1994.8.24
SUBJECT: Axil-311 에서 하나의 Process 가 최대 file open #
MEANING OF THIS MEMO:
1. 현대증권 의 Axil 311 에서 Communication Server Process 가 돌고있으면서
LAN 상의 PC 가 증권의 관심종목이나, 현재가를 조회할경우에 Socket
Connection으로 하나의 fd(file descriptors) 를 할당하는데 64개 가 최대.
256 으로 늘이는 방법을 서술함.
2. fd 가 64 가 되면 error #24 "Too many files open"
3. fd 중에서 0(stdin), 1(stdout), 2(stdout), Application 에서 사용한느것도있어서 단말을 50 대 이상을 물릴수가 없음.
4. HelpDesk 에서 "Too many files open" 찾음.
DESC: man limit 참조
1. more a.c
#include
#include
main()
{
int fd;
fd = open("/tmp/aaa",O_CREAT);
printf("fd is %d\n", fd);
fd = open("/tmp/aa0",O_CREAT);
printf("fd is %d\n", fd);
fd = open("/tmp/aa1",O_CREAT);
printf("fd is %d\n", fd);
...............
...............
fd = open("/tmp/a80",O_CREAT);
printf("fd is %d\n", fd);
}
2. a > a.result
fd is 3
fd is 4
fd is 5
......
......
fd is 59
fd is 60
fd is 61
fd is 62
fd is 63
fd is -1
fd is -1 <-----Error 24:Too many files open
.....
.....
fd is -1
fd is -1
fd is -1
fd is -1
3. vi /.cshrc
...
limit descriptors 256
...
4. a > a.result2
fd is 3
fd is 4
fd is 5
...
....
fd is 62
fd is 63
fd is 64
fd is 65
fd is 66
fd is 67
fd is 68
fd is 69
fd is 70
fd is 71
fd is 72
fd is 73
fd is 74
fd is 75
fd is 76
fd is 77
fd is 78
fd is 79
fd is 80
fd is 81
fd is 82
fd is 83
fd is 84
4.결론.
csh 에서는 application 이 file open 을 수행할때 시스템에서 제한을 할수가있다.
Default 는 soft-limit 의 descriptors 가 64 이고 hard-limit(-h option) 은 256.
ex)
atom# limit
cputime unlimited
filesize unlimited
datasize unlimited
stacksize 8192 kbytes
coredumpsize unlimited
memoryuse unlimited
descriptors 64
atom# limit -h
cputime unlimited
filesize unlimited
datasize unlimited
stacksize unlimited
coredumpsize unlimited
memoryuse unlimited
descriptors 256
******************************************
* .cshrc 에 limit descriptos 256 으로 함 *
******************************************
atom# limit
cputime unlimited
filesize unlimited
datasize unlimited
stacksize unlimited
coredumpsize unlimited
memoryuse unlimited
descriptors 256
Revision History
Created on Dec 24 ,1994