Re: [Beowulf] max number of NFS threads: NFS config optimization

2008-12-18 Thread Alex Chekholko
On Thu, 18 Dec 2008 13:59:06 -0600 "Rahul Nabar" wrote: > For a while I've been seeing errors of this sort in my /var/log/messages > > kernel: nfsd: too many open TCP sockets, consider increasing the number of > nfsd threads > > I googled a bunch and think the solution might be to boost RPCNFSD

Re: [Beowulf] max number of NFS threads: NFS config optimization

2008-12-18 Thread Rahul Nabar
On Thu, Dec 18, 2008 at 2:46 PM, John Hearns wrote: > This depends on your distribution. > On SuSE Linux, look in /etc/sysconfig/nfs Found it. Its the same file on Fedora, my distro. > > I used to set the number of NFS kernel threads to the number of clients when > building a cluster. This is v

Re: [Beowulf] max number of NFS threads: NFS config optimization

2008-12-18 Thread Rahul Nabar
On Thu, Dec 18, 2008 at 3:02 PM, Alex Chekholko wrote: > > Up it to 32, see if you keep getting the message? :) Okie! Thanks Alex! I'm going to try 32 now. > > Also check that you're actually running just 8: > ps auxf|grep nfs Just checked that. Yes. It is truely 8. -- Rahul _

Re: [Beowulf] Book recomendations for cluster programing

2008-12-18 Thread Chris Samuel
- "Gus Correa" wrote: > GPU programming lacks a common standard API, Hopefully OpenCL will help address this! -- Christopher Samuel - (03) 9925 4751 - Systems Manager The Victorian Partnership for Advanced Computing P.O. Box 201, Carlton South, VIC 3053, Australia VPAC is a not-for-prof

Re: [Beowulf] max number of NFS threads: NFS config optimization

2008-12-18 Thread Chris Samuel
- "Rahul Nabar" wrote: > For a while I've been seeing errors of this sort in my > /var/log/messages Are you using ext3 for that filesystem by some chance ? We long ago switched from RHEL to to Debian for our NFS servers so we could use XFS rather than ext3 as ext3 just couldn't keep up wit

Re: [Beowulf] max number of NFS threads: NFS config optimization

2008-12-18 Thread John Hearns
2008/12/18 Rahul Nabar > For a while I've been seeing errors of this sort in my /var/log/messages > > > > Question: This seems a suspicious place to change it. Isn't there a nfs > config file somewhere else? > This depends on your distribution. On SuSE Linux, look in /etc/sysconfig/nfs I used

[Beowulf] max number of NFS threads: NFS config optimization

2008-12-18 Thread Rahul Nabar
For a while I've been seeing errors of this sort in my /var/log/messages kernel: nfsd: too many open TCP sockets, consider increasing the number of nfsd threads I googled a bunch and think the solution might be to boost RPCNFSDCOUNT in the line "[ -z "$RPCNFSDCOUNT" ] && RPCNFSDCOUNT=8" in the f

Re: [Beowulf] Book recomendations for cluster programing

2008-12-18 Thread Gus Correa
Prentice Bisbal wrote: Micha Feigin wrote: I'm trying to learn cluster/parallel programing properly. I've got some information on MPI, although I'm not sure if it's the best books. I was wondering if you have some book recommendations regarding the more specialized things, especially the cpu

Re: [Beowulf] Book recomendations for cluster programing

2008-12-18 Thread Prentice Bisbal
Micha Feigin wrote: > I'm trying to learn cluster/parallel programing properly. I've got some > information on MPI, although I'm not sure if it's the best books. I was > wondering if you have some book recommendations regarding the more specialized > things, especially the cpu vs gpu paralelization

[Beowulf] Book recomendations for cluster programing

2008-12-18 Thread Micha Feigin
I'm trying to learn cluster/parallel programing properly. I've got some information on MPI, although I'm not sure if it's the best books. I was wondering if you have some book recommendations regarding the more specialized things, especially the cpu vs gpu paralelization issue (or as far as I under

Re: [Beowulf] SSD prices - q: how many writes/erases???

2008-12-18 Thread Joe Landman
Lux, James P wrote: I can't find the Intel P/E cycle, but the Ridata units are 2x10^6 (2E+6). Is that the underlying device wearout life, or is it the apparent life at the "integrated unit"'s external interface. For instance, if they had a The latter I believe, as consumers (the mass marke

[Beowulf] Sporthall 500 considerations

2008-12-18 Thread Vincent Diepeveen
Heh Chris, Thanks for dropping a line. Heh, on your own department i happen to see that in systems support you've got a collegue Andrew Underwood. Would you mind asking him whether he's family from Paul Underwood, with 3 persons (Tony Reix, Paul and me says the fool) we're searching for Wag

Re: [Beowulf] SSD prices - q: how many writes/erases???

2008-12-18 Thread Lux, James P
>> >> If they are cherry picked, then it's not really a turning point >> in SSDs. It also bothers me that a normal production run can >> have parts with rewrites at 100K and 1M. Sounds like there >> are some variabilities that can't be controlled. > > Similar things happen with RAM. And in CPUs

Re: [Beowulf] SSD prices - q: how many writes/erases???

2008-12-18 Thread Joe Landman
Jeff Layton wrote: Nifty Tom Mitchell wrote: On Fri, Dec 12, 2008 at 04:35:26PM +0100, Peter Jakobi wrote: Sun and Micron recently reported a million plus cycles for a single level flash product. Current shipping product is on the order of 10 cycles. From what I understand these w

Re: [Beowulf] SSD prices - q: how many writes/erases???

2008-12-18 Thread Jeff Layton
Nifty Tom Mitchell wrote: On Fri, Dec 12, 2008 at 04:35:26PM +0100, Peter Jakobi wrote: Sun and Micron recently reported a million plus cycles for a single level flash product. Current shipping product is on the order of 10 cycles. From what I understand these were cherry picked pa

Re: [Beowulf] Newbie Question: Racks versus boxes and good rack solutions for commodity hardware

2008-12-18 Thread John Hearns
2008/12/16 Vincent Diepeveen > > That's what we did do (not in cuda, simply at the pc). > A single core P4 can render a second or 10 of animations of an entire scene > within a few minutes. > That's a 3d engine in C/C++ code, not even using SSE2 assembler. > > Where do you get these figures from?