Date: Mon, 20 Jun 2005 22:01:42 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Francisco Reyes <lists@natserv.com> Cc: FreeBSD Questions List <questions@freebsd.org> Subject: Re: When does swap decreases Message-ID: <20050621030141.GH8497@dan.emsphone.com> In-Reply-To: <20050620225204.F41158@zoraida.natserv.net> References: <20050620141439.S36309@zoraida.natserv.net> <20050620182430.GE8497@dan.emsphone.com> <20050620144631.F37558@zoraida.natserv.net> <20050620185545.GF8497@dan.emsphone.com> <20050620225204.F41158@zoraida.natserv.net>
next in thread | previous in thread | raw e-mail | index | archive | help
In the last episode (Jun 20), Francisco Reyes said: > On Mon, 20 Jun 2005, Dan Nelson wrote: > > When the system is low on memory, it will force the least used > > blocks of memory to swap. It will not free the swap space until > > the process owning them exits > > Have not found any program to see what programs are using the swap, > but as I think about it, the current method is not very "smart". I > guess any other method is difficult to implement. > > How wonder how the current method affects performance. Basically if > there is a surge of memory usage and processes start that use the > swap and these processes are long lived.. I wonder if performance > will be affected. There may even be a performance gain, since if the system comes under memory pressure again, some of the in-memory pages of those long-lived processes previously copied to swap may still be clean, and the system won't even have to page them out; it can simply free the RAM. I can't think of any way for there to be a performance hit, unless you actually run out of swap. -- Dan Nelson dnelson@allantgroup.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050621030141.GH8497>