subprocess.Popen strange bhaviour

2012-01-18 Thread Mac Smith 
Hi,

I am using subprocess.Popen to start a movie ripping command HandBrakeCLI. My 
server is 64bit ubuntu server and has 8 cores. When the command starts it uses 
all 8 cores upto 80%-100% and works fine, but after 270 seconds the cpu usage 
of all the cores drops to 0% - 1%. I tried this many time this happens exactly 
after 270 seconds. Is there some predefined timeout??

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Mac
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Re: subprocess.Popen strange bhaviour

2012-01-18 Thread Steven D'Aprano 
On Wed, 18 Jan 2012 14:44:37 +0530, Mac Smith wrote:

 Hi,
 
 I am using subprocess.Popen to start a movie ripping command
 HandBrakeCLI. My server is 64bit ubuntu server and has 8 cores. When the
 command starts it uses all 8 cores upto 80%-100% and works fine, but
 after 270 seconds the cpu usage of all the cores drops to 0% - 1%. I
 tried this many time this happens exactly after 270 seconds. Is there
 some predefined timeout??

I think you have misunderstood subprocess.Popen. It launches the new 
process (HandBrakeCLI) then what happens in that new process is 
independent of Python and Popen.

How are you calling HandBrakeCLI? Is it ripping directly from a device or 
file, or is it reading from stdin? If reading from stdin, possibly it is 
waiting for more data from you. Or perhaps it has simply finished ripping 
and there's nothing else for it to do and the process ends.


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Steven
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Re: subprocess.Popen strange bhaviour

2012-01-18 Thread Chris Rebert 
On Wed, Jan 18, 2012 at 1:14 AM, Mac Smith macsmith...@gmail.com wrote:
 Hi,

 I am using subprocess.Popen to start a movie ripping command HandBrakeCLI. My 
 server is 64bit ubuntu server and has 8 cores. When the command starts it 
 uses all 8 cores upto 80%-100% and works fine, but after 270 seconds the cpu 
 usage of all the cores drops to 0% - 1%. I tried this many time this happens 
 exactly after 270 seconds. Is there some predefined timeout??

Please post the part of your code that uses subprocess.Popen().

Cheers,
Chris
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