cdvmPDe (1158403), страница 3

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if(rg==0) rg=crtrg_(1,1);

(void)rvs;

Macro DVM_REDUCTION(loopid,rvs) is expanded to

{ RedGroupRef DVM_RG;

LoopRef DVM_LP0=0;

PSSpaceRef DVM_PSSpace=DVM_LP##loopid;

DVM_RG=crtrg_(1, 1);

(void)rvs;

DVM_INSERT_RV();

Macro DVM_REDUCTION20(loopid, rg) is expanded to

{ RedGroupRef DVM_RG=rg;

LoopRef DVM_LP0=0;

PSSpaceRef DVM_PSSpace=DVM_LP##loopid;

DVM_INSERT_RV();

rg=DVM_RG;}

Macro DVM_INSERT_RV() is expanded to

while(CDVM_TOP!=CDVM_BOTTOM) {

insred_( &DVM_RG, (RedRef*)CDVM_TOP, &DVM_PSSpace, 1);

}

Macro DVM_END_REDUCTION() is expanded to

{strtrd_(&DVM_RG);

waitrd_(&DVM_RG);

delrg_(&DVM_RG);}

}

3.5.3Reduction variables and operations

Context and syntax.

DVM(...; REDUCTION ... MAX(red-var) ... )

DVM(...; REDUCTION ... MIN(red-var) ... )

DVM(...; REDUCTION ... SUM(red-var) ... )

DVM(...; REDUCTION ... PROD(red-var) ... )

DVM(...; REDUCTION ... AND(red-var) ... )

DVM(...; REDUCTION ... OR(red-var) ... )

DVM(...; REDUCTION ... MAXLOC(red-var,loc-var) ... )

DVM(...; REDUCTION ... MINLOC(red-var,loc-var) ... )

Proposed compiler output.

DVM_RVAR(rf_MAX,var,t,l)

DVM_RVAR(rf_MIN,var,t,l)

DVM_RVAR(rf_SUM,var,t,l)

DVM_RVAR(rf_PROD,var,t,l)

DVM_RVAR(rf_AND,var,t,l)

DVM_RVAR(rf_OR,var,t,l)

DVM_RLOC(rf_MAX,var,t,l,loc-var)

DVM_RLOC(rf_MIN,var,t,l,loc-var)

Note. The parameter t is a code of type of variable (rt_INT, rt_LONG, rt_FLOAT, rt_DOUBLE). Parameter l is the number of elements in red-var (if it is an array) or 1. Macro DVM_RVAR(f,v,t,l) is expanded to

crtred_(f, &(v), t, l, 0, 0, 1)

Macro DVM_RLOC(f,v,t,l,loc) is expanded to

crtred_(f, &(v), t, l, &(loc), sizeof(loc), 1)

3.5.4REDUCTION_START directive

Context and syntax.

DVM(REDUCTION_START red-group-id);

Proposed compiler output.

DVM_REDUCTION_START(red-group-id);

Note. The executable directive is converted to a statement. Macro DVM_REDUCTION_START(rg) is expanded to

strtrd_((RedGroupRef*) &rg)

3.5.5REDUCTION_WAIT directive

Context and syntax.

DVM(REDUCTION_WAIT red-group-id);

Proposed compiler output.

DVM_REDUCTION_WAIT(red-group-id);

Note. The executable directive is converted to a statement. Macro DVM_REDUCTION_WAIT(rg) is expanded to

waitrd_((RedGroupRef*) &rg);

delrg_((RedGroupRef*) &rg);

rg=0;

3.6Implicit constructions

3.6.1Creation and deletion of distributed arrays

Context and syntax.

array = malloc(dim₁ *...* dim_r * elem-size);

free( array );

Proposed compiler output. It includes all or part of the following statements depending on array declaration.

[ DVM_CREATE_TEMPLATE(am,t,r,di); // implicit template ]

[ DVM_ONTO(ps,k,ls,hs); // target system ]

[ DVM_DISTRIBUTE(amv,ps,k,axs); // distribute template ]

[ DVM_GENBLOCK(am,ps,k,gbs); // GENBLOCK parameters ]

DVM_MALLOC(arr,r,len,dim,lw,hw,redis) // initialize array handler

[ DVM_ALIGN(arr,base,k,i,a,b) // align with template ]

Note. Macro Macro DVM_MALLOC(arr,r,len,dim,lw,hw,redis) is expanded to

{crtda_( arr, 0, NULL, r, len, dim, 0, redis, lw, hw );

}

Macro DVM_ALIGN(arr,base,k,i,a,b) is expanded to

{align_( arr, &(base), i, a, b);

}

Macro DVM_FREE(arr) is expanded to

(delda_(arr));

3.6.2Static distributed arrays

Context and syntax.

DVM(DISTRIBUTE | ALIGN...)

element-type array-id "["const-dim"]"...;

Proposed compiler output. Standard array creation sequence as for malloc.

Note. For global declarations implicit malloc is inserted at the beginning of the main function. For local declarations it is inserted before the first statement of the block.

3.6.3References to distributed data

Context and syntax. Ordinary references to array elements array[ind₁]...[ind_r] with distributed array. Special form array(ind₁,...,ind_r) is allowed for macro simulation of dynamic arrays.

Proposed compiler output.

DAElm<r>(type,array-id,ind₁,...ind_r)

Note. These are macros of RTL.

3.6.4Own computation references

Context and syntax. references

lhs=rhs; // assignment

Proposed compiler output.

if(DVM_ISLOCAL(lhs)) {

lhs = rhs ; }

DVM_ENDLOCAL();

Note. Own computation statement is an assignment to a distributed array in a non distributed branch of program. It should be guarded by the test of locality. Macro DVM_ISLOCAL(a,r,ind) is expanded to

tstelm_(a, ind)

Macro DVM_ENDLOCAL() is expanded to

dskpbl_()

3.6.5Initializing and finalizing of program execution

Context and syntax.

int main( int argc, char ** arg)

{

declarations...

first-statement

...

[ exit(rc); ]

...

return rc;

}

Proposed compiler output.

int main( int argn, char ** args)

{

declarations...

DVM_INIT(0,argn,args); // initialization of RTL

[ implicit static array creation ]

[ tracing of initialized variables ]

[ other implicit actions ]

first-statement

...

[ DVM_EXIT(rc); ] // exit through RTL

...

DVM_RETURN(rc); // exit through RTL

}

Note. For correct generation the main function must get a command-line parameters (which will be passed to RTL) and must have return or exit statement. Macro DVM_INIT(argn,args) is expanded to

{rtl_init(0L,argn,args);

}

Macro DVM_RETURN(r) is expanded to

{lexit_(r);}

Macro DVM_EXIT(r) is expanded to

{lexit_(r);}

3.6.6Input-output functions

Compilation of input-output functions is reduced to renaming of iofun to its RTL analog dvm_iofun. The only exception is fread() and fwrite() functions, when they are applied to a distributed array. In this case the array is read or written as a whole, i.e. size parameter of the function is ignored.

3.7Debugging extensions

3.7.1Performance analyzer. Loops

Context and syntax.

[ DVM(PARALLEL... ) ]

DO(var,first,last,step) // or

FOR(var,times)

loop-body

Proposed compiler output.

BPLOOP(n) // for parallel loop or

BSLOOP(n) // for sequential loop

code for loop

ELOOP(n)

Note. The argument n is a serial number of the loop used to identify paired commands. The set of loops for which the macros are generated depends on a command-line options (-e1...-e4). Macro DVM_BPLOOP(n) is expanded to

bploop_(n);

Macro DVM_BSLOOP(n) is expanded to

bsloop_(n);

Macro DVM_ELOOP(n) is expanded to

eloop_(n, line);

3.7.2Performance analyzer. INTERVAL directive

Context and syntax.

DVM(INTERVAL [ int-expr ] )

{ C-statements }

Proposed compiler output.

DVM_BINTER(n,v)

{ code for statements }

DVM_EINTER(n)

Note. The argument n is a serial number of the loop used to identify paired commands. If int-expr does not present, the argument v has some standard value. Macro DVM_BINTER(n,v) is expanded to

binter_(n, v)

Macro DVM_EINTER(n) is expanded to

einter_(n,line )

3.7.3Debugger. Data tracing

Context and syntax. Any reference to ordinary or distributed variable var in C-statements or variable initialization.

Proposed compiler output.

DVM_STVA(type,rt,var,base,rhs) // lh-side of assignment

DVM_LDV(type,rt,var,base) // for read access

DVM_STV(type,rt,var,base) // to register initialization

Note. The set of references, the macros are generated for, depends on a command-line options (-d1...-d4). Macro DVM_LDV(type,rt,var,base) is expanded to

*(type*) ( ( DVM2A((long)&(var),rt) &&

dldv_(&CDVM_TOP[1],

(AddrType *)&CDVM_TOP[0],

(long *) base, #var, -1) && 0) ? 0 :

)

Macro DVM_STV(type,rt,var,base) is expanded to

( DVM2A((long)&(var), rt),

dprstv_(&CDVM_TOP[1], (AddrType *)&CDVM_TOP[0],

(long *) base, #var, -1),

dstv_())

Macro DVM_STVA(type,rt,var,base,rhs) is expanded to

( DVM2A((long)&(var), rt),

dprstv_(&CDVM_TOP[1], (AddrType *)&CDVM_TOP[0],

(long *) base, #var, -1),

(*(type *)(CDVM_TOP[0]) = rhs),

dstv_())

Such an awful construction arised as a result of porting to MS Visual-C 5.0. -- Unusual order of calculation of comma-expression.

3.7.4Debugger. Computation tracing

Context and syntax. Any loop or task region construct.

Proposed compiler output.

parallel loop creation

DVM_PLOOP(n,r,ls,hs,ss) // or DVM_SLOOP(n)

loop-headers

DVM_ITER(r,vars)

code for loop body

DVM_ENDLOOP(n)

for loop or

DVM_BTASK(n) // in TASK_REGION header

...

DVM_ETASK(n)

ON-block or ON-loop body

...

DVM_NTASK(ind) // end of TASK_REGION construct

for task region.

Note. Macro DVM_PLOOP(n,r,ls,hs,ss) is expanded to

dbegpl_(r, n, ls, hs, ss);

Parameters are the same as for loop creation. Macro DVM_SLOOP(n) is expanded to

dbegsl_(n);

Macro DVM_ENDLOOP(n) is expanded to

dendl_(n, line);

Macro DVM_ITER(r,vars) is expanded to

diter_(vars, NULL );

Macro DVM_BTASK(n) is expanded to

dbegtr_(n);

Macro DVM_ETASK(n) is expanded to

dendl_(n, );

Macro DVM_NTASK(ind) is expanded to

diter_(ind, 0);

3.7.5Sequential code

Generation of sequential code is set by the command-line option -s. All DVM-directives ignored except for the following:

• parallel loops and tasks;

• reduction groups have to be created for the tracer work properly;

• distribution directives are used to distinguish ordinarily from distributed data for selective tracing.

Note that preprocessor statements #define should be kept in place unlike the parallel code from which they moved to the beginning if the file.

Характеристики

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