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huibintemaspamfaq [2018/12/08 00:35]
huibintema
huibintemaspamfaq [2019/06/18 06:23]
huibintema
Line 2: Line 2:
 ===== 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]].
  
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 </​code>​ </​code>​
 This will report all libraries that are needed by Obit. If one is missing, the line will contain the text "=> not found"​. This will report all libraries that are needed by Obit. If one is missing, the line will contain the text "=> not found"​.
 +
 +-----
 +
 +==== libncurses.so.6 is missing ====
 +
 +Q: Why is libncurses.so.6 reported to be missing during the AIPS install?
 +
 +A: The AIPS install may fail because the libncurses.so.6 library cannot be found. This library is available in the lib subdirectory of the spam install directory. The library can be copied to one of the standard locations (e.g., /usr/lib), or the LD_LIBRARY_PATH can be modified to include the spam/lib directory before running AIPS install again. The latter can be done in bash:
 +<code bash>
 +export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:​${SPAM_PATH}/​lib
 +</​code>​
 +Or in (t)csh:
 +<code bash>
 +setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:​${SPAM_PATH}/​lib
 +</​code>​
  
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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 This is likely caused by an outdated Intel compiler used to build the AIPS binary install.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: 2020/10/05 17:48 by huibintema