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Added benchmarks over mounting an unformatted disk

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These locally show the expected O(d(n)) growth of the block_size search
when block_count is known.

A rough estimate of runtime for a 1 GiB device with a 90 MiB/s read bandwidth
(using the mt25q for rough numbers):

  known bs/bc       => ~1.44 us
  known block_size  => ~1.44 us
  known block_count => ~125 us
  unknown bs/bc     => ~376 ms
This commit is contained in:
Christopher Haster
2022-11-13 21:30:57 -06:00
parent 34b5b39551
commit f198c855f6
4 changed files with 48 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files
bd/lfs_emubd.c
+3 -1
View File
@@ -220,7 +220,9 @@ int lfs_emubd_read(const struct lfs_config *cfg, lfs_block_t block,
lfs_emubd_t *bd = cfg->context;
// check if read is valid
LFS_ASSERT(block < bd->cfg->erase_count);
if (block >= bd->cfg->erase_count) {
return LFS_ERR_INVAL;
}
LFS_ASSERT(off % bd->cfg->read_size == 0);
LFS_ASSERT(size % bd->cfg->read_size == 0);
LFS_ASSERT(off+size <= bd->cfg->erase_size);
bd/lfs_filebd.c
+3 -1
View File
@@ -70,7 +70,9 @@ int lfs_filebd_read(const struct lfs_config *cfg, lfs_block_t block,
lfs_filebd_t *bd = cfg->context;
// check if read is valid
LFS_ASSERT(block < bd->cfg->erase_count);
if (block >= bd->cfg->erase_count) {
return LFS_ERR_INVAL;
}
LFS_ASSERT(off % bd->cfg->read_size == 0);
LFS_ASSERT(size % bd->cfg->read_size == 0);
LFS_ASSERT(off+size <= bd->cfg->erase_size);
bd/lfs_rambd.c
+3 -1
View File
@@ -60,7 +60,9 @@ int lfs_rambd_read(const struct lfs_config *cfg, lfs_block_t block,
lfs_rambd_t *bd = cfg->context;
// check if read is valid
LFS_ASSERT(block < bd->cfg->erase_count);
if (block >= bd->cfg->erase_count) {
return LFS_ERR_INVAL;
}
LFS_ASSERT(off % bd->cfg->read_size == 0);
LFS_ASSERT(size % bd->cfg->read_size == 0);
LFS_ASSERT(off+size <= bd->cfg->erase_size);
benches/bench_superblock.toml
+39 -11
View File
@@ -1,4 +1,15 @@
[cases.bench_superblocks_found]
[cases.bench_superblocks_format]
code = '''
lfs_t lfs;
BENCH_START();
lfs_format(&lfs, cfg) => 0;
BENCH_STOP();
'''
[cases.bench_superblocks_mount]
defines.KNOWN_BLOCK_SIZE = [true, false]
defines.KNOWN_BLOCK_COUNT = [true, false]
# support benchmarking with files
defines.N = [0, 1024]
defines.FILE_SIZE = 8
@@ -28,6 +39,18 @@ code = '''
}
lfs_unmount(&lfs) => 0;
if (KNOWN_BLOCK_SIZE) {
cfg->block_size = BLOCK_SIZE;
} else {
cfg->block_size = 0;
}
if (KNOWN_BLOCK_COUNT) {
cfg->block_count = BLOCK_COUNT;
} else {
cfg->block_count = 0;
}
BENCH_START();
lfs_mount(&lfs, cfg) => 0;
BENCH_STOP();
@@ -35,22 +58,27 @@ code = '''
lfs_unmount(&lfs) => 0;
'''
[cases.bench_superblocks_missing]
[cases.bench_superblocks_mount_missing]
defines.KNOWN_BLOCK_SIZE = [true, false]
defines.KNOWN_BLOCK_COUNT = [true, false]
code = '''
lfs_t lfs;
if (KNOWN_BLOCK_SIZE) {
cfg->block_size = BLOCK_SIZE;
} else {
cfg->block_size = 0;
}
if (KNOWN_BLOCK_COUNT) {
cfg->block_count = BLOCK_COUNT;
} else {
cfg->block_count = 0;
}
BENCH_START();
int err = lfs_mount(&lfs, cfg);
assert(err != 0);
BENCH_STOP();
'''
[cases.bench_superblocks_format]
code = '''
lfs_t lfs;
BENCH_START();
lfs_format(&lfs, cfg) => 0;
BENCH_STOP();
'''