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Managing Resources In this example, the value of the PHYSPAGES parameter for Container 101 is set to 65536. The PHYSPAGES parameter displays the amount of RAM in 4-KB pages, so the total amount of RAM set for Container 101 equals to 256 MB. The value of the SWAPPAGES parameter is also set to 256 MB. To configure the amounts of RAM and swap space for Container 101, use the --physpages and --swappages options of the vzctl set command. For example, you can execute the following command to set the amount of RAM and SWAP in Container 101 to 1 GB and 512 MB, respectively: # pctl set 101 --physpages 1G --swappages 512M --save Saved parameters for Container 101 For more information on --physpages and --swappages, consult the <strong>Parallels</strong> Containers 4.6 Reference Guide. Configuring the Memory Allocation Limit When an application starts in a Container, it allocates a certain amount of memory for its needs. Usually, the allocated memory is much more than the application actually requires for its execution. This may lead to a situation when you cannot run an application in the Container even if it has enough free RAM. To deal with such situations, the VSwap memory management scheme introduces a new parameter—VM_Overcommit. Using this parameter, you can configure the amount of memory applications in a Container may allocate, irrespective of the amount of RAM and swap space assigned to the Container. The amount of memory that can be allocated by applications of a Container is the sum of RAM and swap space set for this Container multiplied by a memory overcommit factor. In the default (basic) Container configuration file, this factor is set to 1.5. For example, if a Container is based on the default configuration file and assigned 1 GB of RAM and 512 MB, the memory allocation limit for the Container will be 2304 MB. You can configure this limit and set it, for example, to 3 GB by running this command: # vzctl set 101 --vm_overcommit 2 --save Saved parameters for Container 101 This command uses the factor of 2 to increase the memory allocation limit to 3 GB: (1 GB of RAM + 512 MB of swap) * 2 = 3 GB Now applications in Container 101 can allocate up to 3 GB of memory, if necessary. Note: For more information on Container configuration files, see Managing Container Resources Configurations (p. 150). 142
Tuning VSwap Managing Resources The new management scheme can be extended by using UBC parameters. For example, you can set the numfile parameter to configure the maximal number of processes and threads a Container may create or the numproc parameter to specify the number of files that may be opened by all processes in the Container. For detailed information on using UBC parameters, consult the Administrator's Guide to Managing UBC Resources. 143
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Parallels Server 5 Bare Metal User'
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Contents Introduction .............
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Contents Making Screenshots .......
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Contents Setting Up Private Network
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C HAPTER 1 Introduction This chapte
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Documentation Conventions Introduct
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Feedback Introduction If you spot a
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Learning Parallels Server 5 Bare Me
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Basics of OS Virtualization Learnin
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Parallels Server Bare Metal Configu
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Parallels Virtual Machines Learning
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Virtual Machine Files Learning Para
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Managing Virtual Machines and Conta
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Supported Guest Operating Systems M
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Choosing a Container ID Managing Vi
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Configuring Network Settings Managi
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Configuring the Default Directories
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Managing Parallels Server Bare Meta
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Managing Parallels Server Bare Meta
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Managing Licenses Installing the Li
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Managing Licenses Transferring the
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Managing Licenses Viewing the Licen
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Managing Licenses 202 key_number="P
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Keeping Your System Up To Date Upda
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Keeping Your System Up To Date 210
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Advanced Tasks Creating VZFS Symlin
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Advanced Tasks Capabilities Defined
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Advanced Tasks Creating Customized
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Advanced Tasks # vzmktmpl /root/cen
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Advanced Tasks 224 • %packages: a
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Advanced Tasks # rpm -ihv /root/mys
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Advanced Tasks Obtaining Server ID
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Advanced Tasks Setting Immutable an
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Advanced Tasks LowTotal: 8000 kB Lo
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Advanced Tasks Loading iptables Mod
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Advanced Tasks Creating Configurati
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Advanced Tasks %KM Kernel memory us
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Advanced Tasks Checking partition a
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C HAPTER 10 Troubleshooting This ch
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Troubleshooting (The 65531 ports sc
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Troubleshooting Saving Kernel Fault
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Troubleshooting Failure to Start a
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Troubleshooting Getting Technical S
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Troubleshooting In this window, you
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Troubleshooting Establishing Secure
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C HAPTER 11 Glossary This glossary
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Index Index A About This Guide - 9
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Index Managing Memory Resources for
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