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14%
Give your servers the once over with Nmap
31.10.2025
Home »  Archive  »  2012  »  Issue 11: Cloud...  » 
© ragsac, 123RF.com
.nmap.org (64.13.134.52): Not shown: 994 filtered ports PORT STATE SERVICE VERSION 22/tcp open ssh OpenSSH 4.3 (protocol 2.0) 25/tcp closed smtp
14%
pdsh Parallel Shell
08.07.2018
Home »  HPC  »  Articles  » 
read the hosts from a file other than the WCOLL environment variable: $ pdsh -w ^/tmp/hosts uptime 192.168.1.4:  15:51:39 up  8:35, 12 users,  load average: 0.64, 0.38, 0.20 192.168.1.250:  15:47:53 up
14%
Coordinating distributed systems with ZooKeeper
07.10.2014
Home »  Archive  »  2014  »  Issue 23: 10 Ti...  » 
Lead Image © smileus, 123RF.com
of the naming, grouping, or configurations of the menagerie. Thanks to ZooKeeper [1], which is available under the Apache 2.0 license, not every cluster has to provide a synchronization service itself
14%
Tuning loops – from loop unrolling to Duff's device
28.07.2025
Home »  Archive  »  2025  »  Issue 88: 5 Net...  » 
and resulting in speculative execution resets. Removing conditionals present inside the loop, for example, for (i = 0; i < 20; i++) { if (i % 2 == 0) { even(i); } else { odd(i); } count
14%
Proactive Monitoring
11.10.2016
Home »  Archive  »  2016  »  Issue 35: Persi...  » 
Lead Image © Tom Wang, 123RF.com
in the long term. Test Environment In the test lab, both Centos 7.1 and Ubuntu 16.04 received version 0.2.11 dated April 20, 2016. The test team simulated two data centers at different locations
14%
Fundamentals of I/O benchmarking
11.04.2016
Home »  Archive  »  2016  »  Issue 32: Measu...  » 
Lead Image © Kheng Ho Toh, 123RF.com
B blocks: 21665.1 IO/s, 169.3 MiB/s ( 1.4 Gbit/s) 16 KiB blocks: 13364.2 IO/s, 208.8 MiB/s ( 1.8 Gbit/s) 32 KiB blocks: 7621.1 IO/s, 238.2 MiB/s ( 2.0 Gbit/s) 64 KiB blocks: 4162.3 IO/s, 260.1 Mi
14%
OpenACC – Data Management
07.02.2019
Home »  HPC  »  Articles  » 
(a) copyout(f)   do j=1,n     f(i) = 2.0*e(j) +  (1.0/4.0)*(a(j)*4.14)   end   !$acc end data #pragma acc data copyin(a, b) copy(c) {   #pragma acc parallel loop {     for (int i=0; i
14%
Migrating to Azure Monitor Agent
03.08.2023
Home »  Archive  »  2023  »  Issue 76: Energ...  » 
or in the context of Application Insights. Pricing is set by region [1], but if you want to store the data for a longer period of time, the costs are considerable – currently EUR0.13/GB per month in Germany or $0.10-$0
14%
Enlarging the TCP initial window
06.10.2019
Home »  Archive  »  2019  »  Issue 53: Secur...  » 
Photo by Jani Brumat on Unsplash
's standards. TCP includes the SMTP protocol for email and HTTP/1.1 and /2.0; therefore, all TCP stack optimizations have a positive effect on performance. In this article, I take a look at the TCP initial
14%
Predicting Drive Doom
20.10.2013
Home »  HPC  »  Articles  » 
_age Always - 61 10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0 12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 20 183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 0 184 End

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