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Subject:	Seaborg debugging problems
Author:	David Turner <dpturner_at_lbl.gov>
Date:	2006-03-22 16:33:27
Greetings NERSC User, Several NERSC users have recently encountered problems debugging 64-bit MPI applications on Seaborg. Their interactive debugging sessions hang, and eventually one of the nodes crashes. This node must then be rebooted by NERSC staff. This failure can occur with any parallel debugger (totalview, pdbx). We have no evidence that the problem affects debugging of serial codes, or of any 32-bit codes. IBM has identified the source of the failure, and we expect a fix to be available in early May. Until then, we would like to ask users to refrain from using totalview or pdbx for 64-bit MPI codes on Seaborg. Bassi is not affected, and so should be used for this type of debugging. Please note that this condition is unrelated to today's switch problems on Seaborg. We apologize for any inconvenience this situation causes. -- Best regards, David Turner User Services Group email: dpturner@lbl.gov NERSC Division phone: (510) 486-4027 Lawrence Berkeley Lab fax: (510) 486-4316

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