[Python-Dev] very bad network performance

Ralf Schmitt schmir at gmail.com
Tue Apr 22 08:44:48 CEST 2008

On Mon, Apr 21, 2008 at 8:10 PM, Gregory P. Smith <greg at krypto.org> wrote:

> The 64K hunch is wrong.  The system limit can be found using
> getsockopt(...SO_RCVBUF...).  It can easily be (and often is) set to many
> megabytes either at a system default level or on a per socket level by the
> user using setsockopt.  When the system default is that large, limiting by
> the system limit would not help the 10mb read case.

but it would help in the 100mb read case.

> Even smaller allocations like 64K cause problems as mentioned in issue
> 1092502 linking to this twisted http://twistedmatrix.com/trac/ticket/1079bug.  twisted's solution was to make the string object returned by a recv as
> short lived as possible by copying it into a StringIO.  We could do the same
> in _fileobject.read() and readline().

this approach look reasonable to me.

- Ralf
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