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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:
0 e3 v, G E. hroot@tl:~# ipcs -l; G, S6 z, F& g: F
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------ Shared Memory Limits --------
3 R: \0 y* l. A! E* `max number of segments = 4096
' G$ i) N& R$ s9 R# C, e; Qmax seg size (kbytes) = 32768
% M q1 l0 n( j+ @8 p$ Q6 P" Amax total shared memory (kbytes) = 8388608- B$ i9 d u$ G# Q7 e4 Z
min seg size (bytes) = 1
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, ~ G0 o: F$ v) o% E------ Semaphore Limits --------& [, M6 e6 ]$ c$ J! K6 v+ Y1 \
max number of arrays = 1285 P9 k, B/ G, N* M
max semaphores per array = 2504 d( [( e7 T* H3 \7 E) J
max semaphores system wide = 32000" O5 K- V1 L( P' m. f' X5 l! q. [
max ops per semop call = 32
/ Q' t1 M' ?6 x+ w/ L1 Xsemaphore max value = 32767
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------ Messages Limits --------: \% q; j% F7 T- m+ h; `" c% T6 Q" T
max queues system wide = 178
) l1 J( T# Z) [5 r6 Z; L* M& Imax size of message (bytes) = 81923 O) R) B; ~3 s+ L
default max size of queue (bytes) = 16384
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% }* V! A" P' f1 q l1 L3 `0 O但是,用ipcs -a 3 C4 b: g& E+ Y0 N6 B, H3 l3 Y
root@tl:~# ipcs -a
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------ Shared Memory Segments --------; ?# v8 L# y$ \. L0 @0 p' c& e
key shmid owner perms bytes nattch status
! E5 v6 e) @7 Z9 x0x00000000 0 root 600 1024 1 dest 4 v/ b( b, _, Q* l, M6 Q2 P
0x00000000 196609 root 600 1024 1 dest 7 |1 u ?- [3 L# C7 [( g: W! p2 P
6 |- I7 Z5 p2 P, w: q8 A' M' P------ Semaphore Arrays --------4 K# v1 H, \5 o6 V/ }8 o5 g$ ]; v
key semid owner perms nsems * E, R% y. R% ~, v2 A
0x6411074d 0 root 600 1
$ R$ t1 p6 u( E! E1 g) \0x64110957 163841 root 600 1
( Y, [5 v1 ?/ }! C0x641109a1 196610 root 600 1 # X( g/ J: g, _8 ^9 B5 a
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------ Message Queues --------, e" F" W n: {7 ], L9 O. q
key msqid owner perms used-bytes messages ' F" m* ~3 q; L% t8 k& u( `
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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?3 R* J, e$ v/ h; | I
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