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Operating Systems
Solaris
No Space Left - Memory/Swap issue
Post 302497661 by aychbee45 on Thursday 17th of February 2011 06:01:26 PM
02-17-2011
Quote:
Are you asking why swap is necessary? It is how this system works 
It needs to be always sure that when available physical memory drops to zero, it will have disk space to send processes and their data to, to free it up. And from your vmstat output it seems that you may have real swap shortage. ~500MB of free swap is really not enough.
It needs to be always sure that when available physical memory drops to zero, it will have disk space to send processes and their data to, to free it up. And from your vmstat output it seems that you may have real swap shortage. ~500MB of free swap is really not enough.I realize that part of physical memory is used for swap and then there is "disk" swap space. I'm just not understanding why our system isn't using the remaining 900MB of physical (or at least 500 of it, with the 500MB remaining swap).
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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The tunable is obsolete.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)