Re: [perf-discuss] how to measure the whole IO path?

2007-08-02 Thread Roch - PAE
Sean Liu writes: > Hi Jim, > > Thanks for your reply, and that's good information. > I actually did most of what you suggested. > I started with dtrace and seems every system call takes longer to run > on the filesystem when it is shared than not. So that's why I needed > to understand what

Re: [perf-discuss] how to measure the whole IO path?

2007-08-03 Thread Roch - PAE
J. Bruce Fields writes: > On Fri, Aug 03, 2007 at 11:13:41AM +0200, Roch - PAE wrote: > > Not a NFS expert but I would think giving a directory > > delegation to a client doing the tar x would allow the > > server to optimise this type of load; greatly. > &g

Re: [perf-discuss] how to measure the whole IO path?

2007-08-03 Thread Roch - PAE
Keith Bierman writes: > > On Aug 2, 2007, at 3:55 PM, J. Bruce Fields wrote: > > > On Thu, Aug 02, 2007 at 03:50:19PM -0600, Keith Bierman wrote: > >> Posit suitable battery backed up or nonvolatile cache. It would take > >> collusion (thus consent ;>) of both the client and server; > >

Re: [perf-discuss] Poor swap performance

2007-08-20 Thread Roch - PAE
Peter C. Norton writes: > On Wed, Aug 15, 2007 at 04:57:05PM -0700, adrian cockcroft wrote: > > How fast do disks turn? You get one page per revolution. Adding more swap > > disks would only help if there was more than one thread trying to read the > > data. Ultra 1 had a nice fast 7200rpm SCS

Re: [perf-discuss] Poor swap performance

2007-08-21 Thread Roch - PAE
adrian cockcroft writes: > I think this is a good forum to discuss a systematic performance issue with > swap. The problem has been there for a long time, I tried to get people > interested in doing something about it around ten years ago, I left Sun in > 2004 and don't even use Sun's at my c

Re: [perf-discuss] Poor swap performance

2007-08-21 Thread Roch - PAE
adrian cockcroft writes: > Why can't you adapt ZFS for swap? It does the transactional clustering of > random writes into sequential related blocks, aggressive prefetch on read, > and would also guard against corrupt blocks in swap. Anon-ZFS? > Adrian Good point. And It works already, swap to

Re: [perf-discuss] Poor swap performance

2007-08-22 Thread Roch - PAE
Peter C. Norton writes: > On Tue, Aug 21, 2007 at 05:34:38PM +0200, Roch - PAE wrote: > > > > adrian cockcroft writes: > > > Why can't you adapt ZFS for swap? It does the transactional clustering > > of > > > random writes into seque

Re: [perf-discuss] (fwd) Re: Project proposal: CPUfs (fwd)

2007-09-20 Thread Roch - PAE
Bill Sommerfeld writes: > On Fri, 2007-09-14 at 13:06 -0700, Alexander Kolbasov wrote: > > Just being Devil's advocate. I don't doubt that you should be able to > > improve the measurement significantly. I just think that the notion of > > CPU utilization is a vague and processor dependent c