On Fri, 13 Oct 2006 06:31:21 -0400 Chuck <[EMAIL PROTECTED]> wrote: > is there a way to see how much memory a particular guest is using? maybe > something similar to the free command? i have no memory limitations on > these first few.
i use vserver-stat for informational purposes and not for placing resource limits. to decipher vsz & rss (as used in vserver-stat), see http://oldwiki.linux-vserver.org/Memory+Management. of course, memory accounting seems to be such a variable thing from command to command and os to os (see the many internet discussions at large trying to explaining the memory usage reported by top). witnessed within vserver's very own wiki: from http://oldwiki.linux-vserver.org/Memory+Management: the RSS (resident set size) is the amount of pages which are currently in RAM (physical memory) from http://linux-vserver.org/Memory_Limits: The Resident Set Size (rss) is the amount of virtual memory (RAM + swap) that the context is allowed to use so from the vserver wiki (both old & new) it appears that for vserver-stat rss = guests' RAM usage, but for memory limits rss = guest's RAM + swap. and then in my case i use vhashify, so all guests using apache have memory shared among them, so properly accounting that shared memory is tricky (does the total shared memory get accounted to each guest, or do you divide the total shared memory equally among all guests, etc). but if you don't have to account for shared usage amoung vservers, then i presume vserver-stat is pretty accurate of each guests' specific memory usage and the difficulty is choosing policy (do you want to limit RAM usage or a guest's total memory usage, ie RAM + swap, if you can even have that granularity in memory limits). i looked into memory limits a year ago or so and gave up as i'm in control of all guests (though it would be nice to keep a process from running away, either from a memory leak or DOS attack). hopefully somebody will correct me if i'm wrong in my details above, but at least look to vserver-stat as a possible answer to your question. corey -- [EMAIL PROTECTED] _______________________________________________ Vserver mailing list [email protected] http://list.linux-vserver.org/mailman/listinfo/vserver
