On 12/12/06, Joseph Koshy <[EMAIL PROTECTED]> wrote:
I can think of one of two scenarios:
1) the squid process was in the kernel when the
samples got taken. This could happen if the
process was say in select() handling all the time.
2) There a bug in my process handling code that is
being triggered (hwpmc undercounts process-mode
samples), and samples are being missed.
I can't imagine why Squid would suddenly be in kernel mode all the time.
In fact, its in kernel space about 20% of the time under this workload
(with another 30% spent in interrupts.)
Here's the output from my latest attempt:
jacinta# pmcstat -S instructions -O samples.out
^Cjacinta# ls -l
total 89650
-rw-r--r-- 1 root wheel 576 Dec 12 03:52 1
-rw-r--r-- 1 root wheel 91719744 Dec 12 04:10 samples.out
jacinta# pmcstat -R samples.out -g
jacinta# cd k7-retired-instructions/
jacinta# ls
kernel.gmon ld-elf.so.1.gmon libc.so.6.gmon
jacinta# ls -l
total 3116
-rw-r--r-- 1 root wheel 2704268 Dec 12 04:10 kernel.gmon
-rw-r--r-- 1 root wheel 59474 Dec 12 04:10 ld-elf.so.1.gmon
-rw-r--r-- 1 root wheel 372962 Dec 12 04:10 libc.so.6.gmon
Squid is running but there's no profiling information for it still..
Scarily, on this Athlon 1800XP:
% cumulative self self total
time seconds seconds calls ms/call ms/call name
5.1 45254.00 45254.00 SHA256_Transform [1]
4.0 81184.00 35930.00 tcp_input [2]
3.8 114879.00 33695.00 tcp_output [3]
2.8 139645.00 24766.00 critical_exit [4]
2.5 162199.00 22554.00
bus_dmamap_load_mbuf_sg [5]
2.3 182415.00 20216.00 generic_bzero [6]
2.1 201156.00 18741.00 kqueue_register [7]
The kernel spends quite a bit of time in SHA256_Transform; I wonder if
it has to do with the sheer volume of TCP connections I'm making..
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