Re: [sched,rcu] 9234566d3a3: +1.6% will-it-scale.scalability, +1302.6% time.involuntary_context_switches
On Tue, Apr 22, 2014 at 10:41:12AM +0800, Jet Chen wrote:
> On 04/22/2014 09:59 AM, Paul E. McKenney wrote:
> >On Mon, Apr 21, 2014 at 02:28:21PM +0800, Jet Chen wrote:
> >>Hi Paul,
> >>
> >>we noticed the below changes on
> >>git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
> >>torture.2014.04.18a
> >>commit 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 ("sched,rcu: Make
> >>cond_resched() report RCU quiescent states")
> >
> >My impression of these statistics is that this commit results in huge
> >numbers of additional context switches and interrupts, but has a slightly
> >positive effect on performance and a larger negative effect on
> >scalability.
> >
> >Is this a reasonable interpretation?
> >
> Yes, you're right.
OK, sounds like a bit of rework is in order, then...
Thanx, Paul
> >>Comparison 1 - parent commit of 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 vs
> >>9234566d3a36c0aead8852e3c2ca94cd8ebfe219
> >>
> >>e119454e74a852f 9234566d3a36c0aead8852e3c
> >>--- -
> >> 1035948 ~ 0% +1.6%1052990 ~ 0% TOTAL
> >> will-it-scale.per_thread_ops
> >> 1271322 ~ 0% +1.8%1294004 ~ 0% TOTAL
> >> will-it-scale.per_process_ops
> >>0.63 ~ 0% -5.2% 0.60 ~ 0% TOTAL
> >> will-it-scale.scalability
> >> 22470 ~ 2% +1302.6% 315168 ~ 2% TOTAL
> >> time.involuntary_context_switches
> >> 84265 ~ 5% +1047.1% 966581 ~ 1% TOTAL interrupts.IWI
> >>1828 ~44%+189.6% 5295 ~13% TOTAL
> >> time.voluntary_context_switches
> >>5337 ~ 1% +82.1% 9720 ~ 1% TOTAL vmstat.system.cs
> >> 118599 ~ 0% -30.4% 82545 ~ 0% TOTAL
> >> interrupts.0:IO-APIC-edge.timer
> >> 224021 ~ 4% +34.7% 301858 ~ 2% TOTAL interrupts.RES
> >> 25148 ~ 0% +7.0% 26917 ~ 0% TOTAL vmstat.system.in
> >> 7063439 ~ 0% -5.2%6694536 ~ 0% TOTAL interrupts.LOC
> >> 188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.NMI
> >> 188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.PMI
> >>3720 ~ 0% -1.5% 3665 ~ 0% TOTAL time.system_time
> >>1215 ~ 0% -1.4% 1198 ~ 0% TOTAL
> >> time.percent_of_cpu_this_job_got
> >>
> >>
> >>Comparison 2 - b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs
> >>9234566d3a36c0aead8852e3c2ca94cd8ebfe219
> >>
> >>Fengguang has reported stats changes about
> >>b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 to you days ago.
> >>git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
> >>dev.2014.04.14a
> >>commit b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 ("sched,rcu: Make
> >>cond_resched() report RCU quiescent states")
> >>
> >>Let's have a compare here.
> >>
> >>b84c4e08143c98d 9234566d3a36c0aead8852e3c
> >>--- -
> >> 809309 ~ 0% -2.6% 788400 ~ 0% TOTAL
> >> will-it-scale.per_process_ops
> >>0.61 ~ 0% -1.9% 0.60 ~ 0% TOTAL
> >> will-it-scale.scalability
> >> 434080 ~ 0% -1.5% 427643 ~ 0% TOTAL
> >> will-it-scale.per_thread_ops
> >> 4 ~11% +1.2e+05% 5249 ~ 2% TOTAL interrupts.IWI
> >> 607 ~ 7% +28.0%778 ~14% TOTAL
> >> interrupts.47:PCI-MSI-edge.eth0
> >> 12349 ~ 2% -14.6% 10548 ~ 1% TOTAL
> >> interrupts.0:IO-APIC-edge.timer
> >>3078 ~ 3% +20.9% 3722 ~ 6% TOTAL interrupts.RES
> >>
> >>
> >>Comparison 3 - parent commit of b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs
> >>b84c4e08143c98dad4b4d139f08db0b98b0d3ec4
> >>
> >>Duplicated with Fengguang's report. Help you to see these info in a page :)
> >>
> >>ad86a04266f9b49 b84c4e08143c98dad4b4d139f
> >>--- -
> >> 676264 ~ 0% +3.3% 698461 ~ 0% TOTAL
> >> will-it-scale.per_thread_ops
> >> 1174547 ~ 0% +3.0%1209307 ~ 0% TOTAL
> >> will-it-scale.per_process_ops
> >>1.67 ~ 0% -2.3% 1.63 ~ 0% TOTAL
> >> will-it-scale.scalability
> >> 10522 ~ 2%+921.2% 107463 ~ 1% TOTAL
> >> time.involuntary_context_switches
> >> 77671 ~ 3% +67.0% 129688 ~ 3% TOTAL interrupts.RES
> >> 99502 ~ 0% -27.8% 71813 ~ 0% TOTAL
> >> interrupts.0:IO-APIC-edge.timer
> >>2554 ~ 0% +49.1% 3809 ~ 1% TOTAL vmstat.system.cs
> >> 11524 ~ 0% -2.3% 11259 ~ 0% TOTAL vmstat.system.in
> >> 213 ~ 0% -4.3%204 ~ 0% TOTAL time.system_time
> >> 74 ~ 0% -4.1% 71 ~ 0% TOTAL
> >> time.percent_of_cpu_this_job_got
> >> 3495099 ~ 0% -3.1%3387173 ~ 0% TOTAL interrupts.LOC
> >>
> >>
> >>
> >>
> >>Thanks,
> >>Jet
> >>
> >>
> >>
> >
> >>./runtest.py open2 32 1 4 6 8
> >>
> >>
> >
>
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Re: [sched,rcu] 9234566d3a3: +1.6% will-it-scale.scalability, +1302.6% time.involuntary_context_switches
On Tue, Apr 22, 2014 at 10:41:12AM +0800, Jet Chen wrote: On 04/22/2014 09:59 AM, Paul E. McKenney wrote: On Mon, Apr 21, 2014 at 02:28:21PM +0800, Jet Chen wrote: Hi Paul, we noticed the below changes on git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git torture.2014.04.18a commit 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 (sched,rcu: Make cond_resched() report RCU quiescent states) My impression of these statistics is that this commit results in huge numbers of additional context switches and interrupts, but has a slightly positive effect on performance and a larger negative effect on scalability. Is this a reasonable interpretation? Yes, you're right. OK, sounds like a bit of rework is in order, then... Thanx, Paul Comparison 1 - parent commit of 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 vs 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 e119454e74a852f 9234566d3a36c0aead8852e3c --- - 1035948 ~ 0% +1.6%1052990 ~ 0% TOTAL will-it-scale.per_thread_ops 1271322 ~ 0% +1.8%1294004 ~ 0% TOTAL will-it-scale.per_process_ops 0.63 ~ 0% -5.2% 0.60 ~ 0% TOTAL will-it-scale.scalability 22470 ~ 2% +1302.6% 315168 ~ 2% TOTAL time.involuntary_context_switches 84265 ~ 5% +1047.1% 966581 ~ 1% TOTAL interrupts.IWI 1828 ~44%+189.6% 5295 ~13% TOTAL time.voluntary_context_switches 5337 ~ 1% +82.1% 9720 ~ 1% TOTAL vmstat.system.cs 118599 ~ 0% -30.4% 82545 ~ 0% TOTAL interrupts.0:IO-APIC-edge.timer 224021 ~ 4% +34.7% 301858 ~ 2% TOTAL interrupts.RES 25148 ~ 0% +7.0% 26917 ~ 0% TOTAL vmstat.system.in 7063439 ~ 0% -5.2%6694536 ~ 0% TOTAL interrupts.LOC 188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.NMI 188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.PMI 3720 ~ 0% -1.5% 3665 ~ 0% TOTAL time.system_time 1215 ~ 0% -1.4% 1198 ~ 0% TOTAL time.percent_of_cpu_this_job_got Comparison 2 - b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 Fengguang has reported stats changes about b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 to you days ago. git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2014.04.14a commit b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 (sched,rcu: Make cond_resched() report RCU quiescent states) Let's have a compare here. b84c4e08143c98d 9234566d3a36c0aead8852e3c --- - 809309 ~ 0% -2.6% 788400 ~ 0% TOTAL will-it-scale.per_process_ops 0.61 ~ 0% -1.9% 0.60 ~ 0% TOTAL will-it-scale.scalability 434080 ~ 0% -1.5% 427643 ~ 0% TOTAL will-it-scale.per_thread_ops 4 ~11% +1.2e+05% 5249 ~ 2% TOTAL interrupts.IWI 607 ~ 7% +28.0%778 ~14% TOTAL interrupts.47:PCI-MSI-edge.eth0 12349 ~ 2% -14.6% 10548 ~ 1% TOTAL interrupts.0:IO-APIC-edge.timer 3078 ~ 3% +20.9% 3722 ~ 6% TOTAL interrupts.RES Comparison 3 - parent commit of b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 Duplicated with Fengguang's report. Help you to see these info in a page :) ad86a04266f9b49 b84c4e08143c98dad4b4d139f --- - 676264 ~ 0% +3.3% 698461 ~ 0% TOTAL will-it-scale.per_thread_ops 1174547 ~ 0% +3.0%1209307 ~ 0% TOTAL will-it-scale.per_process_ops 1.67 ~ 0% -2.3% 1.63 ~ 0% TOTAL will-it-scale.scalability 10522 ~ 2%+921.2% 107463 ~ 1% TOTAL time.involuntary_context_switches 77671 ~ 3% +67.0% 129688 ~ 3% TOTAL interrupts.RES 99502 ~ 0% -27.8% 71813 ~ 0% TOTAL interrupts.0:IO-APIC-edge.timer 2554 ~ 0% +49.1% 3809 ~ 1% TOTAL vmstat.system.cs 11524 ~ 0% -2.3% 11259 ~ 0% TOTAL vmstat.system.in 213 ~ 0% -4.3%204 ~ 0% TOTAL time.system_time 74 ~ 0% -4.1% 71 ~ 0% TOTAL time.percent_of_cpu_this_job_got 3495099 ~ 0% -3.1%3387173 ~ 0% TOTAL interrupts.LOC Thanks, Jet ./runtest.py open2 32 1 4 6 8 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [sched,rcu] 9234566d3a3: +1.6% will-it-scale.scalability, +1302.6% time.involuntary_context_switches
On 04/22/2014 09:59 AM, Paul E. McKenney wrote:
On Mon, Apr 21, 2014 at 02:28:21PM +0800, Jet Chen wrote:
Hi Paul,
we noticed the below changes on
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
torture.2014.04.18a
commit 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 ("sched,rcu: Make cond_resched()
report RCU quiescent states")
My impression of these statistics is that this commit results in huge
numbers of additional context switches and interrupts, but has a slightly
positive effect on performance and a larger negative effect on
scalability.
Is this a reasonable interpretation?
Yes, you're right.
Thanx, Paul
Comparison 1 - parent commit of 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 vs
9234566d3a36c0aead8852e3c2ca94cd8ebfe219
e119454e74a852f 9234566d3a36c0aead8852e3c
--- -
1035948 ~ 0% +1.6%1052990 ~ 0% TOTAL will-it-scale.per_thread_ops
1271322 ~ 0% +1.8%1294004 ~ 0% TOTAL
will-it-scale.per_process_ops
0.63 ~ 0% -5.2% 0.60 ~ 0% TOTAL will-it-scale.scalability
22470 ~ 2% +1302.6% 315168 ~ 2% TOTAL
time.involuntary_context_switches
84265 ~ 5% +1047.1% 966581 ~ 1% TOTAL interrupts.IWI
1828 ~44%+189.6% 5295 ~13% TOTAL
time.voluntary_context_switches
5337 ~ 1% +82.1% 9720 ~ 1% TOTAL vmstat.system.cs
118599 ~ 0% -30.4% 82545 ~ 0% TOTAL
interrupts.0:IO-APIC-edge.timer
224021 ~ 4% +34.7% 301858 ~ 2% TOTAL interrupts.RES
25148 ~ 0% +7.0% 26917 ~ 0% TOTAL vmstat.system.in
7063439 ~ 0% -5.2%6694536 ~ 0% TOTAL interrupts.LOC
188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.NMI
188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.PMI
3720 ~ 0% -1.5% 3665 ~ 0% TOTAL time.system_time
1215 ~ 0% -1.4% 1198 ~ 0% TOTAL
time.percent_of_cpu_this_job_got
Comparison 2 - b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs
9234566d3a36c0aead8852e3c2ca94cd8ebfe219
Fengguang has reported stats changes about
b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 to you days ago.
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
dev.2014.04.14a
commit b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 ("sched,rcu: Make cond_resched()
report RCU quiescent states")
Let's have a compare here.
b84c4e08143c98d 9234566d3a36c0aead8852e3c
--- -
809309 ~ 0% -2.6% 788400 ~ 0% TOTAL
will-it-scale.per_process_ops
0.61 ~ 0% -1.9% 0.60 ~ 0% TOTAL will-it-scale.scalability
434080 ~ 0% -1.5% 427643 ~ 0% TOTAL will-it-scale.per_thread_ops
4 ~11% +1.2e+05% 5249 ~ 2% TOTAL interrupts.IWI
607 ~ 7% +28.0%778 ~14% TOTAL
interrupts.47:PCI-MSI-edge.eth0
12349 ~ 2% -14.6% 10548 ~ 1% TOTAL
interrupts.0:IO-APIC-edge.timer
3078 ~ 3% +20.9% 3722 ~ 6% TOTAL interrupts.RES
Comparison 3 - parent commit of b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs
b84c4e08143c98dad4b4d139f08db0b98b0d3ec4
Duplicated with Fengguang's report. Help you to see these info in a page :)
ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--- -
676264 ~ 0% +3.3% 698461 ~ 0% TOTAL will-it-scale.per_thread_ops
1174547 ~ 0% +3.0%1209307 ~ 0% TOTAL
will-it-scale.per_process_ops
1.67 ~ 0% -2.3% 1.63 ~ 0% TOTAL will-it-scale.scalability
10522 ~ 2%+921.2% 107463 ~ 1% TOTAL
time.involuntary_context_switches
77671 ~ 3% +67.0% 129688 ~ 3% TOTAL interrupts.RES
99502 ~ 0% -27.8% 71813 ~ 0% TOTAL
interrupts.0:IO-APIC-edge.timer
2554 ~ 0% +49.1% 3809 ~ 1% TOTAL vmstat.system.cs
11524 ~ 0% -2.3% 11259 ~ 0% TOTAL vmstat.system.in
213 ~ 0% -4.3%204 ~ 0% TOTAL time.system_time
74 ~ 0% -4.1% 71 ~ 0% TOTAL
time.percent_of_cpu_this_job_got
3495099 ~ 0% -3.1%3387173 ~ 0% TOTAL interrupts.LOC
Thanks,
Jet
./runtest.py open2 32 1 4 6 8
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To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Re: [sched,rcu] 9234566d3a3: +1.6% will-it-scale.scalability, +1302.6% time.involuntary_context_switches
On Mon, Apr 21, 2014 at 02:28:21PM +0800, Jet Chen wrote:
> Hi Paul,
>
> we noticed the below changes on
> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
> torture.2014.04.18a
> commit 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 ("sched,rcu: Make
> cond_resched() report RCU quiescent states")
My impression of these statistics is that this commit results in huge
numbers of additional context switches and interrupts, but has a slightly
positive effect on performance and a larger negative effect on
scalability.
Is this a reasonable interpretation?
Thanx, Paul
> Comparison 1 - parent commit of 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 vs
> 9234566d3a36c0aead8852e3c2ca94cd8ebfe219
>
> e119454e74a852f 9234566d3a36c0aead8852e3c
> --- -
> 1035948 ~ 0% +1.6%1052990 ~ 0% TOTAL
> will-it-scale.per_thread_ops
> 1271322 ~ 0% +1.8%1294004 ~ 0% TOTAL
> will-it-scale.per_process_ops
>0.63 ~ 0% -5.2% 0.60 ~ 0% TOTAL will-it-scale.scalability
> 22470 ~ 2% +1302.6% 315168 ~ 2% TOTAL
> time.involuntary_context_switches
> 84265 ~ 5% +1047.1% 966581 ~ 1% TOTAL interrupts.IWI
>1828 ~44%+189.6% 5295 ~13% TOTAL
> time.voluntary_context_switches
>5337 ~ 1% +82.1% 9720 ~ 1% TOTAL vmstat.system.cs
> 118599 ~ 0% -30.4% 82545 ~ 0% TOTAL
> interrupts.0:IO-APIC-edge.timer
> 224021 ~ 4% +34.7% 301858 ~ 2% TOTAL interrupts.RES
> 25148 ~ 0% +7.0% 26917 ~ 0% TOTAL vmstat.system.in
> 7063439 ~ 0% -5.2%6694536 ~ 0% TOTAL interrupts.LOC
> 188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.NMI
> 188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.PMI
>3720 ~ 0% -1.5% 3665 ~ 0% TOTAL time.system_time
>1215 ~ 0% -1.4% 1198 ~ 0% TOTAL
> time.percent_of_cpu_this_job_got
>
>
> Comparison 2 - b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs
> 9234566d3a36c0aead8852e3c2ca94cd8ebfe219
>
> Fengguang has reported stats changes about
> b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 to you days ago.
> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
> dev.2014.04.14a
> commit b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 ("sched,rcu: Make
> cond_resched() report RCU quiescent states")
>
> Let's have a compare here.
>
> b84c4e08143c98d 9234566d3a36c0aead8852e3c
> --- -
> 809309 ~ 0% -2.6% 788400 ~ 0% TOTAL
> will-it-scale.per_process_ops
>0.61 ~ 0% -1.9% 0.60 ~ 0% TOTAL will-it-scale.scalability
> 434080 ~ 0% -1.5% 427643 ~ 0% TOTAL
> will-it-scale.per_thread_ops
> 4 ~11% +1.2e+05% 5249 ~ 2% TOTAL interrupts.IWI
> 607 ~ 7% +28.0%778 ~14% TOTAL
> interrupts.47:PCI-MSI-edge.eth0
> 12349 ~ 2% -14.6% 10548 ~ 1% TOTAL
> interrupts.0:IO-APIC-edge.timer
>3078 ~ 3% +20.9% 3722 ~ 6% TOTAL interrupts.RES
>
>
> Comparison 3 - parent commit of b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs
> b84c4e08143c98dad4b4d139f08db0b98b0d3ec4
>
> Duplicated with Fengguang's report. Help you to see these info in a page :)
>
> ad86a04266f9b49 b84c4e08143c98dad4b4d139f
> --- -
> 676264 ~ 0% +3.3% 698461 ~ 0% TOTAL
> will-it-scale.per_thread_ops
> 1174547 ~ 0% +3.0%1209307 ~ 0% TOTAL
> will-it-scale.per_process_ops
>1.67 ~ 0% -2.3% 1.63 ~ 0% TOTAL will-it-scale.scalability
> 10522 ~ 2%+921.2% 107463 ~ 1% TOTAL
> time.involuntary_context_switches
> 77671 ~ 3% +67.0% 129688 ~ 3% TOTAL interrupts.RES
> 99502 ~ 0% -27.8% 71813 ~ 0% TOTAL
> interrupts.0:IO-APIC-edge.timer
>2554 ~ 0% +49.1% 3809 ~ 1% TOTAL vmstat.system.cs
> 11524 ~ 0% -2.3% 11259 ~ 0% TOTAL vmstat.system.in
> 213 ~ 0% -4.3%204 ~ 0% TOTAL time.system_time
> 74 ~ 0% -4.1% 71 ~ 0% TOTAL
> time.percent_of_cpu_this_job_got
> 3495099 ~ 0% -3.1%3387173 ~ 0% TOTAL interrupts.LOC
>
>
>
>
> Thanks,
> Jet
>
>
>
> ./runtest.py open2 32 1 4 6 8
>
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[sched,rcu] 9234566d3a3: +1.6% will-it-scale.scalability, +1302.6% time.involuntary_context_switches
Hi Paul,
we noticed the below changes on
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
torture.2014.04.18a
commit 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 ("sched,rcu: Make cond_resched()
report RCU quiescent states")
Comparison 1 - parent commit of 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 vs
9234566d3a36c0aead8852e3c2ca94cd8ebfe219
e119454e74a852f 9234566d3a36c0aead8852e3c
--- -
1035948 ~ 0% +1.6%1052990 ~ 0% TOTAL will-it-scale.per_thread_ops
1271322 ~ 0% +1.8%1294004 ~ 0% TOTAL will-it-scale.per_process_ops
0.63 ~ 0% -5.2% 0.60 ~ 0% TOTAL will-it-scale.scalability
22470 ~ 2% +1302.6% 315168 ~ 2% TOTAL
time.involuntary_context_switches
84265 ~ 5% +1047.1% 966581 ~ 1% TOTAL interrupts.IWI
1828 ~44%+189.6% 5295 ~13% TOTAL
time.voluntary_context_switches
5337 ~ 1% +82.1% 9720 ~ 1% TOTAL vmstat.system.cs
118599 ~ 0% -30.4% 82545 ~ 0% TOTAL
interrupts.0:IO-APIC-edge.timer
224021 ~ 4% +34.7% 301858 ~ 2% TOTAL interrupts.RES
25148 ~ 0% +7.0% 26917 ~ 0% TOTAL vmstat.system.in
7063439 ~ 0% -5.2%6694536 ~ 0% TOTAL interrupts.LOC
188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.NMI
188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.PMI
3720 ~ 0% -1.5% 3665 ~ 0% TOTAL time.system_time
1215 ~ 0% -1.4% 1198 ~ 0% TOTAL
time.percent_of_cpu_this_job_got
Comparison 2 - b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs
9234566d3a36c0aead8852e3c2ca94cd8ebfe219
Fengguang has reported stats changes about
b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 to you days ago.
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
dev.2014.04.14a
commit b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 ("sched,rcu: Make cond_resched()
report RCU quiescent states")
Let's have a compare here.
b84c4e08143c98d 9234566d3a36c0aead8852e3c
--- -
809309 ~ 0% -2.6% 788400 ~ 0% TOTAL will-it-scale.per_process_ops
0.61 ~ 0% -1.9% 0.60 ~ 0% TOTAL will-it-scale.scalability
434080 ~ 0% -1.5% 427643 ~ 0% TOTAL will-it-scale.per_thread_ops
4 ~11% +1.2e+05% 5249 ~ 2% TOTAL interrupts.IWI
607 ~ 7% +28.0%778 ~14% TOTAL
interrupts.47:PCI-MSI-edge.eth0
12349 ~ 2% -14.6% 10548 ~ 1% TOTAL
interrupts.0:IO-APIC-edge.timer
3078 ~ 3% +20.9% 3722 ~ 6% TOTAL interrupts.RES
Comparison 3 - parent commit of b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs
b84c4e08143c98dad4b4d139f08db0b98b0d3ec4
Duplicated with Fengguang's report. Help you to see these info in a page :)
ad86a04266f9b49 b84c4e08143c98dad4b4d139f
--- -
676264 ~ 0% +3.3% 698461 ~ 0% TOTAL will-it-scale.per_thread_ops
1174547 ~ 0% +3.0%1209307 ~ 0% TOTAL will-it-scale.per_process_ops
1.67 ~ 0% -2.3% 1.63 ~ 0% TOTAL will-it-scale.scalability
10522 ~ 2%+921.2% 107463 ~ 1% TOTAL
time.involuntary_context_switches
77671 ~ 3% +67.0% 129688 ~ 3% TOTAL interrupts.RES
99502 ~ 0% -27.8% 71813 ~ 0% TOTAL
interrupts.0:IO-APIC-edge.timer
2554 ~ 0% +49.1% 3809 ~ 1% TOTAL vmstat.system.cs
11524 ~ 0% -2.3% 11259 ~ 0% TOTAL vmstat.system.in
213 ~ 0% -4.3%204 ~ 0% TOTAL time.system_time
74 ~ 0% -4.1% 71 ~ 0% TOTAL
time.percent_of_cpu_this_job_got
3495099 ~ 0% -3.1%3387173 ~ 0% TOTAL interrupts.LOC
Thanks,
Jet
./runtest.py open2 32 1 4 6 8
[sched,rcu] 9234566d3a3: +1.6% will-it-scale.scalability, +1302.6% time.involuntary_context_switches
Hi Paul, we noticed the below changes on git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git torture.2014.04.18a commit 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 (sched,rcu: Make cond_resched() report RCU quiescent states) Comparison 1 - parent commit of 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 vs 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 e119454e74a852f 9234566d3a36c0aead8852e3c --- - 1035948 ~ 0% +1.6%1052990 ~ 0% TOTAL will-it-scale.per_thread_ops 1271322 ~ 0% +1.8%1294004 ~ 0% TOTAL will-it-scale.per_process_ops 0.63 ~ 0% -5.2% 0.60 ~ 0% TOTAL will-it-scale.scalability 22470 ~ 2% +1302.6% 315168 ~ 2% TOTAL time.involuntary_context_switches 84265 ~ 5% +1047.1% 966581 ~ 1% TOTAL interrupts.IWI 1828 ~44%+189.6% 5295 ~13% TOTAL time.voluntary_context_switches 5337 ~ 1% +82.1% 9720 ~ 1% TOTAL vmstat.system.cs 118599 ~ 0% -30.4% 82545 ~ 0% TOTAL interrupts.0:IO-APIC-edge.timer 224021 ~ 4% +34.7% 301858 ~ 2% TOTAL interrupts.RES 25148 ~ 0% +7.0% 26917 ~ 0% TOTAL vmstat.system.in 7063439 ~ 0% -5.2%6694536 ~ 0% TOTAL interrupts.LOC 188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.NMI 188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.PMI 3720 ~ 0% -1.5% 3665 ~ 0% TOTAL time.system_time 1215 ~ 0% -1.4% 1198 ~ 0% TOTAL time.percent_of_cpu_this_job_got Comparison 2 - b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 Fengguang has reported stats changes about b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 to you days ago. git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2014.04.14a commit b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 (sched,rcu: Make cond_resched() report RCU quiescent states) Let's have a compare here. b84c4e08143c98d 9234566d3a36c0aead8852e3c --- - 809309 ~ 0% -2.6% 788400 ~ 0% TOTAL will-it-scale.per_process_ops 0.61 ~ 0% -1.9% 0.60 ~ 0% TOTAL will-it-scale.scalability 434080 ~ 0% -1.5% 427643 ~ 0% TOTAL will-it-scale.per_thread_ops 4 ~11% +1.2e+05% 5249 ~ 2% TOTAL interrupts.IWI 607 ~ 7% +28.0%778 ~14% TOTAL interrupts.47:PCI-MSI-edge.eth0 12349 ~ 2% -14.6% 10548 ~ 1% TOTAL interrupts.0:IO-APIC-edge.timer 3078 ~ 3% +20.9% 3722 ~ 6% TOTAL interrupts.RES Comparison 3 - parent commit of b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 Duplicated with Fengguang's report. Help you to see these info in a page :) ad86a04266f9b49 b84c4e08143c98dad4b4d139f --- - 676264 ~ 0% +3.3% 698461 ~ 0% TOTAL will-it-scale.per_thread_ops 1174547 ~ 0% +3.0%1209307 ~ 0% TOTAL will-it-scale.per_process_ops 1.67 ~ 0% -2.3% 1.63 ~ 0% TOTAL will-it-scale.scalability 10522 ~ 2%+921.2% 107463 ~ 1% TOTAL time.involuntary_context_switches 77671 ~ 3% +67.0% 129688 ~ 3% TOTAL interrupts.RES 99502 ~ 0% -27.8% 71813 ~ 0% TOTAL interrupts.0:IO-APIC-edge.timer 2554 ~ 0% +49.1% 3809 ~ 1% TOTAL vmstat.system.cs 11524 ~ 0% -2.3% 11259 ~ 0% TOTAL vmstat.system.in 213 ~ 0% -4.3%204 ~ 0% TOTAL time.system_time 74 ~ 0% -4.1% 71 ~ 0% TOTAL time.percent_of_cpu_this_job_got 3495099 ~ 0% -3.1%3387173 ~ 0% TOTAL interrupts.LOC Thanks, Jet ./runtest.py open2 32 1 4 6 8
Re: [sched,rcu] 9234566d3a3: +1.6% will-it-scale.scalability, +1302.6% time.involuntary_context_switches
On Mon, Apr 21, 2014 at 02:28:21PM +0800, Jet Chen wrote: Hi Paul, we noticed the below changes on git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git torture.2014.04.18a commit 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 (sched,rcu: Make cond_resched() report RCU quiescent states) My impression of these statistics is that this commit results in huge numbers of additional context switches and interrupts, but has a slightly positive effect on performance and a larger negative effect on scalability. Is this a reasonable interpretation? Thanx, Paul Comparison 1 - parent commit of 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 vs 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 e119454e74a852f 9234566d3a36c0aead8852e3c --- - 1035948 ~ 0% +1.6%1052990 ~ 0% TOTAL will-it-scale.per_thread_ops 1271322 ~ 0% +1.8%1294004 ~ 0% TOTAL will-it-scale.per_process_ops 0.63 ~ 0% -5.2% 0.60 ~ 0% TOTAL will-it-scale.scalability 22470 ~ 2% +1302.6% 315168 ~ 2% TOTAL time.involuntary_context_switches 84265 ~ 5% +1047.1% 966581 ~ 1% TOTAL interrupts.IWI 1828 ~44%+189.6% 5295 ~13% TOTAL time.voluntary_context_switches 5337 ~ 1% +82.1% 9720 ~ 1% TOTAL vmstat.system.cs 118599 ~ 0% -30.4% 82545 ~ 0% TOTAL interrupts.0:IO-APIC-edge.timer 224021 ~ 4% +34.7% 301858 ~ 2% TOTAL interrupts.RES 25148 ~ 0% +7.0% 26917 ~ 0% TOTAL vmstat.system.in 7063439 ~ 0% -5.2%6694536 ~ 0% TOTAL interrupts.LOC 188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.NMI 188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.PMI 3720 ~ 0% -1.5% 3665 ~ 0% TOTAL time.system_time 1215 ~ 0% -1.4% 1198 ~ 0% TOTAL time.percent_of_cpu_this_job_got Comparison 2 - b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 Fengguang has reported stats changes about b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 to you days ago. git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2014.04.14a commit b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 (sched,rcu: Make cond_resched() report RCU quiescent states) Let's have a compare here. b84c4e08143c98d 9234566d3a36c0aead8852e3c --- - 809309 ~ 0% -2.6% 788400 ~ 0% TOTAL will-it-scale.per_process_ops 0.61 ~ 0% -1.9% 0.60 ~ 0% TOTAL will-it-scale.scalability 434080 ~ 0% -1.5% 427643 ~ 0% TOTAL will-it-scale.per_thread_ops 4 ~11% +1.2e+05% 5249 ~ 2% TOTAL interrupts.IWI 607 ~ 7% +28.0%778 ~14% TOTAL interrupts.47:PCI-MSI-edge.eth0 12349 ~ 2% -14.6% 10548 ~ 1% TOTAL interrupts.0:IO-APIC-edge.timer 3078 ~ 3% +20.9% 3722 ~ 6% TOTAL interrupts.RES Comparison 3 - parent commit of b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 Duplicated with Fengguang's report. Help you to see these info in a page :) ad86a04266f9b49 b84c4e08143c98dad4b4d139f --- - 676264 ~ 0% +3.3% 698461 ~ 0% TOTAL will-it-scale.per_thread_ops 1174547 ~ 0% +3.0%1209307 ~ 0% TOTAL will-it-scale.per_process_ops 1.67 ~ 0% -2.3% 1.63 ~ 0% TOTAL will-it-scale.scalability 10522 ~ 2%+921.2% 107463 ~ 1% TOTAL time.involuntary_context_switches 77671 ~ 3% +67.0% 129688 ~ 3% TOTAL interrupts.RES 99502 ~ 0% -27.8% 71813 ~ 0% TOTAL interrupts.0:IO-APIC-edge.timer 2554 ~ 0% +49.1% 3809 ~ 1% TOTAL vmstat.system.cs 11524 ~ 0% -2.3% 11259 ~ 0% TOTAL vmstat.system.in 213 ~ 0% -4.3%204 ~ 0% TOTAL time.system_time 74 ~ 0% -4.1% 71 ~ 0% TOTAL time.percent_of_cpu_this_job_got 3495099 ~ 0% -3.1%3387173 ~ 0% TOTAL interrupts.LOC Thanks, Jet ./runtest.py open2 32 1 4 6 8 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [sched,rcu] 9234566d3a3: +1.6% will-it-scale.scalability, +1302.6% time.involuntary_context_switches
On 04/22/2014 09:59 AM, Paul E. McKenney wrote: On Mon, Apr 21, 2014 at 02:28:21PM +0800, Jet Chen wrote: Hi Paul, we noticed the below changes on git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git torture.2014.04.18a commit 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 (sched,rcu: Make cond_resched() report RCU quiescent states) My impression of these statistics is that this commit results in huge numbers of additional context switches and interrupts, but has a slightly positive effect on performance and a larger negative effect on scalability. Is this a reasonable interpretation? Yes, you're right. Thanx, Paul Comparison 1 - parent commit of 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 vs 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 e119454e74a852f 9234566d3a36c0aead8852e3c --- - 1035948 ~ 0% +1.6%1052990 ~ 0% TOTAL will-it-scale.per_thread_ops 1271322 ~ 0% +1.8%1294004 ~ 0% TOTAL will-it-scale.per_process_ops 0.63 ~ 0% -5.2% 0.60 ~ 0% TOTAL will-it-scale.scalability 22470 ~ 2% +1302.6% 315168 ~ 2% TOTAL time.involuntary_context_switches 84265 ~ 5% +1047.1% 966581 ~ 1% TOTAL interrupts.IWI 1828 ~44%+189.6% 5295 ~13% TOTAL time.voluntary_context_switches 5337 ~ 1% +82.1% 9720 ~ 1% TOTAL vmstat.system.cs 118599 ~ 0% -30.4% 82545 ~ 0% TOTAL interrupts.0:IO-APIC-edge.timer 224021 ~ 4% +34.7% 301858 ~ 2% TOTAL interrupts.RES 25148 ~ 0% +7.0% 26917 ~ 0% TOTAL vmstat.system.in 7063439 ~ 0% -5.2%6694536 ~ 0% TOTAL interrupts.LOC 188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.NMI 188866 ~ 0% -3.1% 183008 ~ 0% TOTAL interrupts.PMI 3720 ~ 0% -1.5% 3665 ~ 0% TOTAL time.system_time 1215 ~ 0% -1.4% 1198 ~ 0% TOTAL time.percent_of_cpu_this_job_got Comparison 2 - b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs 9234566d3a36c0aead8852e3c2ca94cd8ebfe219 Fengguang has reported stats changes about b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 to you days ago. git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2014.04.14a commit b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 (sched,rcu: Make cond_resched() report RCU quiescent states) Let's have a compare here. b84c4e08143c98d 9234566d3a36c0aead8852e3c --- - 809309 ~ 0% -2.6% 788400 ~ 0% TOTAL will-it-scale.per_process_ops 0.61 ~ 0% -1.9% 0.60 ~ 0% TOTAL will-it-scale.scalability 434080 ~ 0% -1.5% 427643 ~ 0% TOTAL will-it-scale.per_thread_ops 4 ~11% +1.2e+05% 5249 ~ 2% TOTAL interrupts.IWI 607 ~ 7% +28.0%778 ~14% TOTAL interrupts.47:PCI-MSI-edge.eth0 12349 ~ 2% -14.6% 10548 ~ 1% TOTAL interrupts.0:IO-APIC-edge.timer 3078 ~ 3% +20.9% 3722 ~ 6% TOTAL interrupts.RES Comparison 3 - parent commit of b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 vs b84c4e08143c98dad4b4d139f08db0b98b0d3ec4 Duplicated with Fengguang's report. Help you to see these info in a page :) ad86a04266f9b49 b84c4e08143c98dad4b4d139f --- - 676264 ~ 0% +3.3% 698461 ~ 0% TOTAL will-it-scale.per_thread_ops 1174547 ~ 0% +3.0%1209307 ~ 0% TOTAL will-it-scale.per_process_ops 1.67 ~ 0% -2.3% 1.63 ~ 0% TOTAL will-it-scale.scalability 10522 ~ 2%+921.2% 107463 ~ 1% TOTAL time.involuntary_context_switches 77671 ~ 3% +67.0% 129688 ~ 3% TOTAL interrupts.RES 99502 ~ 0% -27.8% 71813 ~ 0% TOTAL interrupts.0:IO-APIC-edge.timer 2554 ~ 0% +49.1% 3809 ~ 1% TOTAL vmstat.system.cs 11524 ~ 0% -2.3% 11259 ~ 0% TOTAL vmstat.system.in 213 ~ 0% -4.3%204 ~ 0% TOTAL time.system_time 74 ~ 0% -4.1% 71 ~ 0% TOTAL time.percent_of_cpu_this_job_got 3495099 ~ 0% -3.1%3387173 ~ 0% TOTAL interrupts.LOC Thanks, Jet ./runtest.py open2 32 1 4 6 8 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
