|
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:
& Y1 ?2 G) B; f5 Z) F a1 @/ n3 Proot@tl:~# ipcs -l1 f% M0 M i- ?4 M, Q" m( k; m: H
: d% l7 N4 S# z1 E: L! _
------ Shared Memory Limits --------
" M* ~% Y! X9 rmax number of segments = 4096, m+ x$ Q/ n9 |. w
max seg size (kbytes) = 32768
, [" C3 G5 N/ s3 [max total shared memory (kbytes) = 8388608( d: Y3 d: d0 E1 P% c
min seg size (bytes) = 1
3 S% F5 Z( }' p1 Z2 y p) l
) A; o0 k: D4 h$ U: B3 ?% T: e------ Semaphore Limits --------: [1 ]* l! s0 B, R0 l1 j1 q
max number of arrays = 1289 X( M+ X. l# @: H
max semaphores per array = 250% D8 }0 V* m9 q, V0 o( ~* ^7 {
max semaphores system wide = 32000; j0 B7 o$ @( l
max ops per semop call = 32) r6 Z1 l- ]4 z$ @7 \$ G9 R' _8 }
semaphore max value = 32767/ s! G3 p2 L) ~4 I) O. `4 z
8 O, Z [ L. u* F------ Messages Limits --------/ y# e* k6 R6 n$ a
max queues system wide = 178
1 j: F2 {& F* H+ m1 Imax size of message (bytes) = 8192
& _4 h9 @. k+ K9 U2 y& Cdefault max size of queue (bytes) = 16384- h6 d- `! s4 _" _# ?3 D
, r+ k6 n. k; R8 k
( t& O" z r* Z) d8 P4 b+ j但是,用ipcs -a 2 v' d9 O/ V# R1 |
root@tl:~# ipcs -a
% p$ H- T' R. D" a
8 y, L" Q- g! a3 i/ H1 x# B------ Shared Memory Segments --------2 l+ z6 ?5 G: v; ?
key shmid owner perms bytes nattch status
/ B& _4 T4 K8 T0x00000000 0 root 600 1024 1 dest . Z) I" w7 c9 y( M' t6 E
0x00000000 196609 root 600 1024 1 dest % D2 ^: ^( D, P3 i# S
. `1 {6 D6 v8 i0 P% @! f
------ Semaphore Arrays --------, W7 J, A5 P! a3 r
key semid owner perms nsems 0 E+ v. J' q/ T5 `$ S: M* S
0x6411074d 0 root 600 1
) T' Q/ @( K! M7 k; I5 I% G/ d0x64110957 163841 root 600 1 3 ]5 v( ?# T0 M3 O9 s6 o
0x641109a1 196610 root 600 1 * f6 `* U7 C) ?% W/ B- D' q2 C* I" s9 U
a1 u" p8 C5 x------ Message Queues --------
7 ?. C* P) F/ |4 nkey msqid owner perms used-bytes messages
# [3 q P% C1 u9 z4 C& Y6 Z
7 b' Q, Z+ z/ [4 x' g6 i6 N0 I& I* t6 o8 J! V3 b1 @3 m
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?
2 W# E& R% _" K) J. X2 X: N" p4 N' _" I
|
|