poll: out of memory

by Dan Kege » Thu, 13 Jan 2000 04:00:00

I've written a little program that attempts to
measure various system limits: file handles,
TCP sockets, TCP ports, and 'TCP connections', or
'how many times I can call connect() on an unbound
socket before I run out of anonymous ports'.
All work fine except the last. If I raise ulimit -n
to 2048 or so, and file-max to 8192 or so,
I start seeing out of memory errors from poll()!

Here's my test program:
http://www.kegel.com/dkftpbench/dklimits.c
Can anyone tell me what's going on?

Thanks,
Dan

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# vmstat 3
procs memory page disk faults
cpu
r b w swap free re mf pi po fr de sr m0 m1 m2 m3 in sy cs
us sy id
0 0 0 758192 325120 0 74 32 18 55 0 5 1 1 1 0 909 2218 1060
6 16 78
0 1 0 2636576 23768 0 1 42 13 330 0 35 0 0 0 0 1298 5598 3318
17 35 48
0 0 0 2636568 23760 0 0 8 58 208 0 18 0 0 0 0 1166 3485 1796
14 30 57
0 0 0 2636568 23768 0 0 13 13 82 0 6 0 0 0 0 927 3943 1680
11 30 59
0 0 0 2636568 23768 0 0 0 58 186 0 11 0 0 0 0 1408 4989 2033
16 35 50
0 1 0 2638040 25584 2 306 74 149 301 0 18 11 10 11 0 1556 4339 1722
22 30 49
0 0 0 2639208 26560 0 0 5 45 45 0 0 0 0 0 0 984 3539 1589
10 29 61
0 0 0 2639208 26312 0 0 24 42 42 0 0 0 0 0 0 1446 5102 2840
12 35 52