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grid [2017/10/02 17:08]
popel |
grid [2017/10/02 17:33]
popel |
| LRC (Linguistic Research Cluster) is a name of ÚFAL's computational grid/cluster, which has (as of 2017/09) about 1600 CPU cores (115 servers + 2 submission heads), with a total 10 TiB of RAM. It uses [[https://en.wikipedia.org/wiki/Oracle_Grid_Engine|(Sun/Oracle/Son of) Grid Engine]] software (SGE) for job scheduling etc. You can submit many computing tasks (jobs) at once, they will be placed in a queue and once a machine (slot) with the required capabilities (e.g. RAM, number of cores) is available, your job will be executed (scheduled) on this machine. This way we can maximize the usefulness of the computing resources and divide it among users in a fair way. | LRC (Linguistic Research Cluster) is a name of ÚFAL's computational grid/cluster, which has (as of 2017/09) about 1600 CPU cores (115 servers + 2 submission heads), with a total 10 TiB of RAM. It uses [[https://en.wikipedia.org/wiki/Oracle_Grid_Engine|(Sun/Oracle/Son of) Grid Engine]] software (SGE) for job scheduling etc. You can submit many computing tasks (jobs) at once, they will be placed in a queue and once a machine (slot) with the required capabilities (e.g. RAM, number of cores) is available, your job will be executed (scheduled) on this machine. This way we can maximize the usefulness of the computing resources and divide it among users in a fair way. |
| |
| If you need GPU processing, see a special page about our [[:gpu|GPU cluster called DLL]] (which is actually a subsystem of LRC with independent queue ''gpu.q''). | If you need GPU processing, see a special page about our [[:gpu|GPU cluster called DLL]] (which is actually a subsystem of LRC with an independent queue ''gpu.q''). |
| | TODO: describe alternatives, e.g.: ms-guests tiny cluster, MetaCentrum / Cesnet cluster (all MFF students can use it), Amazon EC2, Microsoft Azure (some colleagues may have sometime free vouchers). |
| |
| ===== List of Machines ===== | ===== List of Machines ===== |
| ===== Job monitoring ===== | ===== Job monitoring ===== |
| |
| * ''qstat [-u user]'' -- seznam úloh aktuálně běžících / ve frontě | * ''qstat [-u user]'' -- print a list of running/waiting jobs of a given user |
| * ''qhost'' -- dostupné zdroje | * ''qhost'' -- print available/total resources |
| * ''/SGE/REPORTER/LRC-UFAL/bin/lrc_users_real_mem_usage -u user -w'' -- aktuální využití paměti uživatelem | * ''/SGE/REPORTER/LRC-UFAL/bin/lrc_users_real_mem_usage -u user -w'' -- current memory usage of a given user |
| * ''/SGE/REPORTER/LRC-UFAL/bin/lrc_users_limits_requested -w'' -- nárokované požadavky uživatelů | * ''/SGE/REPORTER/LRC-UFAL/bin/lrc_users_limits_requested -w'' -- required resources of all users |
| * ''/SGE/REPORTER/LRC-UFAL/bin/lrc_nodes_meminfo'' -- vypis vsech uzlu a stav vytiznosti pameti. | * ''/SGE/REPORTER/LRC-UFAL/bin/lrc_nodes_meminfo'' -- memory usage of all nodes |
| * mem_total: celkova pamet uzlu | * mem_total: |
| * mem_free: tedy kolik je jeste volne pameti z pametove quoty uzlu | * mem_free: total memory minus reserved memory (using ''qsub -l mem_free'') for each node |
| * act_mem_free: kolik uzlu OPRAVDU zbyva volne pameti | * act_mem_free: really free memory |
| * mem_used: kolik je pameti skutecne pouzito | * mem_used: really used memory |
| * ''/SGE/REPORTER/LRC-UFAL/bin/lrc_state_overview'' -- celkový přehled o clusteru | * ''/SGE/REPORTER/LRC-UFAL/bin/lrc_state_overview'' -- overall summary (with per-user stats for users with running jobs) |
| * celkovy pocet jader, pocet vyuzitych jader | * ''cat /SGE/REPORTER/LRC-UFAL/stats/userlist.weight'' -- all users sorted according to their activity (number of submitted jobs × their average duration), updated each night |
| * celkova velikost RAM, kolik je ji fyzicky nepouzite, kolik je ji jeste nerezervovane | * [[https://ufaladm2.ufal.hide.ms.mff.cuni.cz/munin/ufal.hide.ms.mff.cuni.cz/lrc1.ufal.hide.ms.mff.cuni.cz/lrc_users.html|Munin: graph of cluster usage by day and user]] (accessible only from ÚFAL network, after accepting a security exception) |
| * po jednotlivych uzivatelich (zrovna pocitajicich) -- kolik jim bezi uloh, kolik jich maji ve fronte a kolik z nich je ve stavu hold | |
| * ''cat /SGE/REPORTER/LRC-UFAL/stats/userlist.weight'' -- seznam uživatelů clusteru seřazený podle dosavadní aktivity (počet odeslaných úloh × čas, který běžely), aktualizovaný každý den v noci | |
| * [[https://ufaladm2.ufal.hide.ms.mff.cuni.cz/munin/ufal.hide.ms.mff.cuni.cz/lrc1.ufal.hide.ms.mff.cuni.cz/lrc_users.html|Munin: graf vytíženosti clusteru podle uživatelů]] (viditelný pouze ze sítě ÚFAL) | |
| |
| === Other === | ===== Other ===== |
| * You can use environment variables ''$JOB_ID'', ''$JOB_NAME''. | * You can use environment variables ''$JOB_ID'', ''$JOB_NAME''. |
| * One job can submit other jobs (but be careful with recursive:-)). A job submitted to the CPU cluster may submit GPU jobs (to the ''qpu.q'' queue). | * One job can submit other jobs (but be careful with recursive:-)). A job submitted to the CPU cluster may submit GPU jobs (to the ''qpu.q'' queue). |
