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您好, 在使用OMAPL138 evm过程中,我使用了MessageQ和ringIO来传输数据。利用ipcs -l ,情况如下:
6 Q' `2 ~: D9 N8 K! b$ M) Sroot@tl:~# ipcs -l4 m. ~- n3 c. H8 s' P) b& A
7 y3 o, a4 r8 n* [7 G: F2 X------ Shared Memory Limits --------) ~# ] {0 k- C
max number of segments = 4096
4 }& i9 c5 P( p ~max seg size (kbytes) = 327683 K4 v( N5 b0 r
max total shared memory (kbytes) = 8388608
3 J1 m" q3 _# D9 |# vmin seg size (bytes) = 1) h6 ~/ [3 l, ?2 P; o
5 c: ]1 m% j5 g! |5 C------ Semaphore Limits --------' B3 H4 t& U/ M# T; g& J$ M
max number of arrays = 128( C; C- k& E" g9 @% [
max semaphores per array = 250
2 V/ H' b, D6 L- B# ^! Smax semaphores system wide = 32000
) E* t$ |2 J3 e+ j- Q! d0 M! `max ops per semop call = 32
2 J$ C; l3 }: a: G" k8 o1 L- ~semaphore max value = 32767
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------ Messages Limits --------
$ I* a2 i f# j6 Pmax queues system wide = 178
- u7 H9 G# K M, N' ^max size of message (bytes) = 81920 o% _: h6 d" e, s# Q6 l0 k
default max size of queue (bytes) = 16384
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但是,用ipcs -a k+ Q$ ~: ]3 F% O5 ], k8 ^/ k3 ]" ?
root@tl:~# ipcs -a- T' {) D) _& L
* K3 `5 | z1 J7 v5 L------ Shared Memory Segments --------
( U% \, x+ R7 K K, v7 v9 D" Skey shmid owner perms bytes nattch status 3 R0 p8 x$ ]( R ]
0x00000000 0 root 600 1024 1 dest ! q! h( \0 K+ I& ^
0x00000000 196609 root 600 1024 1 dest 4 ]- Y! Z% W. `4 N$ Q& C
! S, `8 f/ K& f- W" o------ Semaphore Arrays --------7 F/ A0 m& ?4 r* f# I
key semid owner perms nsems
& p; p- \- l2 v! @; A* p8 |" b5 E0x6411074d 0 root 600 1 : h& f) U# t2 o
0x64110957 163841 root 600 1
3 q4 v' A5 Z' u: }0x641109a1 196610 root 600 1 ' L/ s8 e. ~" d* o8 y
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------ Message Queues --------
5 r v1 k/ A, Ykey msqid owner perms used-bytes messages
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, B6 ]5 e' a! ]5 q; @( {5 G1 V* M7 i请问,我的共享内存使用大小为 (float *)ring_buffer_acquired(ad->buffer, 2320 * sizeof(float)*18); 远大于1024BYTE ,请问为什么?
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