[Octave-bug-tracker] [bug #54100] fread using SKIP larger than zero is extremely slow

[Dan Sebald]

Follow-up Comment #9, bug #54100 (project octave):

There are about 20 tests involving fread() in the file io.tst, and of those
maybe a half dozen involve the SKIP parameter:


test/io.tst:%!       x(i) = fread (id, [1, 1], type_list{i});
test/io.tst:%!   s_out = fread (id, numel (s_in), sprintf ("%s=>%s", cls,
cls));
test/io.tst:%!   m_out = fread (id, numel (m_in), sprintf ("%s=>%s", cls,
cls));
test/io.tst:%! y = fread (id, Inf, "uchar=>char");
test/io.tst:%!error <Invalid call to fread> fread ()
test/io.tst:%!error <Invalid call to fread> fread (1, 2, "char", 1, "native",
2)
test/io.tst:%!error fread ("foo")
test/io.tst:%! [data, count] = fread (id);
test/io.tst:%! [data, count] = fread (id, 'int16');
test/io.tst:%! [data, count] = fread (id, [10, 2], 'int16');
test/io.tst:%! [data, count] = fread (id, [2, 10], 'int16');
test/io.tst:%! [data, count] = fread (id, inf, "2*uint8", 2);
test/io.tst:%! [data, count] = fread (id, 3, "2*uint8", 3);
test/io.tst:%! [data, count] = fread (id, 3, "2*uint8", 3);
test/io.tst:%! [data, count] = fread (id, 3, "2*uint8", 3);
test/io.tst:%! [data, count] = fread (id, 3, "2*uint8", 3);
test/io.tst:%! [data, count] = fread (id, [1, Inf], "4*uint16", 3);
test/io.tst:%! [data, count] = fread (id, [3, Inf], "4*uint16", 3);
test/io.tst:%! [data, count] = fread (id, [2, 3], "char");


They mostly seem to require an fwrite() prior to generate a file.

These tests can be run via


octave:7> [p, n, xf, xb, sk, rtsk, rgrs] = test
("/home/linux/octave/octave/octave/test/io.tst")
p =  157
n =  157
xf = 0
xb = 0
sk = 0
rtsk = 0
rgrs = 0


However, this test takes quite long to run so isn't suitable for the
write-and-debug stage.

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