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--- huibintemaspamfaq [2019/06/18 04:45] – [Problems running SPAM on new Intel CPUs, possibly after Linux update] huibintema
+++ huibintemaspamfaq [2019/06/18 05:24] – huibintema
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 ==== 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 This is likely caused by an outdated Intel compiler used to build the AIPS binary install.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 [[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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 (Kindly suggested by Chris Riseley)
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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 This is likely caused by an outdated Intel compiler used to build the AIPS binary install.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.
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