Sorry,
But you should read
void Create_MPI_CLIENT_STATS(MPI::Datatype& newtype)
{
// build datatype
MPI::Datatype type[2] = { MPI::DOUBLE, MPI::UNSIGNED_LONG_LONG }
;
int blocklen[2] = { 7, 2 } ;
MPI::Aint disp[9] ;
...
Instead of
void Create_MPI_CLIENT_STATS(MPI::Datatype& newtype)
{
// build datatype
MPI::Datatype type[2] = { MPI::DOUBLE, MPI::DOUBLE } ;
On Tue, 2004-03-30 at 19:27, Evadream wrote:
> Hello everybody,
>
> I spent a few hours on a little problem about sending structure. I'v got
> no problem with contiguous data, like this one :
>
> typedef struct ComputeInfo {
> unsigned long long line_number ;
> unsigned long long total_charge ;
> } ;
>
> which i commit with this few lines :
>
> void Create_MPI_ULONG_LONG_PAIR(MPI::Datatype& newtype)
> {
> newtype = MPI::UNSIGNED_LONG_LONG.Create_contiguous(2) ;
> newtype.Commit() ;
> }
>
> Now, i try to build up a MPI::Datatype based on heterogenous data. Take
> this one :
>
> typedef struct ClientStats {
> double network_wait_time ;
> double network_send_time ;
> double compute_time ;
> double start_delay ;
> double total_time ;
> double mhz ;
> double bogomips ;
> unsigned long long line_number ;
> unsigned long long total_charge ;
> } ;
>
> This is the code i wrote to commit this new type :
>
> void Create_MPI_CLIENT_STATS(MPI::Datatype& newtype)
> {
> // build datatype
>
> MPI::Datatype type[2] = { MPI::DOUBLE, MPI::DOUBLE } ;
> int blocklen[2] = { 7, 2 } ;
> MPI::Aint disp[9] ;
>
> ClientStats stat ;
>
> disp[0] = MPI::Get_address(&stat.network_wait_time) ;
> disp[1] = MPI::Get_address(&stat.network_send_time) ;
> disp[2] = MPI::Get_address(&stat.compute_time) ;
> disp[3] = MPI::Get_address(&stat.start_delay) ;
> disp[4] = MPI::Get_address(&stat.total_time) ;
> disp[5] = MPI::Get_address(&stat.mhz) ;
> disp[6] = MPI::Get_address(&stat.bogomips) ;
> disp[7] = MPI::Get_address(&stat.line_number) ;
> disp[8] = MPI::Get_address(&stat.total_charge) ;
>
> for(int i = 8; i >= 0; i--) disp[i] -= disp[0] ;
>
> newtype = newtype.Create_struct(1, blocklen, disp, type) ;
> newtype.Commit();
> }
>
> It's compile fine without any warnings, but it works quite bad. Here is
> the way i use this new datatype :
>
> // SENDER
> ClientStats stat ;
> [...]
> MPI::COMM_WORLD.Send( &stat , 1, CLIENT_STATS, 0, TAG_STATS) ;
>
> // RECEPTION
> ClientStats stat ;
> MPI::COMM_WORLD.Recv(&stat, 1, CLIENT_STATS, worker, TAG_STATS, status)
> ;
>
> When i read my ClientStats structure, the unsigned long long
> line_number, unsigned long long total_charge variables are unchanged,
> although i send a new value.
>
> I'm quite newbie with MPI stuff, so i think i'm doing something wrong.
> It would be very nice if you can give me some advice about this problem
> !
>
> Thanx !
>
> _______________________________________________
> This list is archived at http://www.lam-mpi.org/MailArchives/lam/
>
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