Caché Installation Guide - InterSystems Documentation

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Calculating System Parameters for UNIX and Linux B.1.5 Determine the Number of Routine Buffers Caché supports the following maximum value for the number of routine buffers: 65,535 Set your values to less than the maximum number of buffers listed above. B.1.6 Determine the Maximum Number of Users The maximum users allowed by Caché is the lowest of the following values: • The license limit • # of routine buffers - 1 • # of semaphores - 4 B.1.7 Determine the Maximum Database Size The ulimit parameter in UNIX determines the maximum file size available to a process. For the Caché Manager group, the value of ulimit should either be unlimited or as large as the largest database the user may have. B.2 Configure UNIX Kernel Parameters The following sections describe issues related to tuning and performance on various UNIX platforms: • Set Values for Tunable UNIX Parameters • Platform Configuration Issues B.2.1 Set Values for Tunable UNIX Parameters Caché uses a configurable number of semaphores, in sets whose size you define. The parameters SEMMNI, SEMMNS, and SEMMSL reflect the number of semaphores per set and the total number of semaphores Caché uses. The UNIX/Linux parameters that govern shared memory allocation are SHMMAX, SHMMNI, SHMSEG, and SHMALL. Caché uses shared memory and allocates one segment of shared memory; the size of this segment depends on 74 Caché Installation Guide
the area set aside for global buffers and routine buffers. It uses the following formula to determine the segment's minimum size: space required for routine buffers + space required for global buffers + 4 MB _____________________________________ = Shared memory segment size If you are distributing your data across multiple computers, Caché allocates a second segment; by default, there is no memory allocated for the second segment. (If you plan to use distributed data, contact your VAR or InterSystems support for configuration guidelines.) You can alter NBUF and NHBUF according to other system requirements. Because Caché does all its own disk buffering, you should keep NBUF and NHBUF small. The following table lists the most common names of the UNIX parameters that you may need to change, the value InterSystems recommends for each parameter, and a brief description of each. Verify that your parameter values are set to at least the minimum value. Certain parameters may not be implemented on all platforms or may be referred to differently. Refer to platform-specific tuning notes for more information. Tunable UNIX Parameters Configure UNIX Kernel Parameters Kernel Parameter CDLIMIT MSGMAX MSGMNI NOFILES SEMMNI SEMMNS Minimum Recommended Value Number of bytes in largest virtual volume 2 Number of Caché instances x 2; each Caché instance uses two message queues 35 Product of SEMMNI and SEMMSL must be greater than the # of user processes + 4 128 or ... Number of processes expected to run. If the process table might expand, use a larger number to provide for expansion. Definition Maximum size of a file. Maximum message size, in bytes. Minimum number of uniquely identifiable message queues that may exist simultaneously. Number of open files per process. Number of semaphore identifiers in the kernel; this is the number of unique semaphore sets that can be active at any one time. Total number of semaphores in the system. User processes include jobbed processes and all other semaphores required by other software. Caché Installation Guide 75
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Caché Installation Guide Version 5
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