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en:services:application_services:high_performance_computing:faq [2021/06/24 16:20] – mboden | en:services:application_services:high_performance_computing:faq [2022/07/22 08:51] (current) – [I'm running out of space. How can I increase my quota?] vend | ||
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+ | ====== Frequently Asked Questions ====== | ||
+ | |||
+ | ===== How can I acknowledge the GWDG HPC system in my paper? ===== | ||
+ | Please add this to your acknowledgements in your paper: | ||
+ | > This work used the Scientific Compute Cluster at GWDG, the joint data center of Max Planck Society for the Advancement of Science (MPG) and University of Göttingen. | ||
+ | Additionally, | ||
+ | |||
+ | ===== Job Killed with oom-kill events or out-of-memory handler ===== | ||
+ | Problem: Your job is killed with a message like this: | ||
+ | < | ||
+ | cgroup. Some of your processes may have been killed by the cgroup | ||
+ | out-of-memory handler.</ | ||
+ | Solution: Your job ran out of memory, ie. your program used more memory/RAM than you requested. Please request [[en: | ||
+ | |||
+ | ===== MPI Program crashes with " | ||
+ | The MPI program crashes with '' | ||
+ | < | ||
+ | [1623330291.429578] [dmp029: | ||
+ | [dmp029: | ||
+ | ==== backtrace (tid: 32332) ==== | ||
+ | 0 0x0000000000051ffe ucs_debug_print_backtrace() | ||
+ | 1 0x0000000000053096 ucs_debug_save_original_sighandler() | ||
+ | 2 0x0000000000053096 ucs_set_signal_handler() | ||
+ | 3 0x0000000000053096 ucs_debug_init() | ||
+ | 4 0x000000000003f30c ucs_init() | ||
+ | 5 0x000000000000f9c3 _dl_init_internal() | ||
+ | 6 0x000000000000117a _dl_start_user() | ||
+ | </ | ||
+ | |||
+ | This is usually due to differences in processor architecure between the machine the code was compiled on and the machine the program ran on. | ||
+ | |||
+ | Specifically: | ||
+ | |||
+ | To mitigate this, either add ''# | ||
+ | |||
+ | ===== Jobs Pending with (QOSGrpCpuLimit) ===== | ||
+ | If your jobs are pending with '' | ||
+ | |||
+ | ===== Job crashes without output or error. (Especially when using scratch) ===== | ||
+ | If the directory of your output/ | ||
+ | |||
+ | This is especially frequent when using /scratch as your work directory. Your directory structure may exist on one of the scratch file system, but not on the other. So if you do not specify ''# | ||
+ | |||
+ | ===== I'm running out of space. How can I increase my quota? ===== | ||
+ | A: Write a mail to [[mailto: | ||
+ | |||
+ | If you would like to know your current quota and how much of it you are already using, you can use the command '' | ||
+ | |||
+ | ===== Can I get HPC access with my student account? ===== | ||
+ | No, you cannot use the HPC system with your account associated to the stud.uni-goettingen.de domain. You need a full GWDG account. If you are employed by the University, the Max Planck Society or the Universities Medical Centre you have an " | ||
+ | |||
+ | ===== The limit of 120 hours (i.e. five days) time limit is too short, my jobs need more time. Is that possible? ===== | ||
+ | We do not encourage longer runtimes than five days, as the probability of failure increases over time. Instead, we highly recommend job dependency chains and checkpointing your program. If those chains are not feasible in your case, please contact hpc-support@gwdg.de | ||
+ | |||
+ | ===== How much does HPC usage cost? ===== | ||
+ | All our services, including the usage of our HPC resources, is accounted in [[https:// | ||
+ | |||
+ | ===== When will my job start? ===== | ||
+ | A: You can use '' | ||
+ | |||
+ | ===== Why can't I use Gaussian? ===== | ||
+ | A: Access to Gaussian is restricted due to license requirements. More information can be found [[en: | ||
+ | |||