Thanks everybody by answering my queries. I am also thinking in the same way that using "drop_caches" is not the solution rather it is dangerous.
###to "clear the memory" and found some other solution. :) Would you pl. let me know what is the solution you have :) Thanks again to all of you. --- On Fri, 9/24/10, Langley, Morgan (GE Capital) <[email protected]> wrote: > From: Langley, Morgan (GE Capital) <[email protected]> > Subject: Re: [rhelv5-list] Tuning parameter drop_caches > To: "Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list" > <[email protected]> > Date: Friday, September 24, 2010, 1:40 AM > I can confirm this, drop_caches > caused one of our RHEL 4 servers to crash. After this > experience, the application admin refrained from asking us > to "clear the memory" and found some other solution. :) > > Morgan > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] > On Behalf Of Corey Kovacs > Sent: Thursday, September 23, 2010 11:14 PM > To: Red Hat Enterprise Linux 5 (Tikanga) discussion > mailing-list > Subject: Re: [rhelv5-list] Tuning parameter drop_caches > > drop_caches is _not_ a tuning parameter, rather it's a > tuning tool. > You should _never_ do this on a production machine as very > bad things > can happen. > > > It's supposed to be used to _reset_ a systems mem to > a zero point in > order to allow you to make changes and evaluate there > effect, or debug > a leak or what have you. > > -C > > > On Thu, Sep 23, 2010 at 9:22 PM, Kyle O'Donnell <[email protected]> > wrote: > > you shouldn't *need* to do this at all. > > > > This gives a nice overview: > > > > http://www.linuxatemyram.com/ > > > > And if your devs don't believe have them try for > themselves using: > > > > http://www.linuxatemyram.com/play.html > > > > --kyleo > > > > On Thu, 23 Sep 2010 13:03:55 -0700 (PDT), Srija > > <[email protected]> > wrote: > >> Hi , > >> > >> In one of your xen guest ,one application is > running and is consuming > >> much memory, > >> so almost every alternate day they ask to reboot > the server. > >> > >> One of our admin suggested to use the following > command. > >> > >> free && sync && echo 3 > > /proc/sys/vm/drop_caches && free > >> > >> I was googling and there are mixed comments. Some > are advising it is > >> good , some are not. > >> > >> I was thinking that rather applying 'echo 3' , may > be 'echo 1' will be > >> good. > >> > >> As, > >> > >> To free pagecache: > >> > >> * echo 1 > /proc/sys/vm/drop_caches > >> > >> To free dentries and inodes: > >> > >> * echo 2 > /proc/sys/vm/drop_caches > >> > >> To free pagecache, dentries and inodes: > >> > >> * echo 3 > /proc/sys/vm/drop_caches > >> > >> Any advice will be really appreciated. Also do you > think when we will > >> execute the command, before that the application > is needed to be > >> stopped. > >> > >> Thanks in advance. > > > > _______________________________________________ > > rhelv5-list mailing list > > [email protected] > > https://www.redhat.com/mailman/listinfo/rhelv5-list > > > > _______________________________________________ > rhelv5-list mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/rhelv5-list > > _______________________________________________ > rhelv5-list mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/rhelv5-list > _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list
