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27%
Fundamentals of I/O benchmarking
11.04.2016
Home »  Archive  »  2016  »  Issue 32: Measu...  » 
Lead Image © Kheng Ho Toh, 123RF.com
(512 MB) copied, 49.1424 s, 10.4 MB/s If you want to empty the read and write cache for benchmark purposes, you can do so using: sync; echo 3 > /proc/sys/vm/drop_caches Sequential access
27%
Visualizing containers with clarity
29.09.2020
Home »  Archive  »  2020  »  Issue 59: Custo...  » 
Lead Image © Ulrich Müller, 123RF.com
-line operations. To install Dockly [3], you can choose one of two routes: with npm (see the "Installation by npm" box for that route) and in a Docker container. For context, on my laptop, about 43MB of file space
26%
Rethinking RAID (on Linux)
16.03.2021
Home »  HPC  »  Articles  » 
, ioengine=libaio, iodepth=32 fio-3.12 Starting 1 process Jobs: 1 (f=1) test: (groupid=0, jobs=1): err= 0: pid=5872: Sat Jan  9 16:35:08 2021   read: IOPS=251k, BW=979MiB/s (1026MB/s)(2045MiB/2089msec
26%
Building Virtual Images with BoxGrinder and VMBuilder
07.01.2013
Home »  Articles  » 
 
of Ubuntu on the virtual machine. The virtual machine uses one CPU (core) and 128MB of RAM. The filesystem is created as a QCOW2 image file of 4GB. Of these, 3GB are reserved for the system partition
26%
A Btrfs field test and workshop
31.10.2025
Home »  Archive  »  2012  »  Issue 11: Cloud...  » 
© Adrian Hillman, 123RF.com
(depending on the RAID level). These chunks are usually 1GB for data and 256MB for metadata. One exception is the first metadata chunk, which mkfs.btrfs creates 1GB in size, assuming there is enough space
26%
Using the MQTT IoT protocol for unusual but useful purposes
03.12.2015
Home »  Archive  »  2015  »  Issue 30: OpenD...  » 
Lead Image © Heiko Küverling, 123RF.com
. Clients don't actually know whether they really see all the messages that arrive at the broker; the broker ACLS decide this. Messages transport payloads; payload data can also be binary and be up to 256MB
25%
Rethinking RAID (on Linux)
25.03.2021
Home »  Archive  »  2021  »  Issue 62: Lean...  » 
Lead Image © nikkikii, 123RF.com
, ioengine=libaio, iodepth=32 fio-3.12 Starting 1 process Jobs: 1 (f=1) test: (groupid=0, jobs=1): err= 0: pid=5956: Sat Jan 9 16:38:53 2021 read: IOPS=256k, BW=998MiB/s (1047MB/s)(2045MiB/2049msec
25%
Building a virtual NVMe drive
25.03.2020
Home »  Archive  »  2020  »  Issue 56: Secur...  » 
Lead Image © lassedesignen, 123RF
7 1 56008 loop1 06 7 2 56184 loop2 07 7 3 91264 loop3 08 259 0 244198584 nvme0n1 09 8 0 488386584 sda 10 8 1 1024 sda1 11
25%
Speed up your MySQL database
11.02.2016
Home »  Archive  »  2016  »  Issue 31: Tunin...  » 
Lead Image © Mikhail Dudarev, 123RF.com
( NULL, 'Row 3', NULL); SELECT SLEEP(1); 08 09 mysql> INSERT INTO data_random VALUES ( MD5(CURRENT_TIMESTAMP()), 'Row 1', NULL); SELECT SLEEP(1); 10 mysql> INSERT INTO data_random VALUES ( MD5(CURRENT
25%
Creating Virtual SSDs
21.01.2020
Home »  HPC  »  Articles  » 
    7        1      56008 loop1 06    7        2      56184 loop2 07    7        3      91264 loop3 08  259        0  244198584 nvme0n1 09    8        0  488386584 sda 10    8        1       1024 sda1 11

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