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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:# Z) ?/ {! G0 F
root@tl:~# ipcs -l8 V" {9 Y/ w+ e9 s6 U
9 o. k5 x8 B, B; P. M* Q# ~------ Shared Memory Limits --------
+ V' }2 f+ \! @max number of segments = 4096
' B+ w; R; _% C( Xmax seg size (kbytes) = 32768
_- Z, P0 R2 Q2 \3 h Qmax total shared memory (kbytes) = 8388608) S+ J) ?6 G7 N4 I$ F( \7 X
min seg size (bytes) = 1
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8 Q1 U. b9 |' o$ L: v------ Semaphore Limits --------
% ~8 |% S; g5 |0 r8 g- {max number of arrays = 128
) J: o+ k; K( F. \8 K6 A( T9 qmax semaphores per array = 250
! u0 _* Z! X; `& |1 y& j: P9 ~max semaphores system wide = 32000
% m; n2 q* n0 D8 _' [max ops per semop call = 32
* A) X* d5 c! A5 L$ a9 |semaphore max value = 32767
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------ Messages Limits --------
: q/ R5 U$ o, y9 j! E3 Jmax queues system wide = 178/ v& b+ |' `7 U# J3 s) w
max size of message (bytes) = 8192
" ^& U9 o% z) z) tdefault max size of queue (bytes) = 16384
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# Z% C# D, {2 i, h但是,用ipcs -a
( ^1 C C# j4 ?3 F* N+ groot@tl:~# ipcs -a
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------ Shared Memory Segments --------+ u2 A, h2 ~9 v# p
key shmid owner perms bytes nattch status 9 m* H! v! J+ B5 j! O6 m" n7 j
0x00000000 0 root 600 1024 1 dest
( e: [+ Y% _# z2 V1 K9 B0x00000000 196609 root 600 1024 1 dest 2 l. l; D4 O8 u6 ]
8 r( E% ?4 h: k+ j------ Semaphore Arrays --------
- C4 x- v6 S/ _key semid owner perms nsems
5 N) s' ?. B; c$ J0x6411074d 0 root 600 1
% o, n6 @" u# g) u2 Z9 F7 D" |" m0x64110957 163841 root 600 1 9 X) y) ^' w5 j5 B Q8 B
0x641109a1 196610 root 600 1 6 R& b( y& G- N+ q/ h, ?
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------ Message Queues -------- d& N8 J! `6 ]- Z* J c
key msqid owner perms used-bytes messages % [0 m9 S% o# {7 ~" m% ?2 q5 d
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6 x: _3 X) m% v, q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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