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services:computing:hpc [2021/05/24 15:06]
Piero Calucci filesystems & backups
services:computing:hpc [2021/09/06 12:13] (current)
Piero Calucci [Hardware and Software]
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-Ulysses v2 can be accessed ​via the login nodes at ''​frontend1.hpc.sissa.it''​ or ''​frontend2.hpc.sissa.it''​ from SISSA network or from SISSA [[:​vpn|VPN]]. More access options might be made available in due time.+SSH access to Ulysses v2 is provided ​via the login nodes at ''​frontend1.hpc.sissa.it''​ or ''​frontend2.hpc.sissa.it''​ from SISSA network or from SISSA [[:​vpn|VPN]]. More access options might be made available in due time.
  
 ===== Hardware and Software ===== ===== Hardware and Software =====
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 The software tree is the same you have on Linux workstations,​ with the same [[services:​modules|Lmod modules]] system (with the only exception of desktop-oriented software packages). The software tree is the same you have on Linux workstations,​ with the same [[services:​modules|Lmod modules]] system (with the only exception of desktop-oriented software packages).
 +
 +A small number of POWER9-based nodes are also available (2 sockets, 16 cores, 4 threads per core; 256GB RAM) with 2 or 4 Tesla V100. Please note that you cannot run x86 code on POWER9. For an interactive shell on a P9 machine, please type ''​p9login''​ on frontend[12].
  
 ===== Queue System =====  ===== Queue System ===== 
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   * **''​long1''​** and **''​long2''​**:​ max 8 nodes, max 48h   * **''​long1''​** and **''​long2''​**:​ max 8 nodes, max 48h
   * **''​gpu1''​** and **''​gpu2''​**:​ max 4 nodes, max 12h   * **''​gpu1''​** and **''​gpu2''​**:​ max 4 nodes, max 12h
 +  * **''​power9''​**:​ max 2 nodes, max 24h
  
 <note tip>​Please note that hyperthreading is enabled on all nodes (it was disabled on old Ulysses). If you **do not** want to use hyperthreading,​ the ''​%%--hint=nomultithread%%''​ options to srun/sbatch will help. <note tip>​Please note that hyperthreading is enabled on all nodes (it was disabled on old Ulysses). If you **do not** want to use hyperthreading,​ the ''​%%--hint=nomultithread%%''​ options to srun/sbatch will help.
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 </​code>​ </​code>​
  
 +<note warning>​Please note that MPI jobs are only supported if they allocate all available core/​threads on each node (so 20c/40t on *1 partitions and 32c/64t on *2 partitions. In this context, //not supported// means that jobs using fewer cores/​threads than available may or may not work, depending on how cores //not// allocated to your job are used.</​note>​
 ===== Filesystem Usage and Backup Policy ===== ===== Filesystem Usage and Backup Policy =====