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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:
+ g, e2 X1 F# M8 _, S: rroot@tl:~# ipcs -l
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------ Shared Memory Limits --------4 C& W9 J( e+ d6 |) X
max number of segments = 4096
: U6 P# t m3 j; Nmax seg size (kbytes) = 32768, q& D' C5 z' O2 F! v1 E
max total shared memory (kbytes) = 8388608, F7 L2 x' |2 w
min seg size (bytes) = 1
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------ Semaphore Limits --------
- Q4 L; ?" l- S2 i* q! F: {% Wmax number of arrays = 128" S& y& O: X( l$ v0 H3 k& ^
max semaphores per array = 250$ ]6 ~; C$ Z- d% B) W
max semaphores system wide = 32000& `0 H2 s8 w! S% o% c. k$ x1 Z: [
max ops per semop call = 32
- g. w" b' K0 H( @) s8 Ksemaphore max value = 32767
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------ Messages Limits --------
7 e- f' }" |% P5 M) B- ?' x; K; Omax queues system wide = 178
v# y2 E$ S6 X; Pmax size of message (bytes) = 8192
5 p2 f3 o7 E2 X3 \: wdefault max size of queue (bytes) = 163846 k2 U; m4 ?8 h6 A2 K
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但是,用ipcs -a
, o j0 M- u% E: I' t eroot@tl:~# ipcs -a
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) {8 b/ K" M! h* i H------ Shared Memory Segments --------
! D* x, @7 i1 R) F, |key shmid owner perms bytes nattch status
: R1 C0 \3 S4 q: k* V' Y3 g* k1 h0x00000000 0 root 600 1024 1 dest
% k5 q$ ?0 {7 K, T/ [$ g7 ^3 j# d0x00000000 196609 root 600 1024 1 dest
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( L# y6 z9 j/ l, M------ Semaphore Arrays --------5 k3 O$ z' r' o
key semid owner perms nsems
# u- i8 u! p S7 I3 r0x6411074d 0 root 600 1
5 e. p# b; O a, n! v# g k0x64110957 163841 root 600 1
: S' B, w6 R! ]' b" ?0 v- y0x641109a1 196610 root 600 1
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------ Message Queues --------9 Q/ |! \8 R" D p6 }
key msqid owner perms used-bytes messages + [. M' v7 d0 e9 x8 X
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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?% L! _, H7 L) t$ K1 D
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