[omniORB] [4.0.6, omnithreads] How many philosophers does it take to screw an omnithreads library?

[R.]

--- renny.koshy at rubixinfotech.com wrote:

> My guess is that you're probably hitting your OS's
> per-process-thread-limit.
> 


Hi Renny and thanks for Your answer.

I exclude the OS per-process-limit since it's set at
-1 
(no limit) and an equivalent PhiloDiner made in C with
Pthreads goes happily to 2000 Philosophers and
counting.

OmniThreads gives an error on mmap2 allocating shared
memory for the 381th thread:

mmap2(NULL, 8388608, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xbe802000
mprotect(0xbe802000, 4096, PROT_NONE)   = 0
clone(child_stack=0xbf0014c4,
flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED,
parent_tidptr=0xbf001bf8, {entry_number:6,
base_addr:0xbf001bb0, limit:1048575, seg_32bit:1,
contents:0, read_exec_only:0, limit_in_pages:1,
seg_not_present:0, useable:1},
child_tidptr=0xbf001bf8) = 5671
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xbf002000
mprotect(0xbf002000, 4096, PROT_NONE)   = 0
clone(child_stack=0xbf8014c4,
flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED,
parent_tidptr=0xbf801bf8, {entry_number:6,
base_addr:0xbf801bb0, limit:1048575, seg_32bit:1,
contents:0, read_exec_only:0, limit_in_pages:1,
seg_not_present:0, useable:1},
child_tidptr=0xbf801bf8) = 5672
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot
allocate memory)
futex(0x414b1874, FUTEX_WAKE, 2147483647) = 0
futex(0xb7f99904, FUTEX_WAKE, 2147483647) = 0
rt_sigprocmask(SIG_UNBLOCK, [ABRT], NULL, 8) = 0
tgkill(5290, 5290, SIGABRT)             = 0
--- SIGABRT (Aborted) @ 0 (0) ---
+++ killed by SIGABRT +++










> Renny Koshy
> President & CEO

> 
> --------------------------------------------
> RUBIX Information Technologies, Inc.
> www.rubixinfotech.com
> 
> 
>                                                     
>                       
>              "R."                                   
>                       
>              <io0911 at yahoo.com                      
>                       
>              >                                      
>                    To 
>              Sent by:                 
> omniorb-list at omniorb-support.com    
>              omniorb-list-boun                      
>                    cc 
>              ces at omniorb-suppo                      
>                       
>              rt.com                                 
>               Subject 
>                                        [omniORB]
> [4.0.6,                   
>                                        omnithreads]
> How many pilosophers   
>              05/22/2006 09:13          does it take
> to screw   an          
>              AM                        omnithreads
> library?                
>                                                     
>                       
>                                                     
>                       
>                                                     
>                       
>                                                     
>                       
>                                                     
>                       
>                                                     
>                       
> 
> 
> 
> 
> 
> For my Linux box the answer is 381.
> 
> if i change N_DINERS in diners.cc example:
> 
> #define N_DINERS 500    // n philosophers sharing n
> chopsticks
> 
> the program segfaults at 381.
> 
> 
> Is there a limit to the number of threads in
> onithread?
> 
> 
> Thanks in advance,
> 
> Bob
> 
> 
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam
> protection around
> http://mail.yahoo.com
> 
> _______________________________________________
> omniORB-list mailing list
> omniORB-list at omniorb-support.com
>
http://www.omniorb-support.com/mailman/listinfo/omniorb-list
> 
> 
> 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com