Ex8 and minor improvements

sheet3/1/output.txt

@@ -0,0 +1,60 @@
+rm -f *.exe *.o
+gcc -O3    -c -o mysecond.o mysecond.c
+gcc -O3  -c mysecond.c
+gfortran -O3 -DSTREAM_ARRAY_SIZE=80000000 -DNTIMES=20   -c stream.f
+gfortran -O3 stream.o mysecond.o -o stream_f.exe
+gcc -O3  -DSTREAM_ARRAY_SIZE=80000000 -DNTIMES=20  stream.c -o stream_c.exe
+gcc -O3  -DUNIX flops.c -o flops.exe
+./stream_c.exe
+-------------------------------------------------------------
+STREAM version $Revision: 5.10 $
+-------------------------------------------------------------
+This system uses 8 bytes per array element.
+-------------------------------------------------------------
+Array size = 80000000 (elements), Offset = 0 (elements)
+Memory per array = 610.4 MiB (= 0.6 GiB).
+Total memory required = 1831.1 MiB (= 1.8 GiB).
+Each kernel will be executed 20 times.
+ The *best* time for each kernel (excluding the first iteration)
+ will be used to compute the reported bandwidth.
+-------------------------------------------------------------
+Your clock granularity/precision appears to be 1 microseconds.
+Each test below will take on the order of 59858 microseconds.
+   (= 59858 clock ticks)
+Increase the size of the arrays if this shows that
+you are not getting at least 20 clock ticks per test.
+-------------------------------------------------------------
+WARNING -- The above is only a rough guideline.
+For best results, please be sure you know the
+precision of your system timer.
+-------------------------------------------------------------
+Function    Best Rate MB/s  Avg time     Min time     Max time
+Copy:           23508.2     0.063228     0.054449     0.074427
+Scale:          18323.7     0.089940     0.069855     0.116932
+Add:            19762.6     0.276166     0.097153     3.054857
+Triad:          19559.9     0.123390     0.098160     0.156530
+-------------------------------------------------------------
+Solution Validates: avg error less than 1.000000e-13 on all three arrays
+-------------------------------------------------------------
+./flops.exe
+
+   FLOPS C Program (Double Precision), V2.0 18 Dec 1992
+
+   Module     Error        RunTime      MFLOPS
+                            (usec)
+     1      4.0146e-13      0.0029   4831.3737
+     2     -1.4166e-13      0.0006  11258.2969
+     3      4.7184e-14      0.0031   5448.3769
+     4     -1.2557e-13      0.0030   5042.5895
+     5     -1.3800e-13      0.0060   4867.7339
+     6      3.2380e-13      0.0054   5322.4399
+     7     -8.4583e-11      0.0031   3907.7854
+     8      3.4867e-13      0.0056   5323.6214
+
+   Iterations      =  512000000
+   NullTime (usec) =     0.0000
+   MFLOPS(1)       =  8348.0311
+   MFLOPS(2)       =  4650.8807
+   MFLOPS(3)       =  5016.3434
+   MFLOPS(4)       =  5297.2428
+