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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:
: G8 c% B0 X- s7 ^+ g5 Zroot@tl:~# ipcs -l1 r5 ?9 n$ Z+ X @- m- a9 V
: S/ _0 v0 f. \------ Shared Memory Limits --------6 P9 @+ m9 Q) m: H1 f7 H6 e. x
max number of segments = 4096
5 z; z% l. m G6 S9 l; s0 g. {max seg size (kbytes) = 32768, u. m5 b, K# @+ ~8 D
max total shared memory (kbytes) = 8388608/ ?1 F/ {8 F( u) Z$ a
min seg size (bytes) = 1
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/ K! M1 O- @, a4 j/ N, b' }9 N------ Semaphore Limits --------
% K1 H( U/ s1 Pmax number of arrays = 1288 ~* o! F/ I# g1 E( ^
max semaphores per array = 250
7 u$ g; ]' H B: B# _max semaphores system wide = 32000
& V4 F- T( D4 w. j4 Amax ops per semop call = 32* f: I/ k0 g$ D" Z' I8 T2 I# M
semaphore max value = 32767
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------ Messages Limits --------
* z0 q# V% X! M9 qmax queues system wide = 178( M7 K- r! w; I1 k% u2 L( i
max size of message (bytes) = 8192
5 Q- W: k3 T1 p, a8 N) D5 g* }default max size of queue (bytes) = 16384
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但是,用ipcs -a ! z0 h9 ]' [8 {- a: k, \! |
root@tl:~# ipcs -a3 q4 a- w# X+ O# i. M( T
4 W8 |# m% U/ H2 m M------ Shared Memory Segments --------* t& }5 q1 z" O' a9 T& h3 i4 M8 m* D
key shmid owner perms bytes nattch status c& f \2 y8 l. Y3 e
0x00000000 0 root 600 1024 1 dest
D( l1 v3 H7 G* ?. E0x00000000 196609 root 600 1024 1 dest 4 n+ \% d9 N3 Z8 |1 l1 _
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------ Semaphore Arrays --------0 e. T7 ` [0 v( R q
key semid owner perms nsems
7 F: f+ L: ?4 J0x6411074d 0 root 600 1 * Q% H& F! T$ @; U# d" K1 r
0x64110957 163841 root 600 1
* U* m6 F4 a( r6 O' Y0x641109a1 196610 root 600 1
: Z8 A) ^4 Y, J$ E l
, M5 ^' d7 E, |; G------ Message Queues --------
0 P5 a4 {1 [$ K5 v: @5 ~% r! X8 e- N" vkey msqid owner perms used-bytes messages
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( N* D G7 G' U; |# g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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