On ubuntu (specifically Zorin 16.1), there is a substantial performance
difference between the SOX binary supplied with LMS and SOX compiled
natively.
Testing has been done with various versions of LMS (7.9.3 to 8.2.0).
The flac file under test is 16 bit, stereo, 44.1 kHz, being the Albert
King track "Born Under A Bad Sign" from the album of the same name. File
size is 17mb
Test results are the same for any number of different tracks.
Using a "/tmp" that is memory mounted (to negate questions around disk
access.. the results are the same when redirecting to /dev/null), if we
run the following script:
df /tmp
pwd
time dd if=./test1.flac | ./soxlms -D -q -t flac - -t flac -C 0 -b 24
--buffer 131072 - gain -h -n -4 rate -v -b 95.4 -p 45 -a 96000 >
./bob1.flac
time dd if=./test1.flac | ./soxlms -D -q -t flac - -t flac -C 0 -b 24
--buffer 131072 - gain -h -n -4 rate -v -b 95.4 -p 45 -a 96000 >
./bob1.flac
time dd if=./test1.flac | ./soxlms -D -q -t flac - -t flac -C 0 -b 24
--buffer 131072 - gain -h -n -4 rate -v -b 95.4 -p 45 -a 96000 >
./bob1.flac
time dd if=./test1.flac | ./soxlms -D -q -t flac - -t flac -C 0 -b 24
--buffer 131072 - gain -h -n -4 rate -v -b 95.4 -p 45 -a 96000 >
./bob1.flac
ls -l ./test1.flac ./bob1.flac
time dd if=./test1.flac | ./soxnew -D -q -t flac - -t flac -C 0 -b 24
--buffer 131072 - gain -h -n -4 rate -v -b 95.4 -p 45 -a 96000 >
./bob1.flac
time dd if=./test1.flac | ./soxnew -D -q -t flac - -t flac -C 0 -b 24
--buffer 131072 - gain -h -n -4 rate -v -b 95.4 -p 45 -a 96000 >
./bob1.flac
time dd if=./test1.flac | ./soxnew -D -q -t flac - -t flac -C 0 -b 24
--buffer 131072 - gain -h -n -4 rate -v -b 95.4 -p 45 -a 96000 >
./bob1.flac
time dd if=./test1.flac | ./soxnew -D -q -t flac - -t flac -C 0 -b 24
--buffer 131072 - gain -h -n -4 rate -v -b 95.4 -p 45 -a 96000 >
./bob1.flac
ls -l ./test1.flac ./bob1.flac
We get the following results:
Filesystem 1K-blocks Used Available Use% Mounted on
tmpfs 1048576 44908 1003668 5% /tmp
/tmp
34031+1 records in
34031+1 records out
17424195 bytes (17 MB, 17 MiB) copied, 0.314792 s, 55.4 MB/s
real 0m4.443s
user 0m4.437s
sys 0m0.088s
34031+1 records in
34031+1 records out
17424195 bytes (17 MB, 17 MiB) copied, 0.313073 s, 55.7 MB/s
real 0m4.435s
user 0m4.412s
sys 0m0.105s
34031+1 records in
34031+1 records out
17424195 bytes (17 MB, 17 MiB) copied, 0.313596 s, 55.6 MB/s
real 0m4.434s
user 0m4.445s
sys 0m0.070s
34031+1 records in
34031+1 records out
17424195 bytes (17 MB, 17 MiB) copied, 0.311058 s, 56.0 MB/s
real 0m4.445s
user 0m4.396s
sys 0m0.126s
-rw-rw-r-- 1 ricko ricko 58054942 Oct 10 12:42 ./bob1.flac
-rw-rw-r-- 1 ricko ricko 17424195 Oct 10 12:41 ./test1.flac
34031+1 records in
34031+1 records out
17424195 bytes (17 MB, 17 MiB) copied, 0.253777 s, 68.7 MB/s
real 0m1.760s
user 0m1.722s
sys 0m0.092s
34031+1 records in
34031+1 records out
17424195 bytes (17 MB, 17 MiB) copied, 0.240268 s, 72.5 MB/s
real 0m1.745s
user 0m1.711s
sys 0m0.101s
34031+1 records in
34031+1 records out
17424195 bytes (17 MB, 17 MiB) copied, 0.23839 s, 73.1 MB/s
real 0m1.742s
user 0m1.728s
sys 0m0.083s
34031+1 records in
34031+1 records out
17424195 bytes (17 MB, 17 MiB) copied, 0.241787 s, 72.1 MB/s
real 0m1.743s
user 0m1.705s
sys 0m0.109s
-rw-rw-r-- 1 ricko ricko 58054942 Oct 10 12:43 ./bob1.flac
-rw-rw-r-- 1 ricko ricko 17424195 Oct 10 12:41 ./test1.flac
Note the run time difference between the two and the fact the upsampled
file sizes (bob1.flac) are the same.
This test shows that on average, the LMS supplied SOX takes 4.44 seconds
to run while the natively compiled one takes 1.74 seconds meaning the
LMS version is 2.5 times slower.
The respective SOX exe's have the following basic profile:
soxlms: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically
linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.18,
stripped
soxnew: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV),
dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for
GNU/Linux 3.2.0, with debug_info, not stripped
I didnt bother to strip my exe.
My GCC version is *gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1) *
Looking at "ldd" we see a large difference in libraries used:
*ldd soxlms*
linux-vdso.so.1 (0x00007ffc6cdef000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ffbac6ea000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ffbac4f8000)
/lib64/ld-linux-x86-64.so.2 (0x00007ffbac85d000)
LDD SOXNEW
linux-vdso.so.1 (0x00007ffd7e9de000)
libsox.so.3 => /lib/x86_64-linux-gnu/libsox.so.3 (0x00007faec1ffa000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007faec1eab000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
(0x00007faec1e88000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007faec1c96000)
libltdl.so.7 => /lib/x86_64-linux-gnu/libltdl.so.7
(0x00007faec1c8b000)
libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16
(0x00007faec1c53000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007faec1c35000)
libmagic.so.1 => /lib/x86_64-linux-gnu/libmagic.so.1
(0x00007faec1c0d000)
libgsm.so.1 => /lib/x86_64-linux-gnu/libgsm.so.1 (0x00007faec1bfe000)
libgomp.so.1 => /lib/x86_64-linux-gnu/libgomp.so.1
(0x00007faec1bbc000)
/lib64/ld-linux-x86-64.so.2 (0x00007faec20bc000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007faec1bb6000)
liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5
(0x00007faec1b8b000)
libbz2.so.1.0 => /lib/x86_64-linux-gnu/libbz2.so.1.0
(0x00007faec1b78000)
Looking at "top" during the testing, the LMS SOX binary uses 100% CPU
(the test system isnt a dog!!!) while the natively compiled SOX binary
uses ~43% CPU
Obviously for me, the issue isnt an issue cause I have recompiled SOX so
justed wanted to raise this more as an FYI than an issue.
Peter
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