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Re: [Linux-cluster] GFS or Web Server Performance issues?

isplist logicore net wrote:

Here is ab sending a test to an LVS server in front of a 3 node web server. The average loads on each server was around 8.00 to 10.00. These aren't very good numbers and I'm wondering where to start looking.

Using a load balancer in front of GFS nodes is tricky. Make sure to set your scheduling rule (or whatever it is called in LVS) in such a way that it would not generate un-necessary lock traffic. For example, you don't want the same write lock to get rotated between three nodes. Be aware that moving a write lock between nodes requires many steps that include a disk flush.

-- Wendy

These are pretty much default apache RPM versions out of the box.

# ab -kc 50 -t 30
This is ApacheBench, Version 2.0.41-dev <$Revision: 1.141 $> apache-2.0
Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright (c) 1998-2002 The Apache Software Foundation, http://www.apache.org/

Benchmarking (be patient)
Finished 130 requests

Server Software:        Apache
Server Hostname:
Server Port:            80

Document Path:          /
Document Length:        8997 bytes

Concurrency Level:      50
Time taken for tests:   30.234185 seconds
Complete requests:      130
Failed requests:        0
Write errors:           0
Keep-Alive requests:    0
Total transferred:      1371090 bytes
HTML transferred:       1299586 bytes
Requests per second:    4.30 [#/sec] (mean)
Time per request:       11628.532 [ms] (mean)
Time per request:       232.571 [ms] (mean, across all concurrent requests)
Transfer rate:          44.25 [Kbytes/sec] received

Connection Times (ms)
             min  mean[+/-sd] median   max
Connect:        0    1   1.4      2       4
Processing:   409 6228 4357.5   5227   16317
Waiting:      369 6146 4370.8   5199   16261
Total:        409 6230 4358.1   5230   16321

Percentage of the requests served within a certain time (ms)
 50%   5230
 66%   8331
 75%   9310
 80%  10386
 90%  12820
 95%  14502
 98%  15399
 99%  15746
100%  16321 (longest request)

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