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983 y(to)e(allo)o(w)i(for)e(a)h(bu\013er)g(with)h(more)f(than)g(2)g(Gb)
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V 17 w(FN)h(when)g(used)89 1227 y(with)e(MPI)p 282 1227
V 16 w(KEYV)-5 b(AL)p 489 1227 V 17 w(CREA)l(TE.)13 b(In)g(particular,)
h(when)f(describing)h(the)f("cop)o(y)p 1516 1227 V 16
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V 16 w(NULL)p 421 1321 V 17 w(FN)i(is)h(a)f(function)h(that)e(do)q(es)i
(nothing)g(other)e(than)i(returning)f(\015ag)g(=)h(0.)89
1415 y(This)f(is)g(inconsisten)o(t)h(with)f(a)g(n)o(ull)h(function)f
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(nothing\))89 1471 y(and)g(will)i(fail)f(when)g(used)f(as)g(the)h
("delete)p 838 1471 V 17 w(function",)f(where)h(w)o(e)f(sa)o(y)189
1565 y(It)g(ma)o(y)f(b)q(e)i(sp)q(eci\014ed)h(as)e(the)g(n)o(ull)h
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1442 1565 V 17 w(NULL)p 1583 1565 V 17 w(FN)h(from)189
1622 y(either)h(C)f(or)f(F)o(OR)l(TRAN,)i(in)g(whic)o(h)g(case)f(no)g
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1715 y(There)g(are)g(t)o(w)o(o)f(ob)o(vious)h(\014xes:)20
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1715 V 17 w(FN)e(with)h(MPI)p 1413 1715 V 16 w(NULL)p
1553 1715 V 17 w(COPY)p 1703 1715 V 17 w(FN)f(\(for)89
1772 y(correctness\))9 b(and)i(MPI)p 510 1772 V 16 w(NULL)p
650 1772 V 18 w(DELETE)p 857 1772 V 16 w(FN)e(\(for)h(consistency\))g
(in)h(the)g(discussion)h(of)d(MPI)p 1745 1772 V 17 w(KEYV)-5
b(AL)p 1953 1772 V 17 w(CREA)l(TE.)89 1828 y(2\))14 b(Change)h(the)h(w)
o(ording)f(under)h("cop)o(y)p 806 1828 V 16 w(function")f(to)189
1922 y(MPI)p 281 1922 V 16 w(NULL)p 421 1922 V 17 w(FN)e(is)h(a)e
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(\(naturally\))f(mak)o(es)h(the)f(imple-)89 2185 y(men)o(tation)f
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(this)g(violates)113 2580 y(*)g(the)h(prototype)e(differences)h(in)g
(usage)h(for)f(copy)g(and)h(delete)f(function)910 2719
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(related)g(P)l(A)o(CK)g(calls,)i(and)f(sen)o(t)e(with)i(t)o(yp)q(e)189
1186 y(MPI)p 281 1186 V 16 w(P)l(A)o(CKED)15 b(is)h(iden)o(tical)h(to)d
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1279 y(I)f(don't)g(understand)h(wh)o(y)e(y)o(ou)h(came)g(to)g(the)g
(conclusion)i(it)e(is)h(wrong)e(to)h(send)h(the)f(concatenation)89
1336 y(of)f(sev)o(eral)i(pac)o(king)g(units)f(with)h(t)o(yp)q(e)f(MPI)p
868 1336 V 17 w(P)l(A)o(CKED.)89 1411 y(\(end)g(of)g(Marc\).)k(Where)c
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1505 V 16 w(BOTTOM)15 b(in)i(F)l(ortran.)89 1580 y(There)k(is)h(a)f
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(of)e(MPI)p 1385 1580 V 16 w(BOTTOM)h(for)e(F)l(ortran.)89
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b(v)m(alues)g(are)f(passed)h(b)o(y)f(reference.)20 b(No)o(w)15
b(consider)h(the)f(follo)o(wing)h(t)o(w)o(o)e(co)q(de)i(fragmen)o(ts:)
89 1862 y Fa(C:)89 1918 y(void)23 b(*p;)89 2031 y(p)g(=)h(\(void)f
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2213 y(Fortran:)89 2269 y(integer)g(p)89 2382 y(p)g(=)h(MPI_BOTTOM;)89
2438 y(MPI_Send\()e(p,)i(...)f(\);)89 2563 y Ff(The)15
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(\014nd)h(whether)f(t)o(w)o(o)f(no)q(des)i(use)89 532
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589 y(mind,)k(for)f(P)o(armacs)g(em)o(ulation.)27 b(More)17
b(generally)l(,)i(users)e(ma)o(y)g(w)o(an)o(t)g(enquiry)h(functions)g
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890 y(data)g(represen)o(tations)g(\(size)h(of)f(eac)o(h)h(basic)g
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(are)89 1247 y(asso)q(ciated)h(with)h(MPI)p 501 1247
V 16 w(COMM)p 669 1247 V 16 w(W)o(ORLD.)f(I)h(w)o(ould)f(suggest)g(the)
g(follo)o(wing:)89 1322 y(Asso)q(ciate)f(a)f(prede\014ned)i(attribute)f
(k)o(ey)f(MPI)p 907 1322 V 17 w(PR)o(OC)p 1055 1322 V
16 w(TYPE)h(with)g(MPI)p 1405 1322 V 16 w(COMM)p 1573
1322 V 16 w(W)o(ORLD.)g(The)89 1379 y(v)m(alue)k(of)f(this)g(attribute)
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b(meaning)g(of)g(the)f(v)m(alues)i(of)e(this)i(attribute)e(is)h(imple-)
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(these)f(pro)q(cesses\).)89 1623 y(Implemen)o(ters)e(of)f(MPI)g(for)g
(homogeneous)g(SPMD)g(systems)g(just)g(need)h(to)f(alw)o(a)o(ys)g
(return)g(the)g(same)89 1680 y(v)m(alue)17 b(\(0?\))k(with)15
b(this)i(attribute.)j(Implemen)o(ters)d(of)e(MPI)h(on)f(heterogeneous)h
(systems)f(ma)o(y)g(need)89 1736 y(some)g(w)o(ork.)89
1811 y(If)k(this)h(suggestion)f(sounds)h(reasonable,)g(then)f(the)h(v)m
(arious)f(MPI)g(implemen)o(ters)i(ma)o(y)d(accept)i(it)89
1868 y(no)o(w)14 b(as)h("common)g(practice",)g(and)g(w)o(e)g(can,)g(at)
g(a)g(latter)g(time,)g(add)g(this)h(to)e(the)i(standard.)910
2719 y(7)p eop
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end
userdict /end-hook known{end-hook}if
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