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Posted to users@trafficserver.apache.org by Mark Moseley <mo...@gmail.com> on 2013/11/22 19:18:48 UTC
Curious about proxy.config.remap.num_remap_threads
I'm looking to deploy ATS in a very busy, remap-heavy reverse proxy
environment. I'll be using a handful of lines of Lua to remap based on an
incoming header.
The new proxy.config.remap.num_remap_threads option sounds like it'd be
pretty important to set for such a scenario.
Could the devs chime in on what would be an appropriate # for this setting?
Should 1 suffice? Should it be equal to # of cores? Or something much
higher?
Re: Curious about proxy.config.remap.num_remap_threads
Posted by Leif Hedstrom <zw...@apache.org>.
> On Nov 23, 2013, at 12:13 AM, Mark Moseley <mo...@gmail.com> wrote:
>
>> On Fri, Nov 22, 2013 at 7:51 PM, Leif Hedstrom <zw...@apache.org> wrote:
>>
>> On Nov 22, 2013, at 11:18 AM, Mark Moseley <mo...@gmail.com> wrote:
>>
>> > I'm looking to deploy ATS in a very busy, remap-heavy reverse proxy environment. I'll be using a handful of lines of Lua to remap based on an incoming header.
>> >
>> > The new proxy.config.remap.num_remap_threads option sounds like it'd be pretty important to set for such a scenario.
>> >
>> > Could the devs chime in on what would be an appropriate # for this setting?
>> >
>> > Should 1 suffice? Should it be equal to # of cores? Or something much higher?
>>
>>
>> The only use case I think think of for the remap threads feature is if you have a plugin that can block a thread. With block, I mean, not yield it in some reasonable amount of milliseconds. For now, if you use this remap threads processor, you also have to turn off the per thread sharing of sessions, and switch to a single global session pool.
>
>
> Ok, so it sounds like if something isn't blocking, then there's no need to set it at all then. My Lua code is just doing some munging on the original destination IP, so should never block. Sound right?
Right.
-- Leif
Re: Curious about proxy.config.remap.num_remap_threads
Posted by Mark Moseley <mo...@gmail.com>.
On Fri, Nov 22, 2013 at 7:51 PM, Leif Hedstrom <zw...@apache.org> wrote:
>
> On Nov 22, 2013, at 11:18 AM, Mark Moseley <mo...@gmail.com> wrote:
>
> > I'm looking to deploy ATS in a very busy, remap-heavy reverse proxy
> environment. I'll be using a handful of lines of Lua to remap based on an
> incoming header.
> >
> > The new proxy.config.remap.num_remap_threads option sounds like it'd be
> pretty important to set for such a scenario.
> >
> > Could the devs chime in on what would be an appropriate # for this
> setting?
> >
> > Should 1 suffice? Should it be equal to # of cores? Or something much
> higher?
>
>
> The only use case I think think of for the remap threads feature is if you
> have a plugin that can block a thread. With block, I mean, not yield it in
> some reasonable amount of milliseconds. For now, if you use this remap
> threads processor, you also have to turn off the per thread sharing of
> sessions, and switch to a single global session pool.
>
Ok, so it sounds like if something isn't blocking, then there's no need to
set it at all then. My Lua code is just doing some munging on the original
destination IP, so should never block. Sound right?
Re: Curious about proxy.config.remap.num_remap_threads
Posted by Leif Hedstrom <zw...@apache.org>.
On Nov 22, 2013, at 11:18 AM, Mark Moseley <mo...@gmail.com> wrote:
> I'm looking to deploy ATS in a very busy, remap-heavy reverse proxy environment. I'll be using a handful of lines of Lua to remap based on an incoming header.
>
> The new proxy.config.remap.num_remap_threads option sounds like it'd be pretty important to set for such a scenario.
>
> Could the devs chime in on what would be an appropriate # for this setting?
>
> Should 1 suffice? Should it be equal to # of cores? Or something much higher?
The only use case I think think of for the remap threads feature is if you have a plugin that can block a thread. With block, I mean, not yield it in some reasonable amount of milliseconds. For now, if you use this remap threads processor, you also have to turn off the per thread sharing of sessions, and switch to a single global session pool.
— Leif