Each table row shows performance measurements for this Python 3 program with a particular command-line input value N.
N | CPU secs | Elapsed secs | Memory KB | Code B | ≈ CPU Load |
---|---|---|---|---|---|
1 | 3.38 | 3.39 | 8,140 | 367 | 51% 26% 22% 19% 76% 17% 18% 16% |
Read the ↓ make, command line, and program output logs to see how this program was run.
Read iobench benchmark to see what this program should do.
Python 3.3.1 (default, Apr 11 2013, 12:45:45) [GCC 4.7.2] on linux
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)
Thu, 03 Dec 2020 23:04:51 GMT COMMAND LINE: /usr/bin/python3 iobench.python3 1 PROGRAM OUTPUT NOT CHECKED: <function fread at 0x7f88cbf51ee0> 100 bytes, 0.40us per write <function fwrite at 0x7f88cbf51e50> 100 bytes, 0.38us per write <function fread at 0x7f88cbf51ee0> 1000 bytes, 0.58us per write <function fwrite at 0x7f88cbf51e50> 1000 bytes, 0.48us per write <function fread at 0x7f88cbf51ee0> 10000 bytes, 0.86us per write <function fwrite at 0x7f88cbf51e50> 10000 bytes, 0.47us per write <function file_read at 0x7f88cbf64040> 100 bytes, 0.12us per write <function file_write at 0x7f88cbf51f70> 100 bytes, 0.11us per write <function file_read at 0x7f88cbf64040> 1000 bytes, 0.52us per write <function file_write at 0x7f88cbf51f70> 1000 bytes, 0.27us per write <function file_read at 0x7f88cbf64040> 10000 bytes, 3.04us per write <function file_write at 0x7f88cbf51f70> 10000 bytes, 0.82us per write