|
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:+ ?% ?+ s5 Q8 x a' k
root@tl:~# ipcs -l) d9 X0 F4 W5 S5 x Y
' L) X- a4 X# w" c; V ]6 A$ X+ f
------ Shared Memory Limits --------
$ R* D# R# o! x9 m- D5 a" pmax number of segments = 40960 ]! D8 M) g& _* n# A- |8 X" t F
max seg size (kbytes) = 32768
. R/ @8 m R3 J7 Ymax total shared memory (kbytes) = 8388608
% a( o, g- K% w& k8 Hmin seg size (bytes) = 1
5 {1 {1 B: J+ j; H. W( r6 ?5 Z& O6 S3 j7 u" v1 t* G# F
------ Semaphore Limits --------0 Y* n" R8 U9 \) G7 A5 R; ^
max number of arrays = 128
+ f7 D& T2 i+ h+ y4 c" c# Emax semaphores per array = 250
. a0 t" ^- z h) C @( g- b# Qmax semaphores system wide = 320002 c$ o) H9 h4 r
max ops per semop call = 32- u; h/ S& Y5 a
semaphore max value = 32767
6 D# G2 |+ y1 J4 e+ e3 }4 n+ E; p. k8 D" k) |; y* P, U
------ Messages Limits --------
0 p5 f$ {4 e. G5 F0 Cmax queues system wide = 178
, l) @+ N M% N. |( ?4 _max size of message (bytes) = 8192
& t9 u, ^. m: u+ V+ udefault max size of queue (bytes) = 16384( K9 g& ]7 b5 k K! V/ c7 h+ G
$ k8 c6 k, k8 o6 |6 U- } H, f7 F4 y& \0 ?
但是,用ipcs -a
) k0 i; P3 I9 a8 z0 broot@tl:~# ipcs -a2 ^' d h2 N6 D* C" `5 P
* i+ l6 d2 l$ m# h
------ Shared Memory Segments --------
1 \; c8 B& s; x. ikey shmid owner perms bytes nattch status
+ T7 J; ]5 a F, | \ J8 j+ O0x00000000 0 root 600 1024 1 dest
. o3 I& \( {% a/ ^: K; A0x00000000 196609 root 600 1024 1 dest
! B, `& d* _. x+ l' p& ?( S7 |
\2 }- j/ {/ F: p* J------ Semaphore Arrays --------
; T9 [) A- }5 U+ X) h6 rkey semid owner perms nsems $ t/ r0 A$ K6 J" Y' f0 O
0x6411074d 0 root 600 1
: e! l% {( N2 h6 r8 `# Y0x64110957 163841 root 600 1 ~: H; U/ i, u9 L
0x641109a1 196610 root 600 1 ' @: c( E. x _. R4 ^" _
$ e8 n% M8 x6 Y) Y3 U------ Message Queues --------
. W. D H' q" Y* J! gkey msqid owner perms used-bytes messages * u/ P9 o, O, F- M; t
+ X4 U' l1 Z2 V: z8 @) t4 z) A: g9 n) z, Q9 j
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?& W" B* `$ N. H) D9 Z! N6 e, A9 ~
" K6 ^1 |/ y; d& V4 n2 b; G" H4 L |
|