Author hughsw
Recipients gregory.p.smith, hughsw, pitrou
Date 2010-06-02.15:32:27
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Message-id <1275492749.57.0.0370658207184.issue8873@psf.upfronthosting.co.za>
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OK.  Using bufsize=4096 or bufsize=-1 eliminates the CPU-hogging problem on Mac OS X.  Thank you.

I have to say that the Popen() doc could be better.  It says: "bufsize, if given, has the same meaning as the corresponding argument to the built-in open() function!" which implies behavior like open(), which is to use the system's default buffering, generally a good thing.

I think the default of 0, meaning unbuffered, is a poor choice.  I'm guessing many many Mac users are getting a big slowdown from this default behavior (as I've now discovered elsewhere in our project!).  I request that you change the default to be the same as open(), i.e. use the system default.

Barring that semantic change, please add a note to the doc:  "Most users will want to set bufsize=4096 for pipe-like buffering, or bufsize=1 for line-based buffering."  

Thanks again for the quick response and resolution.

-Hugh
History
Date User Action Args
2010-06-02 15:32:29hughswsetrecipients: + hughsw, gregory.p.smith, pitrou
2010-06-02 15:32:29hughswsetmessageid: <1275492749.57.0.0370658207184.issue8873@psf.upfronthosting.co.za>
2010-06-02 15:32:28hughswlinkissue8873 messages
2010-06-02 15:32:27hughswcreate