littlefs/benches/bench_rt.toml

# High-level read-throughput benchmarks
after = ['bench_file', 'bench_dir', 'bench_wt']

# these are common and can be overridden suite-wide
#
# note for bench_*_many, file size defaults to CHUNK, and SIZE = sum of
# all files
#
defines.SIZE = '1024*1024' # 1 MiB
defines.CHUNK = 64
defines.SEED = 42

# simulated time, in nanoseconds, to run the bench
defines.SIM_TIME = '60ULL*60ULL*1000ULL*1000ULL*1000ULL' # 1 hour
# simulation size in bytes
defines.SIM_SIZE = 0

# set this to true to skip bench warmup
defines.SKIP_WARMUP = false

# include common bench helpers
code = '''
    #include "benches/bench_helpers.h"
'''


# sequential read throughput
[cases.bench_rt_seq]
code = '''
    lfs3_t lfs3;
    lfs3_format(&lfs3, LFS3_F_RDWR, CFG) => 0;
    lfs3_mount(&lfs3, LFS3_M_RDWR, CFG) => 0;
    if (!SKIP_WARMUP) {
        BENCH_PAUSE();
        int err = bench_helpers_warmup(&lfs3);
        if (err) {
            LFS3_ERROR("Bench warmup failed: %d", err);
            return;
        }
        BENCH_RESUME();
    }
    uint32_t prng = SEED;

    // reset our timer
    BENCH_SIMRESET();

    // create a file to read
    lfs3_file_t file;
    lfs3_file_open(&lfs3, &file, "bench_linear",
            LFS3_O_WRONLY | LFS3_O_CREAT | LFS3_O_EXCL) => 0;
    for (lfs3_size_t i = 0; i < (SIZE+(CHUNK-1))/CHUNK; i++) {
        uint8_t wbuf[CHUNK];
        for (lfs3_size_t j = 0; j < CHUNK; j++) {
            wbuf[j] = 'a' + (BENCH_PRNG(&prng) % 26);
        }
        lfs3_file_write(&lfs3, &file, wbuf, CHUNK) => CHUNK;

        // taking too long?
        if (SIM_TIME && BENCH_SIMTIME() >= SIM_TIME) {
            return;
        }
    }
    lfs3_file_close(&lfs3, &file) => 0;

    // reset our timer
    BENCH_SIMRESET();

    // open the file
    BENCH_START("read");
    lfs3_file_open(&lfs3, &file, "bench_linear", LFS3_O_RDONLY) => 0;
    lfs3_off_t size = 0;
    uint64_t readed = 0;
    while (!(SIM_SIZE && readed >= (uint64_t)SIM_SIZE)
            && !(SIM_TIME && BENCH_SIMTIME() >= SIM_TIME)) {
        // read from the file
        uint8_t rbuf[CHUNK];
        lfs3_file_read(&lfs3, &file, rbuf, CHUNK) => CHUNK;

        size += CHUNK;
        readed += CHUNK;

        // rewind if we reach the end
        if (size >= SIZE) {
            lfs3_file_rewind(&lfs3, &file) => 0;
            size = 0;
        }
    }
    lfs3_file_close(&lfs3, &file) => 0;
    // report the amount we managed to read
    BENCH_STOP("read", readed);

    lfs3_unmount(&lfs3) => 0;
'''

# random read throughput
[cases.bench_rt_random]
code = '''
    lfs3_t lfs3;
    lfs3_format(&lfs3, LFS3_F_RDWR, CFG) => 0;
    lfs3_mount(&lfs3, LFS3_M_RDWR, CFG) => 0;
    if (!SKIP_WARMUP) {
        BENCH_PAUSE();
        int err = bench_helpers_warmup(&lfs3);
        if (err) {
            return;
        }
        BENCH_RESUME();
    }
    uint32_t prng = SEED;

    // reset our timer
    BENCH_SIMRESET();

    // create a file to read
    lfs3_file_t file;
    lfs3_file_open(&lfs3, &file, "bench_random",
            LFS3_O_WRONLY | LFS3_O_CREAT | LFS3_O_EXCL) => 0;
    for (lfs3_size_t i = 0; i < (SIZE+(CHUNK-1))/CHUNK; i++) {
        uint8_t wbuf[CHUNK];
        for (lfs3_size_t j = 0; j < CHUNK; j++) {
            wbuf[j] = 'a' + (BENCH_PRNG(&prng) % 26);
        }
        lfs3_file_write(&lfs3, &file, wbuf, CHUNK) => CHUNK;

        // taking too long?
        if (SIM_TIME && BENCH_SIMTIME() >= SIM_TIME) {
            return;
        }
    }
    lfs3_file_close(&lfs3, &file) => 0;

    // reset our timer
    BENCH_SIMRESET();

    // open the file
    BENCH_START("read");
    lfs3_file_open(&lfs3, &file, "bench_random", LFS3_O_RDONLY) => 0;
    uint64_t readed = 0;
    while (!(SIM_SIZE && readed >= (uint64_t)SIM_SIZE)
            && !(SIM_TIME && BENCH_SIMTIME() >= SIM_TIME)) {
        // seek to a random location
        lfs3_off_t pos = BENCH_PRNG(&prng) % SIZE;
        lfs3_file_seek(&lfs3, &file, pos, LFS3_SEEK_SET) => pos;

        // read from the file
        uint8_t rbuf[CHUNK];
        lfs3_ssize_t d = lfs3_file_read(&lfs3, &file, rbuf, CHUNK);
        assert(d <= CHUNK);

        readed += CHUNK;
    }
    lfs3_file_close(&lfs3, &file) => 0;
    // report the amount we managed to read
    BENCH_STOP("read", readed);

    lfs3_unmount(&lfs3) => 0;
'''

# many small file read throughput
[cases.bench_rt_many]
defines.FILE_SIZE = 'CHUNK'
defines.FILE_COUNT = '(SIZE+(FILE_SIZE-1)) / lfs3_max(FILE_SIZE, 1)'
code = '''
    lfs3_t lfs3;
    lfs3_format(&lfs3, LFS3_F_RDWR, CFG) => 0;
    lfs3_mount(&lfs3, LFS3_M_RDWR, CFG) => 0;
    if (!SKIP_WARMUP) {
        BENCH_PAUSE();
        int err = bench_helpers_warmup(&lfs3);
        if (err) {
            return;
        }
        BENCH_RESUME();
    }
    uint32_t prng = SEED;

    // reset our timer
    BENCH_SIMRESET();

    // create files to read
    for (lfs3_size_t i = 0; i < (SIZE+(CHUNK-1))/CHUNK; i++) {
        char name[256];
        sprintf(name, "bench_%08x", i);
        lfs3_file_t file;
        lfs3_file_open(&lfs3, &file, name,
                LFS3_O_WRONLY | LFS3_O_CREAT | LFS3_O_EXCL) => 0;
        for (lfs3_size_t i = 0; i < (FILE_SIZE+(CHUNK-1))/CHUNK; i++) {
            lfs3_ssize_t d = lfs3_min(CHUNK, FILE_SIZE);
            uint8_t wbuf[CHUNK];
            memset(wbuf, 'a'+(BENCH_PRNG(&prng) % 26), d);
            lfs3_file_write(&lfs3, &file, wbuf, d) => d;

            // taking too long?
            if (SIM_TIME && BENCH_SIMTIME() >= SIM_TIME) {
                return;
            }
        }
        lfs3_file_close(&lfs3, &file) => 0;
    }

    // reset our timer
    BENCH_SIMRESET();

    // open the files
    BENCH_START("read");
    uint64_t readed = 0;
    while (!(SIM_SIZE && readed >= (uint64_t)SIM_SIZE)
            && !(SIM_TIME && BENCH_SIMTIME() >= SIM_TIME)) {
        // choose a random filename
        lfs3_off_t pos = BENCH_PRNG(&prng) % ((SIZE+(CHUNK-1))/CHUNK);
        char name[256];
        sprintf(name, "bench_%08x", pos);
        uint8_t rbuf[CHUNK];

        // read the file
        //
        // note file == CHUNK here, the sum of all files should add up
        // roughly to the benchmark SIZE
        lfs3_file_t file;
        lfs3_file_open(&lfs3, &file, name, LFS3_O_RDONLY) => 0;
        for (lfs3_size_t i = 0; i < (FILE_SIZE+(CHUNK-1))/CHUNK; i++) {
            lfs3_ssize_t d = lfs3_min(CHUNK, FILE_SIZE);
            lfs3_file_read(&lfs3, &file, rbuf, d) => d;
            readed += d;

            // taking too long?
            if (SIM_TIME && BENCH_SIMTIME() >= SIM_TIME) {
                break;
            }
        }
        lfs3_file_close(&lfs3, &file) => 0;
    }
    // report the amount we managed to read
    BENCH_STOP("read", readed);

    lfs3_unmount(&lfs3) => 0;
'''