I miss CC's. so I resend.
First of all, I tried test it in embedded board.
---
<test machine>
CPU: 200MHz(ARM926EJ-S)
MEM: 32M
SWAP: none
KERNEL : 2.6.25-rc1
<test 1> - NO SWAP
before :
Running with 5*40 (== 200) tasks.
Time: 12.591
Command being timed: "./hackbench.arm 5 process 100"
User time (seconds): 0.78
System time(seconds): 13.39
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 14.22s
Major (requiring I/O) page faults: 20
max parallel reclaim tasks: 30
max consumption time of
try_to_free_pages(): 789
after:
Running with 5*40 (== 200) tasks.
Time: 11.535
Command being timed: "./hackbench.arm 5 process 100"
User time (seconds): 0.69
System time (seconds): 12.42
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 13.16s
Major (requiring I/O) page faults: 18
max parallel reclaim tasks: 4
max consumption time of
try_to_free_pages(): 740
<test 2> - SWAP
before:
Running with 6*40 (== 240) tasks.
Time: 121.686
Command being timed: "./hackbench.arm 6 process 100"
User time (seconds): 1.89
System time (seconds): 44.95
Percent of CPU this job got: 37%
Elapsed (wall clock) time (h:mm:ss or m:ss): 2m 3.79s
Major (requiring I/O) page faults: 230
max parallel reclaim tasks: 56
max consumption time of
try_to_free_pages(): 10811
after :
Running with 6*40 (== 240) tasks.
Time: 67.757
Command being timed: "./hackbench.arm 6 process 100"
User time (seconds): 1.56
System time (seconds): 35.41
Percent of CPU this job got: 52%
Elapsed (wall clock) time (h:mm:ss or m:ss): 1m 9.87s
Major (requiring I/O) page faults: 16
max parallel reclaim tasks: 4
max consumption time of
try_to_free_pages(): 6419
<test 3> NO_SWAP
before:
' OOM killer kill hackbench!!!'
after :
Time: 16.578
Command being timed: "./hackbench.arm 6 process 100"
User time (seconds): 0.71
System time (seconds): 17.92
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 18.69s
Major (requiring I/O) page faults: 22
max parallel reclaim tasks: 4
max consumption time of
try_to_free_pages(): 1785
===============================
It was a very interesting result.
In embedded system, your patch improve performance a little in case
without noswap(normal case in embedded system).
But, more important thing is OOM occured when I made 240 process
without swap device and vanilla kernel.
Then, I applied your patch, it worked very well without OOM.
I think that's why zone's page_scanned was six times greater than
number of lru pages.
At result, OOM happened.
So, I think your patch also improves performance in embedded system.
In case OOM didn't occur, reclaiming performance without swap device
was better than one with swap device.
Now, I think we need to improve reclaiming procedure in embedded
system(UP and NO swap).
On Wed, Feb 20, 2008 at 7:09 PM, KOSAKI Motohiro
<[EMAIL PROTECTED]> wrote:
> Hi
>
>
> > > > * max parallel reclaim tasks:
> > > > * max consumption time of
> > > > try_to_free_pages():
> > >
> > > sorry, I inserted debug code to my patch at that time.
> >
> > Could you send me that debug code ?
> > If you will send it to me, I will test it my environment (ARM-920T,
> Core2Duo).
> > And I will report test result.
>
> attached it.
> but it is very messy ;-)
>
> usage:
> ./benchloop.sh
>
> sample output
> =========================================================
> max reclaim 2
> Running with 120*40 (== 4800) tasks.
> Time: 34.177
> 14.17user 284.38system 1:43.85elapsed 287%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (3813major+148922minor)pagefaults 0swaps
> max prepare time: 4599 0
> max reclaim time: 2350 5781
> total
> 8271
> max reclaimer
> 4
> max overkill
> 62131
> max saved overkill
> 9740
>
>
> max reclaimer represent to max parallel reclaim tasks.
> total represetnto max consumption time of try_to_free_pages().
>
> Thanks
>
>
--
Thanks,
barrios
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
