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huibintema:spam:faq [2021/02/03 14:30] huibintemahuibintema:spam:faq [2021/03/15 12:52] (current) – [Problems running SPAM on new Intel CPUs, possibly after Linux update] huibintema
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 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 This is likely caused by an outdated Intel compiler used to build the AIPS binary install.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 [[https://ftp.strw.leidenuniv.nl/intema/spam/AIPS_31DEC13_Gnu.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 This is likely caused by an outdated Intel compiler used to build the AIPS binary install.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 [[https://ftp.strw.leidenuniv.nl/intema/spam/AIPS_31DEC13_Gnu.tgz|here]]. It may run a bit slower than the Intel compiled version.
 +
 +-----
 +
 +==== SPAM fails in running any AIPS tasks ====
 +
 +Q: Why do all AIPS task calls from SPAM fail without generating any AIPS text output?
 +
 +A: Your output may look something like this:
 +<code python>
 +*** calling AIPSTask FITLD
 +*** calling AIPSTask FITLD (RETRY 1)
 +*** calling AIPSTask FITLD (RETRY 2)
 +*** calling AIPSTask FITLD (RETRY 3, FINAL)
 +Traceback (most recent call last):
 +...
 +    raise RuntimeError, msg
 +RuntimeError: Task 'FITLD' returns '-999'
 +...
 +</code>
 +
 +This is likely because the path to the AIPS binary tasks is not set properly within SPAM. When you type the following in SPAM:
 +<code python>
 +os.getenv( 'PATH' )
 +</code>
 +the second entry in the PATH (between colons ':') should read something like
 +''<path_to_spam>/AIPS/31DEC13/LNX64/SYSTEM/<site_name>''.
 +If it reads 
 +''<path_to_spam>/AIPS/31DEC13/UNKNOWN/SYSTEM''
 +then it probably means that your computername is not listed in the HOSTS.LIST in <path_to_spam>/AIPS/. This can be tested by running ''start_aips.sh . 0'' instead of ''start_parseltongue.sh . <aips_userid>''. If so, add a line to the HOSTS.LIST file with your computername (in all CAPS), similar to the other lines in the file.
  
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huibintema/spam/faq.txt · Last modified: 2021/03/15 12:52 by huibintema

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