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huibintemaspamfaq [2018/10/31 00:45] huibintemahuibintemaspamfaq [2019/06/18 05:24] huibintema
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 ===== SPAM frequently asked questions ===== ===== SPAM frequently asked questions =====
  
-This ever-expanding section is based on user feedback. For questions on installing SPAM, see [[huibintemaspaminstall|this page]]. If you encounter a problem not listed below, please feel free to [[intema@strw.leidenuniv.nl|contact me]].+This ever-expanding section is based on user feedback. For questions on installing SPAM, see [[huibintemaspaminstall|this page]]. If you encounter a problem not listed below, please feel free to [[huib.intema@curtin.edu.au|contact me]]. 
 + 
 +----- 
 + 
 +==== Obit is missing ==== 
 + 
 +Q: Why is Obit reported to be missing during the ParselTongue install? 
 + 
 +A: The ParselTongue configuration command may give you the following error message: 
 +<code bash> 
 +checking for Obit... missing 
 +configure: error: Obit is not available 
 +</code> 
 +This is likely to be caused by a missing python package or system library, not because Obit is missing (the script looks for Obit.so in the ${SPAM_PATH}/Obit/python/ directory. To find what is causing the problem, please do the following: 
 +In bash: 
 +<code bash> 
 +. <spam_install_path>/setup.sh 
 +export PYTHONPATH=${SPAM_PATH}/Obit/python:${PYTHONPATH} 
 +export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${SPAM_PATH}/lib 
 +</code> 
 +Or in (t)csh: 
 +<code bash> 
 +source <spam_install_path>/setup.csh 
 +setenv PYTHONPATH ${SPAM_PATH}/Obit/python:${PYTHONPATH} 
 +setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:${SPAM_PATH}/lib 
 +</code> 
 +Then 
 +<code bash> 
 +${PYTHON} 
 +</code> 
 +And in python: 
 +<code python> 
 +import OSystem, OErr 
 +</code> 
 +Something will fail here, probably a missing python package or a missing library. Some of the missing libraries can be found [[ftp://ftp.strw.leidenuniv.nl/pub/intema/spam/lib/|here]]. Another possible command that may reveal missing libraries is through the following shell command: 
 +<code bash> 
 +ldd ${SPAM_PATH}/Obit/python/Obit.so 
 +</code> 
 +This will report all libraries that are needed by Obit. If one is missing, the line will contain the text "=> not found".
  
 ----- -----
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 ----- -----
- 
  
 ==== Problems running SPAM on new Intel CPUs, possibly after Linux update ==== ==== Problems running SPAM on new Intel CPUs, possibly after Linux update ====
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 Q: Why doesn't the SPAM pipeline work (anymore), with AIPS generating NaNs in certain tasks? Q: Why doesn't the SPAM pipeline work (anymore), with AIPS generating NaNs in certain tasks?
  
-A: Updates of the Linux operating system in 2017 has triggered floating point problems when running AIPS tasks on a new line of Intel Xeon E5-xxx CPUs. This is likely caused by an outdated Intel compiler used to build the AIPS binary install. A GNU compiled version of AIPS 31DEC13 fixes the problem and is available [[ftp://ftp.strw.leidenuniv.nl/pub/intema/spam/AIPS_31DEC13A.tgz|here]]. It may run a bit slower than the Intel compiled version.+A: Updates of the Linux operating system in 2017 has triggered floating point problems when running AIPS tasks on a new line of Intel Xeon E5-xxx CPUs. This is likely caused by an outdated Intel compiler used to build the AIPS binary install. A GNU compiled version of AIPS 31DEC13 fixes the problem and is available [[ftp://ftp.strw.leidenuniv.nl/pub/intema/spam/AIPS_31DEC13_Gnu.tgz|here]]. It may run a bit slower than the Intel compiled version. 
 + 
 +Q: Why does the SPAM pipeline generate signal 11 errors in certain AIPS tasks? 
 + 
 +A: What is causing this is not completely clear, but probably has to do with the newer Intel hardware and Linux installs. A work-around seems to be to use the GNU-compiled version of AIPS 31DEC13 available [[ftp://ftp.strw.leidenuniv.nl/pub/intema/spam/AIPS_31DEC13_Gnu.tgz|here]]. It may run a bit slower than the Intel compiled version. 
 + 
 +(Kindly tested by Gerrit Schellenberger and Arnab Chakraborty) 
  
 ----- -----
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 ----- -----
 +
 +==== Problems running SPAM on new Intel CPUs, possibly after Linux update ====
 +
 +Q: Why doesn't the SPAM pipeline work (anymore), with AIPS generating NaNs in certain tasks?
 +
 +A: Updates of the Linux operating system in 2017 has triggered floating point problems when running AIPS tasks on a new line of Intel Xeon E5-xxx CPUs. This is likely caused by an outdated Intel compiler used to build the AIPS binary install. A GNU compiled version of AIPS 31DEC13 fixes the problem and is available [[ftp://ftp.strw.leidenuniv.nl/pub/intema/spam/AIPS_31DEC13_Gnu.tgz|here]]. It may run a bit slower than the Intel compiled version.
 +
 +-----
 +
 +Feedback: [[huib.intema@curtin.edu.au|Click here]]
  
huibintemaspamfaq.txt · Last modified: 2021/02/03 14:26 by huibintema

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