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Real-World HPC: Setting Up an HPC Cluster
04.11.2011
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through NAT. Listing 1 has some critical settings for the /etc/sysconfig/iptables  file. Listing 1: /etc/sysconfig/iptables *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :RH
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TCP Stealth hides open ports
10.04.2015
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Lead Image © momo5287, 123RF.com
\ ID.\0\0 \0\0\0\0\0\0\0 ...\0\0\0\0\0\0\0\0\0\ 0\0", 64) = 0 If you trace setsockopt() with Strace (Listing 2), you can easily see that TCP Stealth does not perform any encryption. Despite this, TCP
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Tips and Tricks for Containers
12.05.2020
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): root@c31656cbd380:/# apt-get update Get:1 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB] ... Fetched 18.0 MB in 9s (1960 kB/s) After the package repositories are synced, I can
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Julia Distributed Arrays
15.08.2012
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, elements of the distributed array, j (created above) can be changed (not just the local references; in this case, rows 1-2 and columns 1-8): julia> j[2,2]=0; julia> j[8,8]=0; julia> print(j); 8x8 Float
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Admin as a service with sysstat for ex-post monitoring
01.06.2024
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Lead Image © Levente Janos, 123RF.com
ALL 04 $ sar -f /var/log/sysstat/sa07 -s 23:30:00 -e 23:55:00 -P 1,2 However, filtering by specific days is often not enough, so you can filter for a time interval by passing -s [
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Understanding Layer 2 switch port security
22.12.2017
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Lead Image © Taffi, Fotolia.com
) win 512 a:60:b2:3d:fc:af d3:7c:5b:36:4a:61 0.0.0.0.17578 > 0.0.0.0.4432: S 727135709:727135709(0) win 512 18:75:26:4c:a8:23 10:81:2a:12:e1:be 0.0.0.0.42271 > 0.0.0.0.61161: S 1071867223:1071867223(0
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Machine learning and security
02.02.2021
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Lead Image © Vlad Kochelaevskiy, 123RF.com
.sin(periods * 2 * np.pi * t) 12 return max(value, 0.0) 13 else: 14 value = np.sin(periods * 2 * np.pi * t) 15 return max(value, 0.0) 16 17 # building the data vector 18 my_data = [] 19 i = 0 20 while
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Resource Management with Slurm
05.11.2018
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Name=slurm-node-0[0-1] Gres=gpu:2 CPUs=10 Sockets=1 CoresPerSocket=10 \ ThreadsPerCore=1 RealMemory=30000 State=UNKNOWN PartitionName=compute Nodes=ALL Default=YES MaxTime=48:00:00 DefaultTime=04:00:00 \ Max
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Resource Management with Slurm
13.12.2018
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Lead Image © Vladislav Kochelaevs, fotolia.com
.conf file generated by configurator.html. 08 # 09 # See the slurm.conf man page for more information. 10 # 11 ClusterName=compute-cluster 12 ControlMachine=slurm-ctrl 13 # 14 SlurmUser=slurm 15 Slurmctld
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mpi4py – high-performance distributed Python
30.11.2020
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Lead Image © liu liming, 123RF.com
): 11 12 s = 0.0 13 s += h * f(a) 14 for i in range(1, n): 15 s += 2.0 * h * f(a + i*h) 16 # end for 17 s += h * f(b) 18 return (s/2.) 19 # end def 20 21 22 # Main section 23 comm = MPI

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