[stgt] [PATCH 1/1] Allow setting number of threads from commandline

[ronnie sahlberg]

For certain workloads, when/if the entire lun fits in page-cache you
get better performance with only one single worker thread than
multiple ones.
This eliminates the context switching and bouncing between cores on a
many-cores machine.

So for certain workloads I want to use only one worker thread, and
this parameter would allow me to do so without compiling up a separate
version of tgtd.


For these workloads, the single thread used to drive the eventsystem
quickly becomes a bottleneck which is why I will also follow up with
additional patches to make the portal address and the port
configurable, to allow running multiple tgtd's on one system. One
instance for each core, or pair of cores.


regards
ronnie sahlberg


On Tue, Sep 22, 2009 at 3:35 PM, Tomasz Chmielewski <mangoo at wpkg.org> wrote:
> ronnie sahlberg wrote:
>>
>> Hi,
>>
>> Please find attached a patch that removes the hardcoded number of
>> threads and allows setting the number of worker threads from the
>> commandline using the new arguments -t/--threads .
>> The default value for number of threads, if -t/--threads are not
>> specified, is 4, to match the behaviour of tgtd before this patch.
>
> In what usage scenarios can be this option useful?
>
>
> --
> Tomasz Chmielewski
> http://wpkg.org
>
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