supercomputers

fortran: relocation truncated to fit, i can't create big arrays on server [duplicate]

由 核能气质少年 提交于 2020-01-06 05:50:52
问题 This question already has answers here : gfortran for dummies: What does mcmodel=medium do exactly? (2 answers) What does this GCC error “… relocation truncated to fit…” mean? (6 answers) Closed 2 years ago . I write a simple subroutine in fortran for a more complicated program. I need to read a file containing 3 columns of numbers (X_halo, Y_halo, Z_halo) and enter the 3 columns data into 3 arrays. In this subroutine I write the data in a file to see if I can actually read it. I have a file

Application performance vs Peak performance

由 为君一笑 提交于 2019-12-25 03:26:25
问题 I have questions about real application performance running on a cluster vs cluster peak performance. Let's say one HPC cluster report that it has peak performance of 1 Petaflops. How is this calculated? To me, it seems that there are two measuring matrixes. One is the performance calculated based on the hardware. The other one is from running HPL? Is my understanding correct? When I am reading one real application running on the system at full scale, the developer mentions that it could

What is the difference between a Cluster and MPP supercomputer architecture?

由 江枫思渺然 提交于 2019-12-20 12:07:04
问题 What is the difference between a Cluster and MPP supercomputer architecture? 回答1: In a cluster, each machine is largely independent of the others in terms of memory, disk, etc. They are interconnected using some variation on normal networking. The cluster exists mostly in the mind of the programmer and how s/he chooses to distribute the work. In a Massively Parallel Processor, there really is only one machine with thousands of CPUs tightly interconnected. MPPs have exotic memory architectures

When is SJF worse than FCFS?

由 ぃ、小莉子 提交于 2019-12-12 02:57:29
问题 In operating systems of supercomputers, which handles a big quantity of tasks at the same time, is there any situation when SJF policy is taking longer than FCFS policy, speaking of waiting time metric? It can be assumed that more than one core are present in the system. 回答1: First I thought that it is not possible, then I took some time and finally arrived at this result: Yes it can be. Suppose that ready queue is filled with processes with equal burst times(all = x): Process Burst time P1 x

Naive parallelization in a .pbs file

由 混江龙づ霸主 提交于 2019-12-11 11:22:50
问题 Is it possible to do parallelize across a for loop in a PBS file? Below is an my attempt.pbs file. I would like to allocate 4 nodes and simultaneously allocate 16 processes per node. I have successfully done this but now I have 4 jobs and I would like to send one job to each node. (I need to do this because queuing algo will make me wait a few days for submitting 4 separate job on the cluster I'm using) #!/bin/bash #PBS -q normal #PBS -l nodes=4:ppn=16:native #PBS -l walltime=10:00:00 #PBS -N

Why Torque qsub don't create output file?

由 好久不见. 提交于 2019-12-11 04:17:30
问题 I trying start task on cluster via Torque PBS with command qsub -o a.txt a.sh File a.sh contain single string: hostname After command qsub I make qstat command, that give next output: Job ID Name User Time Use S Queue ------------------------- ---------------- --------------- -------- - ----- 302937.voms a.sh user 00:00:00 E long After 5 seconds command qstat return empty output (no jobs in queue). Command qsub --version give output: version: 2.5.13 Command which qsub Output: /usr/bin/qsub

Efficiently computing floating-point arithmetic hundreds of thousands of times in Bash

由 半城伤御伤魂 提交于 2019-12-08 21:46:00
问题 Background I work for a research institute that studies storm surges computationally, and am attempting to automate some of the HPC commands using Bash. Currently, the process is we download the data from NOAA and create the command file manually, line-by-line, inputting the location of each file along with a time for the program to read the data from that file and a wind magnification factor. There are hundreds of these data files in each download NOAA produces, which come out every 6 hours

PBS script -o file to multiple locations

由 别等时光非礼了梦想. 提交于 2019-12-07 07:07:14
问题 Sometimes when I run jobs on a PBS cluster, I'd really like the joblog (-o file) in two places. One in the $PBS_O_WORKDIR for keeping everthing together and one ${HOME}/jobOuts/ for greping/awking/etc... Doing a test from the command line works with tee : echo "hello" | qsub -o `tee $HOME/out1.o $HOME/out2.o $HOME/out3.o` But once I try to put this in my PBS script, it does not work if I put it in a PBS script and qsub ####Parameterized PBS Script #### #PBS -S /bin/bash #PBS -l nodes=1 #PBS

PBS script -o file to multiple locations

由 扶醉桌前 提交于 2019-12-05 16:46:49
Sometimes when I run jobs on a PBS cluster, I'd really like the joblog (-o file) in two places. One in the $PBS_O_WORKDIR for keeping everthing together and one ${HOME}/jobOuts/ for greping/awking/etc... Doing a test from the command line works with tee : echo "hello" | qsub -o `tee $HOME/out1.o $HOME/out2.o $HOME/out3.o` But once I try to put this in my PBS script, it does not work if I put it in a PBS script and qsub ####Parameterized PBS Script #### #PBS -S /bin/bash #PBS -l nodes=1 #PBS -l walltime=0:01:00 #PBS -j oe #PBS -o `tee TEE_TEST.o TEE_TEST.${PBS_JOBID}.o` #PBS -M me@email.com

What is the difference between a Cluster and MPP supercomputer architecture?

由 眉间皱痕 提交于 2019-12-03 02:32:25
What is the difference between a Cluster and MPP supercomputer architecture? Peter Rowell In a cluster, each machine is largely independent of the others in terms of memory, disk, etc. They are interconnected using some variation on normal networking. The cluster exists mostly in the mind of the programmer and how s/he chooses to distribute the work. In a Massively Parallel Processor, there really is only one machine with thousands of CPUs tightly interconnected. MPPs have exotic memory architectures to allow extremely high speed exchange of intermediate results with neighboring processors.
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