Write by logging.FileHandler to one file by many processess

[Guest]

Hello.

As I saw in logging source - there is no lock per file during making emit()
(only lock per thread).

So, my question is - is it safe to log into one file using many processess
uses logging logger?

Cheers,

 

[Alexandre Badez]

Hello.

As I saw in logging source - there is no lock per file during making emit()
(only lock per thread).

So, my question is - is it safe to log into one file using many processess
uses logging logger?

Cheers,

Well, there a dummy response: there is no true thread in Python (I
mean CPython). So there is no problems in this case (cf global
interpreter lock or GIL).

 

[Diez B. Roggisch]

Well, there a dummy response: there is no true thread in Python (I
mean CPython). So there is no problems in this case (cf global
interpreter lock or GIL).

You didn't read the statement of the OP - he explicitly doesn't ask about
threads, but multiple processes writing to one file.

I presume things get messed up... but I don't know for sure.

Diez

 

[Gabriel Genellina]

I presume things get messed up... but I don't know for sure.

Yes, output from several processes comes horribly mixed...
I've avoided it using separate log files for each process; but if that's
not possible, one could try using syslog or a SocketHandler and a separate
listening process.

 

[Vinay Sajip]

Yes, output from several processes comes horribly mixed...
I've avoided it using separate log files for each process; but if that's
not possible, one could try using syslog or a SocketHandler and a separate
listening process.

The Python logging docs even contain a working example of such a
listening process (receiver):

http://www.python.org/doc/current/lib/network-logging.html

Regards,

Vinay Sajip

 

[Gabriel Genellina]

The Python logging docs even contain a working example of such a
listening process (receiver):

http://www.python.org/doc/current/lib/network-logging.html

Great!