Date: Tue, 18 Mar 2003 20:28:45 -0800 From: Octavian Hornoiu <octavian@hacknslash.org> To: freebsd-questions@freebsd.org Subject: SYSVSHM Kernel options Message-ID: <3E77F1FD.8090006@hacknslash.org>
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I have been doing significant reading on the kernel options related to tuning PostgreSQL and I am wondering how to best go about increasing the paged memory available to FreeBSD. I have read the following suggestions: options SYSVSHM options SHMMAXPGS=4096 (place total shared mem here) options SHMSEG=256 options SYSVSEM options SEMMNI=256 options SEMMNS=512 options SEMMNU=256 options SEMMAP=256 AND /"You might also want to use the sysctl setting to lock shared memory into RAM and prevent it from being paged out to swap, e.g. kern.ipc.shm_use_phys" /My question is, should i go ahead and increase the SHMMAXPGS value to any amount of memory that i choose? what are the consequences of doing this on a freebsd system? What problems might be caused and will this degrade the rest of the system? What is the affect of locking shared memory into RAM using the sysctl utility? I have never tuned the system in this way before and I am wary of messing around. Thanks! octavian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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