From: mark_round@ipcmedia.com
Date: Tue Sep 13 2005 - 06:19:15 EDT
Hi all,
Apologies in advance for the somewhat open-ended question here.
I have a very busy web server, that is experiencing a large number of
system calls - a snip from vmstat 1 produces :
kthr memory page disk faults
cpu
r b w swap free re mf pi po fr de sr m1 m1 m1 m2 in sy cs us
sy id
0 0 0 6793080 5648456 14 123 0 8 0 0 0 0 0 0 0 1052 70799 1308
51 25 23
0 0 0 6800984 5650440 195 800 0 8 8 0 0 0 0 0 0 1334 49447 1476
38 23 39
0 0 0 6808168 5651576 63 238 0 8 8 0 0 1 1 1 0 1225 49429 1686
35 26 40
0 0 0 6807528 5652248 22 275 0 16 16 0 0 0 0 0 0 1040 41245 1252
46 16 38
0 0 0 6815480 5654432 50 306 0 16 16 0 0 0 0 0 0 1114 47343 1410
37 21 42
1 0 0 6825704 5657904 56 148 0 24 8 0 0 0 0 0 0 1388 68366 1648
53 34 13
7 0 0 6825648 5657784 50 170 0 0 0 0 0 0 0 0 0 1240 53751 1781
42 17 41
0 0 0 6825704 5657832 17 102 0 8 0 0 0 0 0 0 0 951 58447 1292
41 20 39
11 0 0 6825704 5657808 33 137 0 0 0 0 0 0 0 0 0 1011 53959 1219
54 23 23
6 0 0 6824168 5657184 41 173 0 32 8 0 0 1 1 1 0 1400 69368 1381
54 31 15
How can I find out what these calls are ? I have experimented with
lockstat, but this doesn't seem to provide me with the information I'm
after. I know there are many Dtrace scripts that would provide me with
the information I'm after - but I am on Solaris 9/Sparc (V240, 2x1.2Ghz,
8Gb RAM) so that is sadly not an option. I'd ideally like something
like a system-wide "truss"; In an ideal world, I'd like to be able to
see most frequently called syscalls, and see what arguments are being
passed to them. For instance, I suspect that our web application is
opening a large number of files, but I have no way of proving this...
Any input would be much appreciated. I will summarise any responses I
get.
-Mark
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