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rand: add PRNG.fill_buffer_from_set/2 (#21037)
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Original file line number | Diff line number | Diff line change |
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import os | ||
import rand | ||
import time | ||
import rand.pcg32 | ||
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const buf_len = os.getenv_opt('BUF_LEN') or { '100_000_000' }.int() | ||
const nthreads = os.getenv_opt('VJOBS') or { '2' }.int() | ||
const max_iterations = os.getenv_opt('MAX_ITERATIONS') or { '4' }.int() | ||
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fn main() { | ||
mut buf := []u8{len: buf_len} | ||
mut arr := []thread{} | ||
sw := time.new_stopwatch() | ||
for i in 0 .. nthreads { | ||
part_len := buf.len / nthreads | ||
start := i * part_len | ||
mut chunk := &WorkChunk{ | ||
thread_id: i | ||
// make the last thread fill the remaining characters too: | ||
part: unsafe { buf[start..if i == nthreads - 1 { buf.len } else { start + part_len }] } | ||
} | ||
arr << spawn worker(mut chunk) | ||
} | ||
arr.wait() | ||
elapsed := sw.elapsed().milliseconds() | ||
mut histogram := []u64{len: 58} | ||
for b in buf { | ||
histogram[b]++ | ||
} | ||
println(' buf: ${buf#[..10]} ... ${buf#[-10..]}') | ||
println(' histogram: ${histogram#[48..]}') | ||
println('Total took ${elapsed:6}ms, VJOBS: ${nthreads:2}, MAX_ITERATIONS: ${max_iterations:5}, BUF_LEN: ${buf_len:6}') | ||
println('') | ||
} | ||
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struct WorkChunk { | ||
thread_id int | ||
mut: | ||
part []u8 | ||
} | ||
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const charset = '0123456789' | ||
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fn worker(mut chunk WorkChunk) { | ||
mut rng := rand.PRNG(pcg32.PCG32RNG{}) | ||
sw := time.new_stopwatch() | ||
for _ in 0 .. max_iterations { | ||
rng.fill_buffer_from_set(charset, mut chunk.part) | ||
} | ||
elapsed_time_ns := sw.elapsed().nanoseconds() | ||
fill_ms := u64(f64(elapsed_time_ns) / f64(max_iterations * 1_000_000)) | ||
rand_character_ns := f64(elapsed_time_ns) / f64(max_iterations * chunk.part.len) | ||
println(' thread ${chunk.thread_id:2}, took ${elapsed_time_ns / 1_000_000:6}ms, per fill: ${fill_ms:6}ms, per character: ${rand_character_ns:5.0}ns, part: ${chunk.part#[..3]}...${chunk.part#[-3..]}, part.len: ${chunk.part.len:6}') | ||
} |