Each table row shows performance measurements for this program with a particular command-line input value N.
N | CPU secs | Elapsed secs | Memory KB | Code B | ≈ CPU Load |
---|---|---|---|---|---|
1 | 5.29 | 5.29 | 74,204 | 367 | 100% 0% 0% 1% 0% 0% 2% 0% |
Read the ↓ make, command line, and program output logs to see how this program was run.
Read benchmark to see what this program should do.
import os, time def measure(func, repetitions, size): t0 = time.time() func(repetitions, size) print( func, "%d bytes, %.2fus per write" % ( size, (time.time() - t0) / repetitions * 1000 * 1000 ) ) def fwrite(repetitions, size): fd = os.open("/dev/null", os.O_WRONLY) for i in range(repetitions): os.write(fd, b" " * size) def fread(repetitions, size): fd = os.open("/dev/full", os.O_RDONLY) for i in range(repetitions): os.read(fd, size) def file_write(repetitions, size): f = open("/dev/null", "w") for i in range(repetitions): f.write(" " * size) f.flush() def file_read(repetitions, size): f = open("/dev/full") for i in range(repetitions): f.read(size) if __name__ == '__main__': measure(fread, 1000000, 100) measure(fwrite, 1000000, 100) measure(fread, 1000000, 1000) measure(fwrite, 1000000, 1000) measure(fread, 100000, 10000) measure(fwrite, 100000, 10000) measure(file_read, 1000000, 100) measure(file_write, 1000000, 100) measure(file_read, 1000000, 1000) measure(file_write, 1000000, 1000) measure(file_read, 100000, 10000) measure(file_write, 100000, 10000)
Fri, 09 Sep 2022 06:01:33 GMT COMMAND LINE: /usr/bin/pypy3 iobench.pypy3 1 PROGRAM OUTPUT NOT CHECKED: <function fread at 0x00007f132914d7e0> 100 bytes, 0.27us per write <function fwrite at 0x00007f132914dba0> 100 bytes, 0.18us per write <function fread at 0x00007f132914d7e0> 1000 bytes, 0.31us per write <function fwrite at 0x00007f132914dba0> 1000 bytes, 0.18us per write <function fread at 0x00007f132914d7e0> 10000 bytes, 0.77us per write <function fwrite at 0x00007f132914dba0> 10000 bytes, 0.18us per write <function file_read at 0x00007f132914dce0> 100 bytes, 0.23us per write <function file_write at 0x00007f132914dc40> 100 bytes, 0.02us per write <function file_read at 0x00007f132914dce0> 1000 bytes, 2.01us per write <function file_write at 0x00007f132914dc40> 1000 bytes, 0.10us per write <function file_read at 0x00007f132914dce0> 10000 bytes, 17.25us per write <function file_write at 0x00007f132914dc40> 10000 bytes, 0.96us per write