Re: [OMPI users] Limit to number of processes on one node?

Ralph Castain wrote: > On Mar 4, 2010, at 7:51 AM, Prentice Bisbal wrote: > >> >> Ralph Castain wrote: >>> On Mar 4, 2010, at 7:27 AM, Prentice Bisbal wrote: >>> Ralph Castain wrote: > On Mar 3, 2010, at 12:16 PM, Prentice Bisbal wrote: > >> Eugene Loh wrote: >>> Prentice Bi

Re: [OMPI users] Option to use only 7 cores out of 8 on each node

"Addepalli, Srirangam V" writes: > It works after creating a new pe and even from the command prompt with > out using SGE. You shouldn't need anything special -- I don't. (It's common to run, say, one process per core for benchmarking.) Running mpirun -tag-output -np 14 -npernode 7 hostname

Re: [OMPI users] MPI_Init() and MPI_Init_thread()

On Mar 4, 2010, at 10:52 AM, Anthony Chan wrote: - "Yuanyuan ZHANG" wrote: For an OpenMP/MPI hybrid program, if I only want to make MPI calls using the main thread, ie., only in between parallel sections, can I just use SINGLE or MPI_Init? If your MPI calls is NOT within OpenMP direc

Re: [OMPI users] MPI_Init() and MPI_Init_thread()

- "Yuanyuan ZHANG" wrote: > For an OpenMP/MPI hybrid program, if I only want to make MPI calls > using the main thread, ie., only in between parallel sections, can I just > use SINGLE or MPI_Init? If your MPI calls is NOT within OpenMP directives, MPI does not even know you are using thre

Re: [OMPI users] MPI_Init() and MPI_Init_thread()

On Mar 4, 2010, at 7:36 AM, Richard Treumann wrote: A call to MPI_Init allows the MPI library to return any level of thread support it chooses. This is correct, insofar as the MPI implementation can always choose any level of thread support. This MPI 1.1 call does not let the application say

Re: [OMPI users] low efficiency when we use --am ft-enable-cr to checkpoint

There is some overhead involved when activating the current C/R functionality in Open MPI due to the wrapping of the internal point-to-point stack. The wrapper (CRCP framework) tracks the signature of each message (not the buffer, so constant time for any size MPI message) so that when we need t

Re: [OMPI users] checkpointing multi node and multi process applications

On Mar 4, 2010, at 8:17 AM, Fernando Lemos wrote: > On Wed, Mar 3, 2010 at 10:24 PM, Fernando Lemos wrote: > >> Is there anything I can do to provide more information about this bug? >> E.g. try to compile the code in the SVN trunk? I also have kept the >> snapshots intact, I can tar them up an

Re: [OMPI users] noob warning - problems testing MPI_Comm_spawn

Thanks Shiqing. I'll checkout a trunk copy and try that. Damien On 04/03/2010 7:29 AM, Shiqing Fan wrote: Hi Damien, Sorry for late reply, I was trying to dig inside the code and got some information. First of all, in your example, it's not correct to define the MPI_Info as an pointer, i

Re: [OMPI users] MPI_Init() and MPI_Init_thread()

A call to MPI_Init allows the MPI library to return any level of thread support it chooses. This MPI 1.1 call does not let the application say what it wants and does not let the implementation reply with what it can guarantee. If you are using only one MPI implementation and your code will never

Re: [OMPI users] Limit to number of processes on one node?

On Mar 4, 2010, at 7:51 AM, Prentice Bisbal wrote: > > > Ralph Castain wrote: >> On Mar 4, 2010, at 7:27 AM, Prentice Bisbal wrote: >> >>> >>> Ralph Castain wrote: On Mar 3, 2010, at 12:16 PM, Prentice Bisbal wrote: > Eugene Loh wrote: >> Prentice Bisbal wrote: >>> Euge

Re: [OMPI users] Limit to number of processes on one node?

Ralph Castain wrote: > On Mar 4, 2010, at 7:27 AM, Prentice Bisbal wrote: > >> >> Ralph Castain wrote: >>> On Mar 3, 2010, at 12:16 PM, Prentice Bisbal wrote: >>> Eugene Loh wrote: > Prentice Bisbal wrote: >> Eugene Loh wrote: >> >>> Prentice Bisbal wrote: >>> I

Re: [OMPI users] Limit to number of processes on one node?

On Mar 4, 2010, at 7:27 AM, Prentice Bisbal wrote: > > > Ralph Castain wrote: >> On Mar 3, 2010, at 12:16 PM, Prentice Bisbal wrote: >> >>> Eugene Loh wrote: Prentice Bisbal wrote: > Eugene Loh wrote: > >> Prentice Bisbal wrote: >> >>> Is there a limit on how many MP

Re: [OMPI users] MPI_Init() and MPI_Init_thread()

On Thursday 04 March 2010 01:32:39 Yuanyuan ZHANG wrote: > Hi guys, > > Thanks for your help, but unfortunately I am still not clear. > > > You are right Dave, FUNNELED allows the application to have multiple > > threads but only the man thread calls MPI. > > My understanding is that even if I u

Re: [OMPI users] noob warning - problems testing MPI_Comm_spawn

Hi Damien, Sorry for late reply, I was trying to dig inside the code and got some information. First of all, in your example, it's not correct to define the MPI_Info as an pointer, it will cause the initialization violation at run time. The message "LOCAL DAEMON SPAWN IS CURRENTLY UNSUPPORT

Re: [OMPI users] Limit to number of processes on one node?

Ralph Castain wrote: > On Mar 3, 2010, at 12:16 PM, Prentice Bisbal wrote: > >> Eugene Loh wrote: >>> Prentice Bisbal wrote: Eugene Loh wrote: > Prentice Bisbal wrote: > >> Is there a limit on how many MPI processes can run on a single host? >> >>> Depending on which OM

Re: [OMPI users] Segmentation fault when Send/Recv on heterogeneouscluster (32/64 bit machines)

Hi, I have some new discovery about this problem : It seems that the array size sendable from a 32bit to 64bit machines is proportional to the parameter "btl_tcp_eager_limit" When I set it to 200 000 000 (2e08 bytes, about 190MB), I can send an array up to 2e07 double (152MB). I didn't found muc

Re: [OMPI users] checkpointing multi node and multi process applications

On Wed, Mar 3, 2010 at 10:24 PM, Fernando Lemos wrote: > Is there anything I can do to provide more information about this bug? > E.g. try to compile the code in the SVN trunk? I also have kept the > snapshots intact, I can tar them up and upload them somewhere in case > you guys need it. I can a