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the Software
Before experimenting, you need to install RADOS and Ceph. Ceph, which is a plain vanilla filesystem driver on Linux systems (e.g., ext3 or ext4), made its way into the Linux kernel in Linux 2.6
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example creates a Crush map for a setup consisting of six OSDs (i.e., individual storage devices in servers) distributed over three racks:
crushtool --num_osds 6 -o crush.example.map --build host straw 1
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of the open source JBoss application server, which in turn is based on the JBoss Enterprise Application Platform 6, OpenShift now also supports Java EE 6, which — according to Red Hat — makes OpenShift more
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Recent trends in computing are toward more cores doing more tasks at once. These days, you are likely to have a dual- or quad-core CPU in your laptop, and perhaps 4, 6, 12, or 16 cores in your
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Servers tab shown in Figure 6.
Figure 6: Defining the real servers.
Both real web servers are defined with a weight value of 1.
Now, you are almost
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3600
0-01:00:00
5
6400
0-01:46:40
6
10000
0-02:46:40
7
14400
0-04:00:00
8
19600
0-05:26:40
9
25600
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this in the story of their successful EC2 scaling experience.
A good tool for cache control is vmtouch, which is at home on most Linux 2.6, FreeBSD 7.x, or Solaris 10 kernels; mileage may vary on other *nix variants
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repository (e.g., the CentOS 6 and CentOS 7 EPEL repositories). However, if it isn't there, it is simple to install, configure, and run. A simple and familiar ./configure
command builds the code, after which
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a000)
libpgc.so => /opt/pgi/linux86-64/16.10/lib/libpgc.so (0x00007f5bc4fc2000)
librt.so.1 => /lib64/librt.so.1 (0x00007f5bc4dba000)
libm.so.6 => /lib64/libm.so.6 (0x00007f5bc4
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on four processes is shown in Listing 6. Notice that processes 3 and 4 didn’t contribute or do anything.
Listing 5: Point-to-Point
import numpy
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank
