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Section Subsections Page70 60 10 01FORTRAN EXECUTION TIMESProcessingIt is possible to estimate the length of time it willtake to execute an arithmetic block of FORTRANcoding. Inspect your coding sheets, or programlistings, and count the average number of times theoperations shown in Figure 70.33 will be executed.Then use the times shown in Figure 70.33 toestimate the total execution time.Note that you must consider the probability ofexecution, not just the number of appearances. Ifa certain loop will be executed 15 times, on theOperationApproximate` time inMicroseconds,• each execution(time for standard precisionuse in parentheses)OperationApproximate* time inMicroseconds,'" each execution(time for standard precisionuse in parentheses)GET 2250 + 2190C real = 300 (360)PUT 3450 + 3090 C integer = 22EDIT630+ 90 S + 180 MMOVE 300 + 45 C +real 440 (460FILL 300 + 30 C +integer 12WHOLE 1400 -real 490 (560)NCOMP 250 + 75 C -integer 12NZONE 350 *real 790 (560)!COMP 500 + 95 C *integer 30NSIGN 240 /real 2100 (800)ADD 2160+ 216 L /integer 80SUB2160+ 216 LMPY 2400+ 120 P real”real 13300 (8000)DIV 4000 + 0(445 + 667 DIV) integer*•integer 4700 (3800)Al DEC 700+ 54A FLOAT 330DECA1 180+ 117 A FIX 140Al A3 470+ 1084 A subscript (no variable) 25A3A1545+ 156 APACK 360 + 63 A subscript (one variable) 280UNPAC420+ 66 ADPACK 392 D subscript (two variables) 390DUNPK360 DSIN 5400 13000) subscript (three variables) 530COS 5900 (3400)ATAN 8900 (5300) DO 22 + 50 NSORT 10400 (4500) IF (real) 190 (210)EXP 4400 (2000) IF (integer) 30ALOG 8000 (5100)TANH 8100 (4300) GO TO 7GO TO ( 1, N 7N = The number of times through the DO loopC = Length of the field, in charactersS = Length of the source fieldM = Length of the edit maskP = Length of the multiplier field x length of the multiplicand field(significant digits only — don't count leading zeros)A = Length of the Al fieldD = Length of the packed decimal (D4) fieldL = Length of the longer of the two fields (significant digits onlydon't count leading zeros)Q = Number of significant digits in the quotient (result) fieldDIV = Number of significant digits in the divisor (denominator) field• Most timings are approximate and are based on test runs of "typical" cases, using fields of "average" size,magnitude, etc. Unusual cases may (or may not) differ significantly from the timings obtained from thegiven equations. This is particularly true of the decimal arithmetic routines (ADD, SUB, MPY, DIV).** Based on 3.6-microsecond CPU cycle speed. Multiply by 0.6 to obtain timings on 2.2-microsecond CPU.Figure 70. 33,
Section Subsections Page70 60 10 02average, every operation within it should be counted15 times. If, in the other hand, a certain routine isonly executed half the time, it should be counted ashalf an execution. To illustrate:X=X+6IF(X-77.)1,2,11 Z=X*14.GO TO 32 Z=X*16. /W3 CONTINUEIf you assume extended precision, and a probabilityof one-third for path 1 and two-thirds forpath 2, the estimated execution time isOperation No. of Times x Unit Time * Total*1+1/3+2/3=2 330 6601 440 4401 490 4901/3+2/3=1 790 7902/3 2100 1400FLOAT 1 330 330(6 to 6.0)IF (real) 1 190 190GO TO 1 7 74307*In microsecondsOn the average, then, this portion of your programwill require 4307 microseconds, or 4.307milliseconds, or .004307 seconds.Figures 70.34 through 70.40 show someadditional examples.
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