RTEMS 4.5 Vs 4.6 Vs Linux : Performance analysis : Further Improvements: How?

[sashti srinivasan]

Hello,

    Let me begin with sincere thanks for analysing my
results and correlating with the previous ones.

    No.  Results are not wrong(atleast not because of
this reason).  I am sorry for confusion.  The previous
ones and the current ones are on different machines. 
The previous results were taken on PIII 733 MHz while
the current ones are on PIII 433 MHz machines.  This
is the most notable difference.

    However, there is no need to compare with old
results.  I have given complete set of results this
time also.  All the results are on the same
platform(PIII 433 MHz).

With Regards
Srinivasan
--- Eugene Denisov <dea at sendmail.ru> wrote:
> Hello sashti,
> 
> Wednesday, March 24, 2004, 1:50:25 PM, you wrote:
> 
> I wonder why Linux results so different from your
> previous test
> 
>                                Linux   RTEMS
>         Time To Lock a Mutex =  0.12   0.30
>       Time To Unlock a Mutex =  0.12   0.28
>       Initialize a Semaphore =  0.31   0.99
>          Destroy a Semaphore =  0.10   1.46
>               Semaphore Wait =  0.20   0.24
>               Semaphore Post =  0.19   0.31
>        Thread Switching Time =  9.85   1.81
> 
> Perhaps your tests have big miscalculation of
> measured times exceeding
> results in times.
> 
> ss> Hello All,
> 
> ss>      I have posted previously the comparison
> between
> ss> RTEMS 4.5 and linux, Requested ideas for
> improvement
> ss> of performance.  The suggestions were (1) Play
> with
> ss> compiler flags (2) Much improvements were done
> after
> ss> release of 4.5(i.e, use 4.6.).
> 
> ss>      I could succesfully build RTEMS-4.6 for
> ss> pc686(Probably there is no missing makefile in
> pre-4)
> ss> using updated toolchain.
> 
> ss>      The results of comparison between
> RTEMS-4.5,4.6
> ss> and linux are as given below.
> 
> ss> ---------------------Time in
> Microseconds--------
> ss> Time For:        RTEMS 4.6      4.5       Linux
> ss>
> -------------------------------------------------
> ss> Lock a Mutex        0.3         0.48        0.23
> ss> Unlock A Mutex      0.47        0.49        0.37
> ss> Create Mutex        0.83        0.90        0.08
> ss> Destroy Mutex       0.58        0.66        0.10
> ss> Semaphore Init      0.74        0.90        0.31
> ss> Semaphore Destroy   0.62        1.78        0.13
> ss> Semaphore Wait      0.37        0.37        0.32
> ss> Semaphore Post      0.46        0.51        0.32
> ss> Thread Switching    2.59        2.82       35.45
> ss>
> -------------------------------------------------
> 
> ss> Details:
> ss>    CPU & BSP   :  PIII 433 MHz pc686
> ss>   Linux        :  Kernel 2.6.3
> ss>   RTEMS        :  4.6 pre-4 and 4.5
> 
> ss> IMPROVEMENTS:
> ss>     I wish to improve the performance of rtems
> such
> ss> that it is close to/ better than linux.  Please
> ss> suggest me ideas for this.
> 
> ss>     Regarding the compiler flags, I tried
> -mcpu=686. 
> ss> But the performance was same as that for 386. 
> Please
> ss> suggest me ideas for improving performance of
> rtems.
> 
> ss> With Regards
> ss> Srinivasan
> 
> ss> __________________________________
> ss> Do you Yahoo!?
> ss> Yahoo! Finance Tax Center - File online. File on
> time.
> ss> http://taxes.yahoo.com/filing.html
> 
> -- 
> Best regards,
>  Eugene                           
> mailto:dea at sendmail.ru
> 


__________________________________
Do you Yahoo!?
Yahoo! Finance Tax Center - File online. File on time.
http://taxes.yahoo.com/filing.html