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Security data analytics and visualization with R
05.12.2014
Home »  Archive  »  2014  »  Issue 24: Visua...  » 
Lead Image © Rancz Andrei, 123RF.com
(HostCt, ServerOwner, Date) %>% 106 arrange(desc(HostCt)) 107 head12 <- head(top12, 25) 108 109 mergedTop25 <- rbind(head1,head2,head3,head4,head5, head6,head7,head8,head9,head10,head11,head12) 110 111
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Embarrassingly parallel computation
01.06.2024
Home »  Archive  »  2024  »  Issue 81: Load...  » 
Lead Image © Lucy Baldwin, 123RF.com
Laboratory hosts a number of excellent parallel programming tutorials at its Leadership Computing Facility, including one demonstrating the Monte Carlo method in both serial and parallel implementations [6]. I
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Predicting Drive Doom
20.10.2013
Home »  HPC  »  Articles  » 
. The output for the Samsung SSD is: [root@home4 ~]# smartctl -i /dev/sdb smartctl 5.43 2012-06-30 r3573 [x86_64-linux-2.6.32-358.18.1.el6.x86_64] (local build) Copyright (C) 2002-12 by Bruce Allen, http
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Understanding Layer 2 switch port security
22.12.2017
Home »  Archive  »  2017  »  Issue 42: Secur...  » 
Lead Image © Taffi, Fotolia.com
a switch from attack. Layer 2 Switch Operation A switch provides Data Link Layer (or Layer 2) connectivity on an Ethernet network. Devices transmit data frames based on a unique 48-bit MAC address (Figure
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S.M.A.R.T., smartmontools, and drive monitoring
09.01.2013
Home »  Archive  »  2013  »  Issue 18: New W...  » 
Lead Image © _fla, 123RF.com
. Listing 1 Samsung SSD Inquiry [root@home4 ~]# smartctl -i /dev/sdb smartctl 5.43 2012-06-30 r3573 [x86_64-linux-2.6.32-358.18.1.el6.x86_64] (local build) Copyright (C) 2002-12 by Bruce Allen, http
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Using a Bash script to mirror external monitors
10.06.2015
Home »  Archive  »  2015  »  Issue 27: Fault...  » 
Lead Image © bowie15, 123RF.com
"} ) 09 10 # force called programs to english output 11 LANG=C LC_ALL=C 12 13 function die { 14 echo 1>&2 "$*" 15 exit 10 16 } 17 18 function get_display_resolution { 19 local find_display="$1
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Tuning I/O Patterns in Python
18.12.2013
Home »  HPC  »  Articles  » 
(One-by-One) 1 #include 2 3 /* Our structure */ 4 struct rec 5 { 6 int x,y,z; 7 float value; 8 }; 9 10 int main() 11 { 12 int counter; 13 struct rec my_record; 14 int counter_limit; 15
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Parallel Shells: Run Commands on Multiple Nodes
02.07.2014
Home »  HPC  »  Articles  » 
: [laytonjb@home4 ~]$ pdsh -w 192.168.1.250 uname -r 192.168.1.250: 2.6.32-431.11.2.el6.x86_64 The -w option means I am specifying the node(s) that will run the command. In this case, I specified the IP
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Tuning I/O Patterns in C
31.07.2013
Home »  HPC  »  Articles  » 
Code Example 1 #include 2 3 /* Our structure */ 4 struct rec 5 { 6 int x,y,z; 7 float value; 8 }; 9 10 int main() 11 { 12 int counter; 13 struct rec my
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Retrieving Windows performance data in PowerShell
10.04.2015
Home »  Archive  »  2015  »  Issue 26: OpenS...  » 
Lead Image © andresr, fotolia.com
to see whether the available memory drops below 500MB. The script then runs through the freely extensible performance counters by server and checks the results. If a threshold is over- or undershot

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