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Recommended Kernel Tuning for TRU64 Unix 5.1
v 1.0 ( 2001 01 30 ) by mark These are settings I have found to work well on high performance Compaq alpha machines (eg. 4+ gig RAM, 2+ proc). Some are based on known best values, some on hearsay. If you want to be anal you can match your max proc address space and data sizes to be less than the total vm (swap + physical memory). I just made mine big be because I wasn't worried about hitting the limit. Anyway, if programs hit that limit (exceed vm or proc max) the result is the probably the same: crap out. Insert these values (be sure to include subsys heading) at the end of your /etc/sysconfigtab file. Reboot. ## ipc is tuned for informix database ## ipc: ## this is the max shm-max value shm-max = 2147483647 shm-mni = 2048 shm-seg = 1024 sem-mni = 400 sem-msl = 1600 sem-opm = 400 sem-ume = 400 ssm-threshold = 0 proc: ## increase this if you run many procs rather than many threads max-proc-per-user = 1024 ## i recommend 512->1024 users per CPU for network servers ## this value is used as a base to generate others ## such as max file descriptors maxusers = 2048 ## set high to accommodate heavily threaded database max-threads-per-user = 4096 ## 8 gigs -- will your process stack be bigger? unlikely! per-proc-stack-size = 8589934592 max-per-proc-stack-size = 8589934592 ## 1 terabyte per-proc-data-size = 1099511627776 max-per-proc-data-size = 1099511627776 per-proc-address-space = 1099511627776 max-per-proc-address-size = 1099511627776 ## tuning for raw disk access by database rt: aio_max_percent = 3 aio_task_max_num = 60108 aio_listio_max_num = 256 sigqueue_max_num = 256 ## boosted socket connection socket: ## increase TCP connection listen queue size somaxconn = 65535 sominconn = 65535 ## increase (to 4 meg) size of socket buffer sb_max = 4194304 ## more network tuning inet: ## maximum number of ip input queues ipqs = 16 ## number of tcp hash tables tcbhashnum = 16 ## max tcp segment size tcp_mssdflt = 1460 ## send and receive spaces (set to max) tcp_recvspace = 61440 tcp_sendspace = 61440 Compaq's guide to system performance and tuning for version OSF1 v5.1 You can check your current values by running: sysconfig -q (subsys) (variable) ie.: sysconfig -q inet ipqs |
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