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Re: [xsl] xsl:for-each-group using multiple threads?


Subject: Re: [xsl] xsl:for-each-group using multiple threads?
From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 27 Jan 2015 10:54:38 -0000

Multi-threading is never cheap, because of the amount of testing needed to get
it right, and the cost of diagnosing bugs. Come to XML Prague in February
where I am speaking on the topic...

But yes, it would be nice. And I've recently made changes to implement some of
the multi-threading support in a more generic way, which might make the code
more reusable.

A really good implementation of multi-threaded grouping would not only process
the groups in parallel with each other, it would process a group in parallel
with building the group, at least in the case where the processing is
streamed. But streamed grouping is pretty hairy already, streamed
multi-threaded grouping is the stuff of sleepless nights.

Michael Kay
Saxonica
mike@xxxxxxxxxxxx
+44 (0) 118 946 5893




On 27 Jan 2015, at 10:20, Marc Kupietz kupietz@xxxxxxxxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> Unfortunately, xsl:for-each-group does not seem to support the
> saxon:threads attribute. Can anyone think of a workaround to split the
> processing of groups among multiple threads without causing a lot of
> overhead?
>
> If there is no such workaround, wouldn't it be a nice (and cheap?)
> feature to add saxon:threads support to xsl:for-each-group?
> I think such a feature would in many applications allow for a better
> control over the thread-overhead/work ratio when using multiple
> threads.
>
> Marc


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