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This has basically been copied over from Musl and slightly modifed.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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The source code of a modified liblz4 and zlib are included with the
option to compile them into libsquashfs if they are not available on
the system.
So far, the source code was included directly in the compressor sub
directory within libsqsuashfs. This commit moves the libraries out
into the lib directory.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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With `perf record`/`perf report` I saw that 30% of the time was spent in
`sqfs_frag_table_find_tail_end` with tar2sqfs for a tarball containing
the Gentoo ebuild repository (many thousands of small files).
The reason was the bucketing hash table in frag_table.c: too many
elements in too few buckets meant lots of walking over the linked lists.
This patch replaces that hash table with the hash table implementation
from Mesa. Its implementation is more complex (is is an open-addressing,
linear-reprobing) hash table, but it is much better suited for the task.
On my 4c/8t Skylake, the time to run tar2sqfs drops from 7.5s to less
than 3s. CPU usage increases from ~207% to ~356%, presumably indicating
an increase in available parallelism due to the removal of the hash
table as a bottleneck. The `perf report` profile with this patch shows
that the time spent in `sqfs_frag_table_find_tail_end` has dropped from
~30% to 0.01%.
Output from ministat:
x before
+ after
N Min Max Median Avg Stddev
x 20 7.476 7.685 7.5725 7.5615 0.051254268
+ 20 2.79 2.901 2.846 2.84475 0.03543842
Difference at 95.0% confidence
-4.71675 +/- 0.0282015
-62.3785% +/- 0.241477%
(Student's t, pooled s = 0.0440618)
I imported only the bits of the hash table implementation that were
needed for frag_table.c. Among the changes I made after importing are
- removed usage of ralloc, Mesa's recursive memory allocator
- Replaced ralloc -> malloc
ralloc_free -> free
rzalloc_array -> calloc
- Removed mem_ctx parameters
- Added free()s to the appropriate places (valgrind confirms there
are no leaks)
- removed _mesa_-prefix from function names
Fixes: #40
Signed-off-by: Matt Turner <mattst88@gmail.com>
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Signed-off-by: Matt Turner <mattst88@gmail.com>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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- Add libutil to the README file
- Try to make the COPYING file somewhat more comprehensible
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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