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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:
# E* _$ J- d) Froot@tl:~# ipcs -l
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------ Shared Memory Limits --------! |+ t: Y6 P z1 `+ i
max number of segments = 4096# u4 r/ a. U3 B9 C. g5 k
max seg size (kbytes) = 32768
0 L! N* H: Z8 `2 _4 m" M( M; o% amax total shared memory (kbytes) = 8388608+ k1 C* L% u% J+ {" o
min seg size (bytes) = 1
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. Q8 h: U, \5 M3 t+ M, V# y9 A1 _------ Semaphore Limits --------
6 |) F! W" W: n& t' c, G4 r9 Gmax number of arrays = 1283 d9 L$ b: F% S
max semaphores per array = 250
: i8 ]/ S! T2 Y1 H, omax semaphores system wide = 320000 {' O) t T7 u9 p9 V* U" p @+ |
max ops per semop call = 32
. I( y: w% ]4 g9 W, s! Ssemaphore max value = 32767: X& K4 P) R u( f/ a+ C0 |
+ l- f) N- |% E------ Messages Limits --------2 A" z3 @( _3 M/ k0 O
max queues system wide = 178$ `/ G4 B# q0 Q- d5 c$ Z
max size of message (bytes) = 8192. q3 Q6 B6 b+ j$ \
default max size of queue (bytes) = 163847 W. \5 a8 U7 G7 X* K# @7 H9 P' t. k
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但是,用ipcs -a & @1 _. ^, j& G+ d# B k5 }
root@tl:~# ipcs -a
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1 G) {) z' v" n. k* Z/ M------ Shared Memory Segments --------) p. Y0 d1 d; [2 L, w6 j
key shmid owner perms bytes nattch status
, I* G$ e5 i8 J! R; K2 n ^7 s% v0x00000000 0 root 600 1024 1 dest 4 [! Q4 o4 @( W1 j7 W$ r8 S
0x00000000 196609 root 600 1024 1 dest 5 h( t! {; n4 G
# ]2 a9 N8 W/ p5 Y0 S& U------ Semaphore Arrays --------
5 M+ c; o7 C Mkey semid owner perms nsems 3 Y2 X. C0 r0 U. Q+ q% }1 B4 @
0x6411074d 0 root 600 1
! C5 y. F0 }7 }& ?# s* m! Z0x64110957 163841 root 600 1
; \! O/ x8 A4 a: a, a1 T: ^0x641109a1 196610 root 600 1
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% `( }+ R3 |% O, y------ Message Queues --------, j2 E* [4 B, D" w
key msqid owner perms used-bytes messages 8 G! V: u! j- x) n/ V( z. k
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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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