Issue 32383: subprocess.Popen() is slower than subprocess.run() (original) (raw)
Issue32383
Created on 2017-12-20 09:57 by Николай Соколов, last changed 2022-04-11 14:58 by admin. This issue is now closed.
| Messages (2) | ||
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| msg308711 - (view) | Author: Николай Соколов (Николай Соколов) | Date: 2017-12-20 09:57 |
| Hello. I noticed different speed of application, which was execute with subprocess.Popen() and subprocess.run(). I tested on Linux Ubuntu 17.04 and Windows 10. My command line is: "ffmpeg -i big_buck_bunny_480p_surround-fix.avi -f null -" you can use any video file on your PC. I used ffmpeg (open source encoder/decoder/and etc.), but you can use any applications, which counts himself speed of work. I got a difference in speed: Using by terminal: fps=4402 (frame per second); Using by run(): fps=4019; Using by Popen(): fps=3431; On Windows is difference about 5% percent, on Linux about 10% percent. I did not use additional flags. All by default. I downloaded video stream here https://peach.blender.org/download/ | ||
| msg308724 - (view) | Author: Николай Соколов (Николай Соколов) | Date: 2017-12-20 11:33 |
| I incorrectly used the loop to check if the process is alive: while process.poll() is None: pass else: stdout, stderr = process.communicate() |
| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:55 | admin | set | github: 76564 |
| 2017-12-20 11:33:51 | Николай Соколов | set | status: open -> closedresolution: not a bugmessages: + stage: resolved |
| 2017-12-20 09:57:21 | Николай Соколов | create |