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There are three types of partition definitions, and each provides different functionality for different situations: Primary partitions These are the standard physical partitions you would use if you did not need to segment your disk too much. Linux supports a total of four primary partitions on a disk, which is usually a limitation for people with large disks who would like to have some segmentation in the way they organize their data or critical files. Extended partition An extended partition is a portion of a disk in which logical partitions can be created (see the next bullet item). It is a special type of partition because it cannot directly hold any data itself but contains other partitions that can themselves hold data.

where sg is the frequency of successful mutations over t iterations; cd and Ci are constants. A successful mutation is one that results in an offspring with better fitness than the parent. Schwefel proposed the following mutation strategy for the standard deviations [Schwefel 1974]: ag+ln = ag,neT^ (12.5) where r = \fl, and T ~ N(Q,1). Another different strategy was proposed by Fogel [Fogel 1992]:

Unix-like systems also tell us about memory performance through the virtual memory statistics, e.g. the vmst at command. This command gives a different output on each operating system, but summarizes the amount of free memory as well as paging performance, etc. It can be used to get an idea of whether or not the system is paging a lot (a sign that memory is low). Another way of seeing this is to examine the amount of swap space which is in use:

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Two types of devices can represent physical and virtual devices in Linux: Character devices are those whose communication is based on a serial communication character by character. Common character devices are your serial ports (/dev/ttyS0, /dev/ttyS1, and so on) and the /dev/random device, which is a virtual device that if read will just feed out a string of random bytes. The latter is useful for creating an empty file that contains actual data. Block devices are those whose communication is based on multiple bytes that are read and written as a unit known as a block. All disk devices are block devices. You will come across more block and character devices throughout the book.

Logical partitions This is a special type of partition that is not a single physical portion of your disk, as a primary partition is, but instead resides inside an extended partition. After creating an extended partition, creating subsequent partitions will offer you the choice of creating either a primary partition (remember, only four per disk!) or a logical partition that resides in an extended partition. If you have never encountered partitions before, they can be very daunting. With this in mind, Figure 3-1 shows a logical view of sample partitions on a hard disk. This is not necessarily how partitions are physically laid out on disks but provides a good conceptual view of how they work together. Once a partition has been created, it is represented in Linux by a device name. Devices are represented by files in /dev, and the devices we are interested in at the moment are the block devices that represent disk systems. We will concentrate on the common IDE (/dev/hdx) and SCSI (/dev/sdx) disks.

Excessive network traffic is also a cause of impaired performance. We should try to eliminate unnecessary network traffic whenever possible. Before any complex analysis of network resources is undertaken, we can make sure that we have covered the basics: Make sure that there is a DNS server on each large subnet to avoid sending unnecessary queries through a router. (On small subnets this would be overkill.) Make sure that the name servers themselves use the loop back address 127 . 0. 0 .1 as primary name server on Unix-like hosts, so that we do not cause collisions by having the name server talk to itself on the public network. Try to avoid distributed file accesses on a different subnet. This loads the router. If possible, file servers and clients should be on the same subnet. If we are running X-windows, make sure that each workstation uses has its DISPLAY variable set to : 0 . 0 rather than hostname : 0 . 0, to avoid sending data out onto the network, only to come back to the same host.

This section uses the fdisk command to view, edit, and create partitions on a sample SUSE system. If you do not have available, unallocated disk space to experiment with on your existing system, this section provides examples of the most common reasons you would use fdisk to carry out partitioning work so that you can see how and when you might use fdisk in the future.

2. Mutate the genetic material Gg,n for each individual:

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