huibintema:spam:faq
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huibintema:spam:faq [2021/02/03 14:30] huibintema |
huibintema:spam:faq [2021/03/15 12:52] (current) huibintema [Problems running SPAM on new Intel CPUs, possibly after Linux update] |
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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 This is likely caused by an outdated Intel compiler used to build the AIPS binary install.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 This is likely caused by an outdated Intel compiler used to build the AIPS binary install.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. | ||
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| + | ----- | ||
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| + | ==== 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 ยท Last modified: 2021/03/15 12:52 by huibintema
