I would expect that adding anything (including a load balancer) in the path would increase the time.
On Thu, May 27, 2021 at 6:22 AM Marc Serra <mse...@manxa.net> wrote: > Hi, I'm trying to understand how to load balancing works and testing it's > benefits, and I'm in a trouble: in my tests (using ab command) I got better > performance without the load balancer. > > I try to describe my environment... > > I created three VM on Virtualbox with the same hardware and software > configuration and redirected ports using NAT: > CPU: 1 > RAM: 1024MB > Network: NAT > Apache version: 2.4.41 > Kernel: Linux node1 5.4.0-73-generic #82-Ubuntu SMP Wed Apr 14 17:39:42 > UTC 2021 x86_64 x86_64 x86_64 GNU/Linux > OS: Ubuntu server 20.04.2 > > The machines: > central: only acts as a load balancer (not a balancer member), otherwise > used as 'normal' apache server for results comparison. NAT from 8010 to 80 > node1: when load balancer is configured in the central machine, acts as > balancer member. NAT from 8011 to 80 > node2: when load balancer is configured in the central machine, acts as > balancer member. NAT from 8012 to 80 > > Here a list of apache loaded module. > > spoiler!!! node1 and node2 have the same modules. central have the same > modules as nod1 and node2 plus lbmethod_byrequests_module (shared)... > > Apache loaded modules in central: > Loaded Modules: > core_module (static) > so_module (static) > watchdog_module (static) > http_module (static) > log_config_module (static) > logio_module (static) > version_module (static) > unixd_module (static) > access_compat_module (shared) > alias_module (shared) > auth_basic_module (shared) > authn_core_module (shared) > authn_file_module (shared) > authz_core_module (shared) > authz_host_module (shared) > authz_user_module (shared) > autoindex_module (shared) > deflate_module (shared) > dir_module (shared) > env_module (shared) > filter_module (shared) > lbmethod_byrequests_module (shared) > mime_module (shared) > mpm_event_module (shared) > negotiation_module (shared) > proxy_module (shared) > proxy_balancer_module (shared) > proxy_http_module (shared) > reqtimeout_module (shared) > setenvif_module (shared) > slotmem_shm_module (shared) > status_module (shared) > > > Apache loaded modules in node1: > core_module (static) > so_module (static) > watchdog_module (static) > http_module (static) > log_config_module (static) > logio_module (static) > version_module (static) > unixd_module (static) > access_compat_module (shared) > alias_module (shared) > auth_basic_module (shared) > authn_core_module (shared) > authn_file_module (shared) > authz_core_module (shared) > authz_host_module (shared) > authz_user_module (shared) > autoindex_module (shared) > deflate_module (shared) > dir_module (shared) > env_module (shared) > filter_module (shared) > mime_module (shared) > mpm_event_module (shared) > negotiation_module (shared) > proxy_module (shared) > proxy_balancer_module (shared) > proxy_http_module (shared) > reqtimeout_module (shared) > setenvif_module (shared) > slotmem_shm_module (shared) > status_module (shared) > > Apache loaded modules in node2: > core_module (static) > so_module (static) > watchdog_module (static) > http_module (static) > log_config_module (static) > logio_module (static) > version_module (static) > unixd_module (static) > access_compat_module (shared) > alias_module (shared) > auth_basic_module (shared) > authn_core_module (shared) > authn_file_module (shared) > authz_core_module (shared) > authz_host_module (shared) > authz_user_module (shared) > autoindex_module (shared) > deflate_module (shared) > dir_module (shared) > env_module (shared) > filter_module (shared) > mime_module (shared) > mpm_event_module (shared) > negotiation_module (shared) > proxy_module (shared) > proxy_balancer_module (shared) > proxy_http_module (shared) > reqtimeout_module (shared) > setenvif_module (shared) > slotmem_shm_module (shared) > status_module (shared) > > Results when I run 'ab -k -n 10000 -c 1000 > http://vm_host_ip_address:8010/' with no balancer... > Finished 10000 requests > Server Software: Apache/2.4.41 > Server Hostname: 192.168.68.210 > Server Port: 8010 > Document Path: / > Document Length: 97098 bytes > Concurrency Level: 1000 > Time taken for tests: 24.029 seconds > Complete requests: 10000 > Failed requests: 5526 > (Connect: 0, Receive: 0, Length: 5526, Exceptions: 0) > Keep-Alive requests: 8938 > Total transferred: 870844342 bytes > HTML transferred: 868062523 bytes > Requests per second: 416.16 [#/sec] (mean) > Time per request: 2402.908 [ms] (mean) > Time per request: 2.403 [ms] (mean, across all concurrent requests) > Transfer rate: 35391.87 [Kbytes/sec] received > Connection Times (ms) > min mean[+/-sd] median max > Connect: 0 22 144.2 0 1039 > Processing: 0 1087 2291.1 451 18504 > Waiting: 0 1207 2615.1 426 18470 > Total: 0 1109 2372.3 451 19514 > Percentage of the requests served within a certain time (ms) > 50% 451 > 66% 585 > 75% 678 > 80% 764 > 90% 1868 > 95% 7315 > 98% 10098 > 99% 11156 > 100% 19514 (longest request) > Finished 10000 requests > > > > > > > No changes on vhost configuration file... > > <VirtualHost *:80> > ServerAdmin webmaster@localhost > DocumentRoot /var/www/html > > ErrorLog ${APACHE_LOG_DIR}/error.log > CustomLog ${APACHE_LOG_DIR}/access.log combined > </VirtualHost> > > > > > > > Results when I run 'ab -k -n 10000 -c 1000 > http://vm_host_ip_address:8010/' with balancer configured... > Finished 10000 requests > Server Software: Apache/2.4.41 > Server Hostname: 192.168.68.210 > Server Port: 8010 > Document Path: / > Document Length: 97098 bytes > Concurrency Level: 1000 > Time taken for tests: 15.527 seconds > Complete requests: 10000 > Failed requests: 834 > (Connect: 0, Receive: 0, Length: 834, Exceptions: 0) > Keep-Alive requests: 9166 > Total transferred: 892851836 bytes > HTML transferred: 890000268 bytes > Requests per second: 644.04 [#/sec] (mean) > Time per request: 1552.701 [ms] (mean) > Time per request: 1.553 [ms] (mean, across all concurrent requests) > Transfer rate: 56155.42 [Kbytes/sec] received > Connection Times (ms) > min mean[+/-sd] median max > Connect: 0 22 146.6 0 1038 > Processing: 0 657 1668.1 122 13453 > Waiting: 0 752 1883.8 121 13453 > Total: 0 679 1763.1 122 14476 > Percentage of the requests served within a certain time (ms) > 50% 122 > 66% 234 > 75% 330 > 80% 402 > 90% 1657 > 95% 4987 > 98% 7221 > 99% 8733 > 100% 14476 (longest request) > Finished 10000 requests > > > > I replaced the apache vhost config file with... > > <Proxy balancer://mycluster> > BalancerMember http://vm_host_ip_address:8011 > BalancerMember http://vm_host_ip_address:8012 > </Proxy> > ProxyPreserveHost On > ProxyPass / balancer://mycluster/ > ProxyPassReverse / balancer://mycluster/ > > > > > The index.html file is a 90KB plain text file for both node1 and node2 > > I'm missing something? > > The problem is the way virtualbox handles this network configuration and > in a real world the results would be different? > > > -- > Marc Serra > > > > > *Manxa 1876, S.L. 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