Configuring and testing litespeed cache Part 1

[eva2000]

Just tried adding

RewriteEngine on
RewriteRule test.php - [E=Cache-Control:max-age=45]

still doesn't cache anything if CacheEnable disk / is removed

AND

caches both test.php and testnocache.php when CacheEnable disk / is added back in

[mistwang]

Please upgrade to 4.0.19 if have not yet, and try again.
If still not working, need to enable debug logging and rewritelog to figure out what is wrong.
I wonder if .htaccess is working properly or not.

[eva2000]

still on 4.0.18, but found a configuration which works to cache only test.php but not testnocache.php

htaccess

RewriteEngine on
RewriteRule test.php - [E=Cache-Control:max-age=45]

cache policy set to

Enable Cache:Not set
Cache Expire Time (seconds): 120
Cache Request with Query String:Not set
Cache Request with Cookie:Not set
Cache Response with Cookie:Not set
Ignore Request Cache-Control:Not set
Ignore Response Cache-Control:Not set

httpd.conf set to

#disk cache
<IfModule mod_cache.c>
<IfModule mod_disk_cache.c>
CacheRoot /lscache/   
#CacheEnable disk /  
</IfModule>
</IfModule>

testnocache.php

Server Software:        LiteSpeed
Server Hostname:        192.168.56.101
Server Port:            80

Document Path:          /testnocache.php
Document Length:        63 bytes

Concurrency Level:      200
Time taken for tests:   0.201163 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      286000 bytes
HTML transferred:       63000 bytes
Requests per second:    4971.09 [#/sec] (mean)
Time per request:       40.233 [ms] (mean)
Time per request:       0.201 [ms] (mean, across all concurrent requests)
Transfer rate:          1386.94 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0   17  11.3     17      40
Processing:     5   21   7.1     21      66
Waiting:        0   14   9.0     15      59
Total:          5   38   8.6     38      80

Percentage of the requests served within a certain time (ms)
  50%     38
  66%     42
  75%     44
  80%     45
  90%     47
  95%     49
  98%     51
  99%     74
 100%     80 (longest request)

ls -alhR
.:
total 12K
drwxrwxrwx  2 nobody nobody 4.0K Jan 21 10:10 .
drwxr-xr-x 25 root   root   4.0K Jan 21 10:03 ..

test.php properly cached

ab -n 1000 -c 200 192.168.56.101/test.php
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/

Benchmarking 192.168.56.101 (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Finished 1000 requests


Server Software:        LiteSpeed
Server Hostname:        192.168.56.101
Server Port:            80

Document Path:          /test.php
Document Length:        63 bytes

Concurrency Level:      200
Time taken for tests:   0.61408 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      287144 bytes
HTML transferred:       63252 bytes
Requests per second:    16284.52 [#/sec] (mean)
Time per request:       12.282 [ms] (mean)
Time per request:       0.061 [ms] (mean, across all concurrent requests)
Transfer rate:          4559.67 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    2   2.2      2       9
Processing:     3    8   2.5      9      16
Waiting:        1    3   1.5      3       9
Total:          3   10   3.1     11      22

Percentage of the requests served within a certain time (ms)
  50%     11
  66%     12
  75%     13
  80%     13
  90%     14
  95%     15
  98%     17
  99%     18
 100%     22 (longest request)

ls -alhR
.:
total 16K
drwxrwxrwx  3 nobody nobody 4.0K Jan 21 10:16 .
drwxr-xr-x 25 root   root   4.0K Jan 21 10:03 ..
drwx------  3 nobody nobody 4.0K Jan 21 10:16 9

./9:
total 12K
drwx------ 3 nobody nobody 4.0K Jan 21 10:16 .
drwxrwxrwx 3 nobody nobody 4.0K Jan 21 10:16 ..
drwx------ 3 nobody nobody 4.0K Jan 21 10:16 f

./9/f:
total 12K
drwx------ 3 nobody nobody 4.0K Jan 21 10:16 .
drwx------ 3 nobody nobody 4.0K Jan 21 10:16 ..
drwx------ 2 nobody nobody 4.0K Jan 21 10:16 2

./9/f/2:
total 12K
drwx------ 2 nobody nobody 4.0K Jan 21 10:16 .
drwx------ 3 nobody nobody 4.0K Jan 21 10:16 ..
-rw------- 1 nobody nobody  215 Jan 21 10:16 9f283728

[NiteWave]

per your testing on 4.0.18, it looks like set
CacheRoot /lscache/
in httpd.conf is not same as setting CacheRoot at admin console.
and as I tested, without "CacheRoot /lscache/" in httpd.conf, but set it in admin console, rewriterule + cache will work. so it looks that
"CacheRoot /lscache/" in httpd.conf +
set "Cache Expire Time" in admin console can enable "rewriterule + cache"

this should not be designed behavior and complicated to users. please try 4.0.19 to see if this has been fixed.

[eva2000]

K thanks will try 4.0.19 later, need to get some sleep

Interesting notes

1. tuning varnish from default gives an extra ~500 rps.
2. raising apachebench concurrency from 200 to 400, litespeed cache still pushes out consistent 16k rps vs varnish which drops to under 9k rps. But pushing concurrency from 200 to 600, has the situation reversed with litespeed cache dropping from 1st, 2nd and 3rd run = 16k, 11k, down to just 330 rps on 3rd run (disk i/o ?) vs varnish dropping to consistent 7.5k rps.

will update to 4.0.19 later tonight

[mistwang]

Originally Posted by eva2000

2. raising apachebench concurrency from 200 to 400, litespeed cache still pushes out consistent 16k rps vs varnish which drops to under 9k rps. But pushing concurrency from 200 to 600, has the situation reversed with litespeed cache dropping from 1st, 2nd and 3rd run = 16k, 11k, down to just 330 rps on 3rd run (disk i/o ?) vs varnish dropping to consistent 7.5k rps.

Likely a problem with kernel socket limits, there should not be big differences when you run the benchmark test multiple times.

Try adding "-k" option to "ab".

[eva2000]

Ah, seems I have apache keepalives off and apachebench was run without keepalives, so will have to redo some tests :o

[eva2000]

Good news Litespeed 4.0.19 fixed the cache settings issue, now test.php gets cached while testnocache.php doesn't get cached with cache policy in 4.0.19 set as per below settings.

test.php header

view source
Content-Encoding	gzip
Vary	Accept-Encoding
Date	Fri, 21 Jan 2011 20:54:52 GMT
Server	LiteSpeed
Connection	Keep-Alive
Keep-Alive	timeout=5, max=100
X-LiteSpeed-Cache	hit
Content-Length	79
X-Powered-By	PHP/5.3.5
CurrentTime	Fri, 21 Jan 2011 20:54:34 GMT
Content-Type	text/html; charset=UTF-8

testnocache.php header

Content-Encoding	gzip
Vary	Accept-Encoding
Date	Fri, 21 Jan 2011 20:54:59 GMT
Server	LiteSpeed
Connection	Keep-Alive
Keep-Alive	timeout=5, max=100
X-Powered-By	PHP/5.3.5
CurrentTime	Fri, 21 Jan 2011 20:54:59 GMT
Content-Type	text/html; charset=UTF-8
Content-Length	79

test.php

 ab -k -n 1000 -c 200 192.168.56.101/test.php
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/

Benchmarking 192.168.56.101 (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Finished 1000 requests


Server Software:        LiteSpeed
Server Hostname:        192.168.56.101
Server Port:            80

Document Path:          /test.php
Document Length:        63 bytes

Concurrency Level:      200
Time taken for tests:   0.42640 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Keep-Alive requests:    1000
Total transferred:      346952 bytes
HTML transferred:       63000 bytes
Requests per second:    23452.16 [#/sec] (mean)
Time per request:       8.528 [ms] (mean)
Time per request:       0.043 [ms] (mean, across all concurrent requests)
Transfer rate:          7926.83 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   1.6      0       6
Processing:     0    2   1.0      3       5
Waiting:        0    2   1.0      3       5
Total:          0    3   1.5      3      11

Percentage of the requests served within a certain time (ms)
  50&#37;      3
  66%      3
  75%      3
  80%      3
  90%      6
  95%      7
  98%      8
  99%      8
 100%     11 (longest request)

testnocache.php

ab -k -n 1000 -c 200 192.168.56.101/testnocache.php
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/

Benchmarking 192.168.56.101 (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Finished 1000 requests


Server Software:        LiteSpeed
Server Hostname:        192.168.56.101
Server Port:            80

Document Path:          /testnocache.php
Document Length:        63 bytes

Concurrency Level:      200
Time taken for tests:   0.184258 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Keep-Alive requests:    1000
Total transferred:      323000 bytes
HTML transferred:       63000 bytes
Requests per second:    5427.17 [#/sec] (mean)
Time per request:       36.852 [ms] (mean)
Time per request:       0.184 [ms] (mean, across all concurrent requests)
Transfer rate:          1709.56 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   1.5      0       6
Processing:    20   28  14.6     21      89
Waiting:       20   28  14.4     21      88
Total:         20   29  15.7     21      89

Percentage of the requests served within a certain time (ms)
  50%     21
  66%     26
  75%     27
  80%     28
  90%     59
  95%     67
  98%     72
  99%     83
 100%     89 (longest request)

The test.php and testnocache.php file used contains

<?php
header('CurrentTime: '.gmdate('D, d M Y H:i:s', time()).' GMT',true);

echo "time()=" . time() . "<br>";
echo "date()=" . date(DATE_RFC822) ."<br>";
?>

Apache httpd.conf contains

#disk cache
<IfModule mod_cache.c>
<IfModule mod_disk_cache.c>
CacheRoot /lscache/   
#CacheEnable disk /  
</IfModule>
</IfModule>

Litespeed 4.0.18 cache policy is set to

Enable Cache:No
Cache Request with Query String:Yes
Cache Request with Cookie:Yes
Cache Response with Cookie:Yes
Ignore Request Cache-Control:Yes
Ignore Response Cache-Control:Yes

.htaccess used

RewriteEngine on
RewriteRule test.php - [E=Cache-Control:max-age=45]