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Increase default disk cache to 16 MiB

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This commit is contained in:
Andrea Mazzoleni 2022-01-09 17:43:18 +01:00
parent 02d170c004
commit eb19c79039
3 changed files with 5 additions and 4 deletions
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1
HISTORY
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@ -4,6 +4,7 @@ SnapRAID HISTORY
12.1 2022/01
============
* Reduce stack usage to work in enviromnents with limited stack size, like MUSL.
* Increase the default disk cache from 8 MiB to 16 MiB.
12.0 2021/12
============

4
cmdline/io.c
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@ -879,9 +879,9 @@ void io_init(struct snapraid_io* io, struct snapraid_state* state,
#if HAVE_THREAD
if (io_cache == 0) {
/* default is 8 MiB of cache */
/* default is 16 MiB of cache */
/* this seems to be a good tradeoff between speed and memory usage */
io->io_max = 8 * 1024 * 1024 / state->block_size;
io->io_max = 16 * 1024 * 1024 / state->block_size;
if (io->io_max < IO_MIN)
io->io_max = IO_MIN;
if (io->io_max > IO_MAX)

4
cmdline/io.h
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@ -35,8 +35,8 @@
* 4 - 452 MB/s, CPU 54%, speed 118%
* 8 - 487 MB/s, CPU 60%, speed 128%
* 16 - 505 MB/s, CPU 63%, speed 132%
* 32 - 520 MB/s, CPU 64%, speed 136%
* 64 - 524 MB/s, CPU 65%, speed 137%
* 32 - 520 MB/s, CPU 64%, speed 136% [SnapRAID <= 12.0]
* 64 - 524 MB/s, CPU 65%, speed 137% [SnapRAID > 12.0]
* 128 - 525 MB/s, CPU 66%, speed 138%
*/
#define IO_MIN 3 /* required by writers, readers can work also with 2 */