So I loaded up ntop and isolated http, dns, ssh, afs, and mysql. I ran the previous test (ab -k -c <users> -t 120 <url>) again for various numbers of users and here is what I came up with: 1 user: H:29.5M D:1.8M A:4.6K M:19.9M O:1.2M 2 users: H:50.3M D:3.0M A:2.0K M:33.7M O:241.9K 3 users: H:56.1M D:3.3M A:0K M:37.8M O:234.6K 4 users: H:56.2M D:3.3M A:0K M:37.9M O:127.9K 5 users: H:48.0M D:2.9M A:2.0K M:32.4M O:246.3K 8 users: H:23.4M D:1.4M A:2.3K M:15.8M O:135.6K 10 users: H:16.6M D:1.0M A:3.8K M:11.3M O:385.6K 20 users: H:16.7M D:1.0M A:0K M:11.7M O:235.5K 30 users: H:16.8M D:1.0M A:1.9K M:11.9M O:346.2K
H - http, D - dns, A - afs, M - mysql, O - other This shows an interesting trend in that there is a peak level of performance, as well as a worst case performance level as well. It also shows that afs traffic is essentially zero. This would indicate that my performance bottleneck is in accessing the afs cache. If I can do further diagnostics/testing let me know. On 8/13/07, Russ Allbery <[EMAIL PROTECTED]> wrote: > "Nate Gordon" <[EMAIL PROTECTED]> writes: > > > I've looked through it before, but I usually get too annoyed when the > > asfd process kernel panics my machine if I get dcache/stats too high. > > My webservers deal with an annoying large volume of content (~35GB) and > > defining a working set size seems to be a moving target to say the > > least, but I'll take another stab at it. > > The other thing that would be very interesting to know is whether the time > is going into data management in the cache manager or is really going into > network traffic to the file server. If you can use something like tcpdump > to see how much Rx traffic there is to the file server under different > loads and see if that increases with increasing request time or if it > stays the same, that would be very interesting. If it stays the same, > that points to some sort of inefficiency in the cache manager itself with > its data structure handling. > > -- > Russ Allbery ([EMAIL PROTECTED]) <http://www.eyrie.org/~eagle/> > -- -Nathan Gordon If the database server goes down and there is no code to hear it, does it really go down? <esc>:wq<CR> _______________________________________________ OpenAFS-info mailing list [email protected] https://lists.openafs.org/mailman/listinfo/openafs-info
