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Full Discussion: No core dump
Top Forums UNIX for Dummies Questions & Answers No core dump Post 302483353 by DGPickett on Sunday 26th of December 2010 12:47:35 PM
Old 12-26-2010
Yes, disk space, swap space, swap rate are still challenges. I wish they would focus on making priority and sharing more intelligent in the kernel. For instance, if the system seems to be thrashing, then a "max pages owned by any process" limit could be lowered just enough to make the page generators write over their own pages while leaving a reasonable working set for the rest. If a page like a library is disowned by a process, another process may roll it back in and own it to the benefit of the heavy user, but you still do not need to choke it past that. It might be a process with a big working set, bigger than RAM, and giving it most to RAM, but not all, is good. Something like a big sort!

I wish there were separate queues for every priority/nice at every resource, so a nice -19 job can beat on disk as hard as it wants and still leave the door open for more prioritized jobs. Of course, if you want to do disk I/O on a spindle/arm that is reading for someone else, that is a modest delay on every I/O, and some devices have deep internal queues not prioritized.

For swap, you usually want the hammer to fall on a relatively recent piggy app.: less likely approved for so much swap, more relief than small proc's, but I suppose you might have to bundle proc's by terminal and then id to deal with the accidental wave of mosquitoes sort of swap problem. Maybe some sort of slow fork for groups that get too busy, not kills!
Last edited by DGPickett; 12-26-2010 at 02:14 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       The tunable is obsolete.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)
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