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Set the default IO size to 256KiB.

Browse Source 
src/filemanager/ioblksize.h: Add updated test results and increase value
from 128KiB to 256KiB.

This was previously 128KiB and increasing to 256KiB was seen to increase
throughput by 10-20% when reading cached files on modern systems.

Sync with GNU coreutils fcfba90d0d27a1bacf2020bac4dbec74ed181028.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
This commit is contained in:
Andrew Borodin 2024-03-03 18:12:10 +03:00
parent 93a4b2ab79
commit 933b111a5d
1 changed files with 19 additions and 15 deletions
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34
src/filemanager/ioblksize.h
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@ -21,8 +21,8 @@
/* *INDENT-OFF* */
/* As of May 2014, 128KiB is determined to be the minimum
blksize to best minimize system call overhead.
/* As of Feb 2024, 256KiB is determined to be the best blksize
to minimize system call overhead across most systems.
This can be tested with this script:
for i in $(seq 0 10); do
@ -41,21 +41,25 @@
system #5: 2.30GHz i7-3615QM with 1600MHz DDR3, arch=x86_64
system #6: 1.30GHz i5-4250U with 1-channel 1600MHz DDR3, arch=x86_64
system #7: 3.55GHz IBM,8231-E2B with 1066MHz DDR3, POWER7 revision 2.1
system #8: 2.60GHz i7-5600U with 1600MHz DDR3, arch=x86_64
system #9: 3.80GHz IBM,02CY649 with 2666MHz DDR4, POWER9 revision 2.3
system 10: 2.95GHz IBM,9043-MRX, POWER10 revision 2.0
system 11: 3.23Ghz Apple M1 with 2666MHz DDR4, arch=arm64
per-system transfer rate (GB/s)
blksize #1 #2 #3 #4 #5 #6 #7
blksize #1 #2 #3 #4 #5 #6 #7 #8 #9 10 11
------------------------------------------------------------------------
1024 .73 1.7 2.6 .64 1.0 2.5 1.3
2048 1.3 3.0 4.4 1.2 2.0 4.4 2.5
4096 2.4 5.1 6.5 2.3 3.7 7.4 4.8
8192 3.5 7.3 8.5 4.0 6.0 10.4 9.2
16384 3.9 9.4 10.1 6.3 8.3 13.3 16.8
32768 5.2 9.9 11.1 8.1 10.7 13.2 28.0
65536 5.3 11.2 12.0 10.6 12.8 16.1 41.4
131072 5.5 11.8 12.3 12.1 14.0 16.7 54.8
262144 5.7 11.6 12.5 12.3 14.7 16.4 40.0
524288 5.7 11.4 12.5 12.1 14.7 15.5 34.5
1048576 5.8 11.4 12.6 12.2 14.9 15.7 36.5
1024 .73 1.7 2.6 .64 1.0 2.5 1.3 .9 1.2 2.5 2.0
2048 1.3 3.0 4.4 1.2 2.0 4.4 2.5 1.7 2.3 4.9 3.8
4096 2.4 5.1 6.5 2.3 3.7 7.4 4.8 3.1 4.6 9.6 6.9
8192 3.5 7.3 8.5 4.0 6.0 10.4 9.2 5.6 9.1 18.4 12.3
16384 3.9 9.4 10.1 6.3 8.3 13.3 16.8 8.6 17.3 33.6 19.8
32768 5.2 9.9 11.1 8.1 10.7 13.2 28.0 11.4 32.2 59.2 27.0
65536 5.3 11.2 12.0 10.6 12.8 16.1 41.4 14.9 56.9 95.4 34.1
131072 5.5 11.8 12.3 12.1 14.0 16.7 54.8 17.1 86.5 125.0 38.2
-> 262144 5.7 11.6 12.5 12.3 14.7 16.4 40.0 18.0 113.0 148.0 41.3 <-
524288 5.7 11.4 12.5 12.1 14.7 15.5 34.5 18.0 104.0 153.0 43.1
1048576 5.8 11.4 12.6 12.2 14.9 15.7 36.5 18.2 87.9 114.0 44.8
Note that this is to minimize system call overhead.
@ -73,7 +77,7 @@
*/
enum { IO_BUFSIZE = 128 * 1024 };
enum { IO_BUFSIZE = 256 * 1024 };
/* *INDENT-ON* */