cwk@boomer.ssc.gov (Carl W. Kalbfleisch) (06/19/91)
Based on the number of requests I am getting for copies of our
paper entitled "Overview of real-time kernels at the SSC
Laboratory", I have decide that there is enough interest to
post the Post Script file to this newsgroup.
Save the file, remove the text above and below the "cut here"
text and send it to your favorite Post Script printer. Enjoy!
Comments are welcome, everything else is not.
Carl W. Kalbfleisch
------------------------CUT HERE--------------------------
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20 36 -3 34 27] 83 @dc
[<
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32 34 -2 33 37] 72 @dc
[<
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32 35 -2 33 37] 85 @dc
[<
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27 34 -2 33 33] 80 @dc
[<
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28 36 -3 34 35] 67 @dc
[<
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31 34 -2 33 37] 68 @dc
[<
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32 36 -3 34 38] 71 @dc
[<
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29 34 -2 33 35] 66 @dc
[<
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34 34 -1 33 37] 89 @dc
@F4 @sf
[<
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28 28 -2 27 32] 75 @dc
/@F6 @newfont
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[<
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11 13 -2 13 17] 3 @dc
/@F0 @newfont
@F0 @sf
[<
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30 35 -3 34 36] 65 @dc
[<
1F0031C060E06070E038E038E03CE01EE01EE01E700F700F700F700F380F380738073C061E
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16 35 -5 34 22] 98 @dc
[<
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17 21 -3 20 20] 115 @dc
[<
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13 31 -4 30 16] 116 @dc
[<
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18 21 -5 20 21] 114 @dc
[<
0F0780308C40305C40703C20701C20F01C20F00E10F00E00F00E00F00E0078070078070078
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20 21 -5 20 25] 97 @dc
[<
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17 21 -5 20 22] 99 @dc
@F4 @sf
[<
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33 29 0 28 35] 14 @dc
[<
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13 12 -6 28 21] 92 @dc
[<
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13 12 -1 28 21] 34 @dc
/@F7 @newfont
@F7 @sf
[<
0C000C008C40EDC07F800C007F80EDC08C400C000C00>
10 11 -3 11 16] 3 @dc
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@F5 @sf
[<
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22 23 -2 22 27] 79 @dc
[<
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18 20 0 13 20] 112 @dc
[<
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13 14 -1 13 16] 101 @dc
[<
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13 14 0 13 14] 114 @dc
[<
1F1E70FFE079E039E039703830381E3803F800381038383038601FC0>
16 14 -1 13 18] 97 @dc
[<
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10 20 -1 19 14] 116 @dc
[<
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18 23 -1 22 20] 100 @dc
[<
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18 23 0 22 20] 98 @dc
[<
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16 20 -1 13 19] 121 @dc
[<
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19 23 0 22 20] 104 @dc
[<
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23 23 -1 22 26] 85 @dc
[<
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19 14 0 13 20] 110 @dc
[<
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8 23 0 22 10] 105 @dc
[<
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16 14 -1 13 19] 118 @dc
[<
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11 14 -1 13 14] 115 @dc
[<
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24 23 -1 22 26] 82 @dc
[<
07C01830300870086000E000E000E000E000600070103038183807F0>
13 14 -1 13 16] 99 @dc
[<
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23 23 -1 22 26] 65 @dc
[<
07C018303018701CE00EE00EE00EE00EE00E600C600C3018183007C0>
15 14 -1 13 18] 111 @dc
[<
40402020101070F0F060>
4 10 -3 3 10] 44 @dc
[<
FFE00E000E000E000E000E000E000E000E000E000E000E000E000E000E000E000E000E000E
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11 23 -1 22 13] 73 @dc
[<
60F0F060>
4 4 -3 3 10] 46 @dc
[<
FF801C001C001C001C001C001C001C001C001C001C001C001C00FF801C001C001C001C001C
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12 23 0 22 11] 102 @dc
[<
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15 23 -2 22 20] 83 @dc
[<
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23 23 -1 22 27] 68 @dc
[<
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29 14 0 13 29] 109 @dc
[<
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21 23 -1 22 24] 69 @dc
[<
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16 21 -1 13 18] 103 @dc
[<
03E7E00E17001C0F001C07001C07001C07001C07001C07001C07001C07001C07001C07001C
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19 14 0 13 20] 117 @dc
[<
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20 23 -2 22 25] 67 @dc
[<
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23 23 -1 22 26] 78 @dc
[<
FF80FF80>
9 2 0 7 12] 45 @dc
[<
07C01C703018701C600C600CE00EE00EE00EE00EE00EE00EE00EE00EE00E600C600C701C30
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15 21 -1 20 18] 48 @dc
[<
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13 21 -2 20 18] 50 @dc
[<
0FE03830600CC004C006C006C00E601E607C18F80FF00FC01F603E107818700C600C600C20
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15 21 -1 20 18] 56 @dc
[<
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15 21 -1 20 18] 57 @dc
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15 21 -1 20 18] 52 @dc
[<
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15 21 -1 20 18] 54 @dc
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[<
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15 28 -4 27 21] 49 @dc
[<
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27 30 -6 28 30] 67 @dc
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26 28 -7 27 30] 84 @dc
[<
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14 18 -3 17 17] 115 @dc
[<
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17 29 -3 28 19] 107 @dc
@F2 @sf
[<
80E00083F800C7F8007E0C0040060020020010020010010008000006000001000000C00000
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18 29 -4 27 21] 50 @dc
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26 28 -3 27 28] 80 @dc
[<
83E000CC1800F004006002006003006001806001802000C02000C00000C00000C00001C000
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22 30 -3 28 23] 83 @dc
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19 26 -1 17 21] 112 @dc
[<
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17 29 -5 28 21] 100 @dc
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26 29 -3 27 30] 82 @dc
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[<
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18 29 -4 27 21] 51 @dc
@F2 @sf
[<
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18 36 -2 27 21] 52 @dc
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17 29 -3 28 21] 104 @dc
@F2 @sf
[<
1F000021C000406000403000803800801800E01C00700C00700E00000E00000E0000060000
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19 29 -4 27 21] 53 @dc
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27 30 -6 28 32] 71 @dc
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[<
1E000021800060C000606000E07000E03800E03800E01C00E01C00E01C00601C00700E0070
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17 29 -5 27 21] 54 @dc
[<
804040201010080838783818>
5 12 -3 3 13] 44 @dc
[<
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25 29 -9 27 31] 85 @dc
1 @eop0
0 0 1 @bop1 419 17 a @F1 @sf(O)o(VER)-5 b(VI)o(EW)15 b(OF)h(REAL-TIME)h
(KERNELS)f(A)l(T)g(THE)-1224 58 y(SUPER)o(CONDUCTING)f(SUPER)h(COLLIDER)i
(LABORA)l(TOR)l(Y)-1286 133 y @F4 @sf(K.)13 b(Lo)o(w,)g(S.)h(Ac)o(hary)o
(a,)f(M.)h(Allen,)f(E.)g(F)m(augh)o(t,)g(D.)g(Haenni,)g(C.)h(Kalb\015eisc)o
(h)-781 49 y(SSC)g(Lab)q(oratory)14 -15 y @F6 @sf(\003)-385 65 y @F4 @sf
(2550)f(Bec)o(kleymeade)i(Av)o(e.)-403 50 y(Dalla)o(s,)e(T)m(exas)h(75237)
-1257 87 y @F0 @sf(A)o(bstr)n(act)-133 98 y @F4 @sf(The)9 b(Sup)q
(erconduc)q(ting)h(Sup)q(er)h(Collider)d(Lab)q(oratory)i(\(SSCL\))-1050
49 y(will)j(ha)o(v)o(e)h(man)o(y)f(subsystems)j(that)e(will)f(require)i
(real-time)f(mi-)-1051 50 y(cropro)q(cess)q(or)21 b(con)o(trol.)36 b
(Examples)20 b(of)f(suc)o(h)i(sub-systems)g(re-)-1049 50 y(quiring)d
(real-time)g(con)o(trols)h(are)g(p)q(o)o(w)o(er)g(supply)g(ramp)f(gener-)
-1049 50 y(ators)i(and)g(quenc)o(h)h(protection)g(monitors)e(for)h(the)h
(sup)q(ercon-)-1049 50 y(ducting)e(magnets.)35 b(W)m(e)19 b(plan)f(on)h
(using)g(a)g(commercial)g(m)o(ul-)-1051 49 y(titasking)14 b(real-time)h(k)o
(ernel)g(in)g(these)h(systems.)23 b(These)16 b(k)o(ernels)-1049 50 y(m)o
(ust)11 b(p)q(erform)g(in)f(a)g(consisten)o(t,)i(reliable)f(and)f(e\016cien)o
(t)h(manner.)-1050 50 y(Actual)20 b(p)q(erformance)h(measuremen)o(ts)g(ha)o
(v)o(e)f(b)q(een)g(conducted)-1048 50 y(on)f(four)g(di\013eren)o(t)h(k)o
(ernels,)h(all)d(running)h(on)g(the)h(same)f(hard-)-1050 50 y(w)o(are)12 b
(platform.)17 b(The)12 b(measuremen)o(ts)i(fall)c(in)o(to)i(t)o(w)o(o)g
(categories.)-1050 50 y(Throughput)21 b(measuremen)o(ts)i(co)o(v)o(ering)e
(the)h(\\non-real-time")-1051 49 y(asp)q(ects)15 b(of)e(the)h(k)o(ernel)g
(include)g(pro)q(cess)q 15 x(creation/termination)-1051 50 y(times,)d(in)o
(terpro)q(cess)q 12 x(comm)o(unication)e(facilities)h(in)o(v)o(olving)o
10 x(mes-)-1050 50 y(sages,)17 b(semaphores)g(and)g(shared)g(memory)f(and)g
(memory)g(allo-)o -1051 50 a(cation/deallo)q(cation.)o 17 x(Measuremen)o
(ts)q 15 x(concen)o(trating)f(on)e(real-)-1050 50 y(time)f(resp)q(onse)i
(are)f(con)o(text)g(switc)o(h)f(times,)g(in)o(terrupt)h(latencies)-1049
49 y(and)h(in)o(terrupt)g(task)g(resp)q(onse)q(.)-176 109 y(I.)g(INTR)o
(ODUCTION)-673 106 y(The)9 b(pro)q(cess)q 11 x(of)g(ev)n(aluating)f
(real-time)h(k)o(ernels)h(from)f(di\013eren)o(t)-1049 50 y(v)o(endors)15 b
(can)g(b)q(e)h(a)e(confusing)h(exp)q(erience)q(.)22 b(One)15 b(is)g(faced)g
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(and)18 b(adv)n(an)o(tages)f(o)o(v)o(er)h(their)h(comp)q(etitors.)31 b
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50 y(and)d(on)g(di\013eren)o(t)h(hardw)o(are)g(platforms)e(th)o(us)i
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49 y(w)o(ere)h(tested)g(on)e(the)h(same)g(hardw)o(are)g(platform.)j(The)d
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(single)f(b)q(oard)g(computer)g(with)g(a)g(25MHz)-1050 50 y(68030)d(from)h
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(from)g(Ready)h(Systems)h([3],)o 19 x(Vx-)-1050 50 y(W)m(orks)14 b
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50 y(\(v1.21\))e(from)g(Lynx)h(Real-Tim)o(e)f(Systems)i([5].)-726 53 y(It)
9 b(should)g(b)q(e)h(stresse)q(d)h(that)e(these)i(tests)f(only)f(pro)o
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(particular)g(system's)h(p)q(erformance.)-1050 50 y(Qualitativ)o(e)f(asp)q
(ects)q 14 x(suc)o(h)j(as)e(dev)o(elopmen)o(t)h(en)o(vironmen)o(t,)f(de-)
-1050 50 y(bug)21 b(capabilities,)g(connectivit)o(y)m(,)h(compliance)e
(with)h(industry)-1050 49 y 420 -2 z 26 w @F7 @sf(\003)2 12 y @F5 @sf(Op)q
(erated)6 b(b)o(y)h(the)h(Univ)o(ersit)o(ies)e(Researc)o(h)g(Asso)q
(ciation,)o 8 x(Inc.,)h(for)g(the)g(U.S.)-1050 40 y(Departmen)o(t)o 11 x
(of)k(Energy)f(under)g(Con)o(tract)g(No.)15 b(DE-A)o(C02-89ER4048)o(6.)80
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(maxim)o(um)o -1051 50 a(and)g(minim)o(um)o 11 x(a)o(v)o(erage)h(v)n
(alues.)k(Clo)q(c)o(k)12 b(resolution,)g(n)o(um)o(b)q(er)h(of)-1051 50 y
(iterations)j(and)g(cac)o(he)h(conditions)e(w)o(ere)i(iden)o(tical)f(for)f
(all)g(four)-1050 49 y(k)o(ernels.)20 96 y(I)q(I.)e(THR)o(OUGHPUT)h
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(in)f(T)m(able)g(1)h(and)-1050 50 y(what)19 b(follo)o -1 x(ws)f(is)g(a)h
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(ears)f(in)f(the)h(table.)25 b(Idiosyncrasies)17 b(of)e(eac)o(h)i(k)o
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(means)g(that)g(a)g(particular)f(test)i(could)-1050 50 y(not)d(b)q(e)g(p)q
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(it)g(tak)o(es)-1049 50 y(to)h(create)i(and)e(delete)h(a)f(task.)18 b(A)
12 b(task)h(deletes)g(itself)f(as)h(so)q(on)f(as)-1050 50 y(it)j(is)g
(created.)24 b(The)15 b(created)q 16 x(task)h(has)f(a)g(higher)g(priorit)o
(y)g(than)-1050 49 y(the)f(creator,)h(so)f(the)g(time)g(quoted)g(actually)f
(includes)h(a)g(create,)-1049 50 y(start,)g(delete)h(and)f(t)o(w)o(o)f
(task)h(con)o(text)h(switc)o(hes.)-787 51 y @F2 @sf(2.)j(Ping)12 b(Susp)n
(end/R)q -2 x(esume)h(T)m(ask)e @F4 @sf(A)g(lo)o(w)f(priorit)o(y)g(task)g
(resumes)-1048 50 y(a)20 b(susp)q(ende)q(d)i(high)d(priorit)o(y)h(task.)
38 b(The)20 b(high)g(priorit)o(y)g(task)-1050 50 y(immediately)c(susp)q
(en)q(ds)j(itself.)31 b(This)17 b(measuremen)o(t)i(includes)-1049 49 y(t)o
(w)o(o)12 b(task)g(con)o(text)h(switc)o(hes)g(and)f(the)g(time)g(it)g(tak)o
(es)g(to)g(susp)q(end)-1048 50 y(and)18 b(resume)i(a)e(task.)32 b(There)
20 b(is)e(no)h(facilit)o(y)e(to)h(susp)q(end)i(and)-1050 50 y(resume)g(a)e
(task)h(on)g(LynxOS)g(apart)g(from)f(using)g(signals.)32 b(So)-1050 50 y
(this)14 b(test)h(w)o(as)f(not)f(p)q(erformed)i(under)g(LynxOS.)-792 50 y
@F2 @sf(3.)k(Susp)n(end/R)n(esume)d(T)m(ask)c @F4 @sf(This)h(is)f(iden)o
(tical)g(to)h(previous)g(test)-1049 50 y(except)19 b(that)e(a)g(high)f
(priorit)o(y)h(task)g(susp)q(ends)q 18 x(and)g(resumes)q 18 x(a)-1050 50 y
(susp)q(ende)q(d)g(lo)o(w)o(er)f(priorit)o(y)g(task)g(so)h(that)f(there)i
(is)e(no)g(con)o(text)-1049 50 y(switc)o(hing.)-182 51 y @F2 @sf(4.)i
(Ping)12 b(Semaphor)n(e)g @F4 @sf(Tw)o(o)e(tasks)h(of)f(the)h(same)g
(priorit)o(y)f(comm)o(u-)-1051 49 y(nicate)g(with)f(eac)o(h)h(other)g
(through)f(semaphores.)18 b(T)m(ask)9 b(A)g(creates)-1048 50 y(a)k
(semaphore,)g(gets)h(the)g(semaphore)f(and)g(then)h(creates)h(T)m(ask)e(B)
-1050 50 y(whic)o(h)e(blo)q(c)o(ks)h(when)g(it)g(attempts)g(to)f(get)h
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(semaphore)f(whic)o(h)g(immediately)e(un)o(blo)q(c)o(ks)-1050 50 y(T)m
(ask)j(B.)h(T)m(ask)f(A)h(then)h(attempts)f(to)g(get)g(the)g(semaphore)h
(whic)o(h)-1050 49 y(causes)k(it)d(to)h(blo)q(c)o(k)g(un)o(til)g(T)m(ask)f
(B)i(releases)h(it.)k(The)16 b(t)o(w)o(o)e(tasks)-1049 50 y(then)d
(alternate)g(o)o(wnership)g(of)f(the)h(semaphore)g(thereb)o(y)h(causing)
-1050 50 y(con)o(text)h(switc)o(hes.)18 b(In)13 b(our)f(v)o(ersion)g(of)g
(VxW)m(orks,)f(t)o(w)o(o)h(separate)-1049 50 y(semaphores)g(are)g
(required)g(b)q(ecause)h(round-robin)e(sc)o(heduling)g(is)-1050 50 y(not)j
(supp)q(orted.)-266 50 y @F2 @sf(5.)38 b(Getting/R)n(ele)n(asing)22 b
(Semaphor)n(e)f @F4 @sf(The)h(time)e(rep)q(orted)j(in-)-1051 50 y(cludes)e
(the)f(time)g(it)f(tak)o(es)i(to)e(get)i(and)e(immediately)g(release)-1049
50 y(a)14 b(semaphore)g(within)f(the)i(same)f(task)g(con)o(text.)-779 51 y
@F2 @sf(6.)20 b(Queue)c(Fil)r(l,Dr)n(ain,Fil)r(l)e(Ur)n(gent)f @F4 @sf(W)m
(e)h(\014rst)i(time)e(ho)o(w)g(long)f(it)-1050 50 y(tak)o(es)i(to)f(\014ll)f
(a)i(queue)g(with)f(messages)h(and)g(then)g(w)o(e)f(time)g(ho)o(w)-122 311 y
(P)o(age)g(1)-2052 b
1 @eop1
------------------------CUT HERE--------------------------
--
+--------------------------------------------------------------------------+
| Carl W. Kalbfleisch cwk@psychosis.ssc.gov |
| Superconducting Super Collider Laboratory |
| 2550 Beckleymeade Avenue, MS-4002 |
| Dallas, Texas 75237 (214) 708-3428 |
+--------------------------------------------------------------------------+