a nona for image 1
  1b nona for image 2
  ------
  2a nona for image 3
  2b rm temporary files, including the output the first nona invocations
  ------
  3a run enblend, which fails due to missing files.

  The correct fix is to only run clean after all has finished (make all && make clean). Removing MAKEFLAGS from the environment might not hurt but should be configurable.
  See also <https://sourceforge.net/tracker/?func=detail&aid=2781240&group_id=77506&atid=550441>.

  This is verified for 0.7.0, but afaict this should also apply to SVN
  HEAD (0.8.0 prerelease r3801), which invokes "make test all clean".

  thanks, cu andreas

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