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Posted to users@trafficserver.apache.org by Noam Schiff <no...@gmail.com> on 2013/08/07 16:14:53 UTC
Only 1 core is utilized
Hi,
I'm running thousands of transactions per seconds through the trafficserver
but I apperantly only 1 core is really working hard while all the other are
pretty idle.
I saw the process ET_NET_0 consumes around 70 of the CPU (which I assume
that this process is being handled by the only core who actually working
hard).
My question is how can I make the trafficserver uses more cores (I assume
that I need to create more process like this...maybe ET_NET_1, ET_NET_2???)
I changed the below line from 2 to 8 in "records.config" file but it
doesn't do the trick:
CONFIG proxy.config.exec_thread.limit INT 8 (the default is 2)
Any thoughts?
Re: Only 1 core is utilized
Posted by John Plevyak <jp...@gmail.com>.
I have seen this before with networking on Xen. Basically, the ethernet
nic interrupts are pinned to a single CPU. This is typically a problem
with the way the driver interacts with the hardware. ATS is spreading the
load, but because most of the work is in TCP/IP and packet processing, the
single CPU context handling those functions is the bottleneck. The other
CPUs are all mostly idle because they are sharing the other 50% of the work
between them.
On Wed, Aug 7, 2013 at 8:41 AM, Brian Geffon <br...@gmail.com> wrote:
> Interesting, traffic server creates a ton of threads so it should
> definitely distribute across cores unless there is something forcing
> affinity.
>
> On Aug 7, 2013, at 8:34 AM, Noam Schiff <no...@gmail.com> wrote:
>
> It's not that I see only 1 core on top, I see 8 but only 1 is utilized
> On Aug 7, 2013 6:30 PM, "Brian Geffon" <br...@gmail.com> wrote:
>
>> Try Shift + H in top.
>>
>> Brian
>>
>> On Aug 7, 2013, at 7:14 AM, Noam Schiff <no...@gmail.com> wrote:
>>
>> > Hi,
>> >
>> > I'm running thousands of transactions per seconds through the
>> trafficserver but I apperantly only 1 core is really working hard while all
>> the other are pretty idle.
>> > I saw the process ET_NET_0 consumes around 70 of the CPU (which I
>> assume that this process is being handled by the only core who actually
>> working hard).
>> >
>> > My question is how can I make the trafficserver uses more cores (I
>> assume that I need to create more process like this...maybe ET_NET_1,
>> ET_NET_2???)
>> >
>> > I changed the below line from 2 to 8 in "records.config" file but it
>> doesn't do the trick:
>> > CONFIG proxy.config.exec_thread.limit INT 8 (the default is 2)
>> >
>> > Any thoughts?
>>
>
Re: Only 1 core is utilized
Posted by Brian Geffon <br...@gmail.com>.
Interesting, traffic server creates a ton of threads so it should definitely distribute across cores unless there is something forcing affinity.
On Aug 7, 2013, at 8:34 AM, Noam Schiff <no...@gmail.com> wrote:
> It's not that I see only 1 core on top, I see 8 but only 1 is utilized
>
> On Aug 7, 2013 6:30 PM, "Brian Geffon" <br...@gmail.com> wrote:
>> Try Shift + H in top.
>>
>> Brian
>>
>> On Aug 7, 2013, at 7:14 AM, Noam Schiff <no...@gmail.com> wrote:
>>
>> > Hi,
>> >
>> > I'm running thousands of transactions per seconds through the trafficserver but I apperantly only 1 core is really working hard while all the other are pretty idle.
>> > I saw the process ET_NET_0 consumes around 70 of the CPU (which I assume that this process is being handled by the only core who actually working hard).
>> >
>> > My question is how can I make the trafficserver uses more cores (I assume that I need to create more process like this...maybe ET_NET_1, ET_NET_2???)
>> >
>> > I changed the below line from 2 to 8 in "records.config" file but it doesn't do the trick:
>> > CONFIG proxy.config.exec_thread.limit INT 8 (the default is 2)
>> >
>> > Any thoughts?
Re: Only 1 core is utilized
Posted by Noam Schiff <no...@gmail.com>.
It's not that I see only 1 core on top, I see 8 but only 1 is utilized
On Aug 7, 2013 6:30 PM, "Brian Geffon" <br...@gmail.com> wrote:
> Try Shift + H in top.
>
> Brian
>
> On Aug 7, 2013, at 7:14 AM, Noam Schiff <no...@gmail.com> wrote:
>
> > Hi,
> >
> > I'm running thousands of transactions per seconds through the
> trafficserver but I apperantly only 1 core is really working hard while all
> the other are pretty idle.
> > I saw the process ET_NET_0 consumes around 70 of the CPU (which I assume
> that this process is being handled by the only core who actually working
> hard).
> >
> > My question is how can I make the trafficserver uses more cores (I
> assume that I need to create more process like this...maybe ET_NET_1,
> ET_NET_2???)
> >
> > I changed the below line from 2 to 8 in "records.config" file but it
> doesn't do the trick:
> > CONFIG proxy.config.exec_thread.limit INT 8 (the default is 2)
> >
> > Any thoughts?
>
Re: Only 1 core is utilized
Posted by Brian Geffon <br...@gmail.com>.
Try Shift + H in top.
Brian
On Aug 7, 2013, at 7:14 AM, Noam Schiff <no...@gmail.com> wrote:
> Hi,
>
> I'm running thousands of transactions per seconds through the trafficserver but I apperantly only 1 core is really working hard while all the other are pretty idle.
> I saw the process ET_NET_0 consumes around 70 of the CPU (which I assume that this process is being handled by the only core who actually working hard).
>
> My question is how can I make the trafficserver uses more cores (I assume that I need to create more process like this...maybe ET_NET_1, ET_NET_2???)
>
> I changed the below line from 2 to 8 in "records.config" file but it doesn't do the trick:
> CONFIG proxy.config.exec_thread.limit INT 8 (the default is 2)
>
> Any thoughts?
Re: Only 1 core is utilized
Posted by Leif Hedstrom <zw...@apache.org>.
On Aug 7, 2013, at 8:14 AM, Noam Schiff <no...@gmail.com> wrote:
> Hi,
>
>
>
> I changed the below line from 2 to 8 in "records.config" file but it doesn't do the trick:
> CONFIG proxy.config.exec_thread.limit INT 8 (the default is 2)
Besides the other suggestions re: NIC driver pinning a CPU, note that the above alone doesn't change the number of threads created. By default, it autoscales the number of threads based on number of CPUs (it's a multiplier). To set an explicit number of threads (to e.g. 8) you have to do
CONFIG proxy.config.exec_thread.autoconfig INT 0
CONFIG proxy.config.exec_thread.limit INT 8
-- leif
RE: Only 1 core is utilized
Posted by "Eagen, Dave" <Da...@biworldwide.com>.
As I understand it that process is the kernel process for the Ethernet interface. It's not traffic-server. You may need to investigate splitting the traffic between two interfaces.
From: Noam Schiff [mailto:noamschiff@gmail.com]
Sent: Wednesday, August 07, 2013 9:15 AM
To: users@trafficserver.apache.org
Subject: Only 1 core is utilized
Hi,
I'm running thousands of transactions per seconds through the trafficserver but I apperantly only 1 core is really working hard while all the other are pretty idle.
I saw the process ET_NET_0 consumes around 70 of the CPU (which I assume that this process is being handled by the only core who actually working hard).
My question is how can I make the trafficserver uses more cores (I assume that I need to create more process like this...maybe ET_NET_1, ET_NET_2???)
I changed the below line from 2 to 8 in "records.config" file but it doesn't do the trick:
CONFIG proxy.config.exec_thread.limit INT 8 (the default is 2)
Any thoughts?
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