> -----Original Message----- > From: linux-cluster-bounces@xxxxxxxxxx > [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of Matt Mitchell > Sent: Thursday, October 28, 2004 3:16 PM > To: David Teigland > Cc: linux-cluster@xxxxxxxxxx > Subject: Re: [Linux-cluster] clvmd without GFS? > > 7) Ugh. OK, let's try it on the other node: > > greenville:/mnt/xs_media# time sh -c 'ls > 100032/mls/fmls_stills | wc -l' > 298407 > > real 77m38.569s > user 0m8.850s > sys 0m35.006s > > > Both systems are sitting there idle now. What did I do by > unmounting and remounting the GFS partition? > > For the record that is just over 12GB of data in those 298407 files. > Partition is 3% full (as reported by df). > > Help...? I'd be curious to know if it makes a difference if you mount using -o noatime option (see man mount)? The default access-time update threshold for GFS is 3600 seconds (1 hour). This can cause a bunch of write transactions to happen, even if you're just doing a read operation such as ls. Since your exercise is taking over an hour, this might be thrashing the atime updates, but I don't know how much that might be adding. -- Ben -- Opinions are mine, not Intel's > > -m > > -- > > Linux-cluster@xxxxxxxxxx > http://www.redhat.com/mailman/listinfo/linux-cluster >
