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UNIX for Dummies Questions & Answers
Size of swap partition during installation
Post 302353930 by Corona688 on Wednesday 16th of September 2009 02:06:53 PM
09-16-2009
The "twice as much swap as ram" rule of thumb comes from the good 'ol days when you never, ever had enough RAM and always burdened your system to the breaking point. The performance cost of waiting for swap is much higher than it used to be since CPU and RAM have sped up much faster than disk seeking; you'd need a RAID for multiple gigs of swap to be useful now. I never give more than a gig of swap for single-disk systems, usually just 512M.
That sounds like a good system to install Linux on.
Old enough to be cheap, powerful enough to be useful. We used one for 3 years for everything you want plus file storage, DVD burning, and a hefty live database on top of that, often at the same time. A PIII can do a lot if you don't put Windows on it...
That sounds like a good system to install Linux on.
Old enough to be cheap, powerful enough to be useful. We used one for 3 years for everything you want plus file storage, DVD burning, and a hefty live database on top of that, often at the same time. A PIII can do a lot if you don't put Windows on it...Last edited by Corona688; 09-16-2009 at 03:18 PM..
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LEARN ABOUT HPUX
swapmem_on
swapmem_on(5) OBSOLETE swapmem_on(5) NAME
swapmem_on - OBSOLETE kernel tunable parameter DESCRIPTION
The tunable is obsolete. Processes will always be allowed to use pseudo-swap space if it is available. In previous versions of HP-UX, system configuration required sufficient physical swap space for the maximum possible number of processes on the system. This is because HP-UX reserves swap space for a process when it is created, to ensure that a running process never needs to be killed due to insufficient swap. This was difficult, however, for systems needing gigabytes of swap space with gigabytes of physical memory, and those with workloads where the entire load would always be in core. This tunable was created to allow system swap space to be less than core memory. To accomplish this, a portion of physical memory is set aside as "pseudo-swap" space. While actual swap space is still available, processes still reserve all the swap they will need at fork or execute time from the physical device or file system swap. Once this swap is completely used, new processes do not reserve swap, and each page which would have been swapped to the physical device or file system is instead locked in memory and counted as part of the pseudo-swap space. WARNINGS
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun- able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see at AUTHOR
was developed by HP. Tunable Kernel Parameters swapmem_on(5)