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https://issues.apache.org/jira/browse/SLING-913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14050497#comment-14050497
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Chetan Mehrotra commented on SLING-913:
---------------------------------------
Ran the Apache Benchmark [1] after installing the espblog sample. Following
command was used
bq. ab -k -n 100 -c 20 -A admin:admin
http://localhost:8080/content/espblog/*.html
*Default*
{noformat}
Benchmarking localhost (be patient).....done
Server Software: Jetty(7.x.y-SNAPSHOT)
Server Hostname: localhost
Server Port: 8080
Document Path: /content/espblog/*.html
Document Length: 1317 bytes
Concurrency Level: 20
Time taken for tests: 0.945 seconds
Complete requests: 100
Failed requests: 0
Write errors: 0
Keep-Alive requests: 100
Total transferred: 148900 bytes
HTML transferred: 131700 bytes
Requests per second: 105.87 [#/sec] (mean)
Time per request: 188.916 [ms] (mean)
Time per request: 9.446 [ms] (mean, across all concurrent requests)
Transfer rate: 153.94 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.3 0 1
Processing: 61 183 105.4 164 899
Waiting: 61 183 105.4 164 899
Total: 61 183 105.5 164 900
Percentage of the requests served within a certain time (ms)
50% 164
66% 191
75% 211
80% 237
90% 254
95% 283
98% 713
99% 900
100% 900 (longest request)
{noformat}
*With Script Cache*
{noformat}
Server Software: Jetty(7.x.y-SNAPSHOT)
Server Hostname: localhost
Server Port: 8080
Document Path: /content/espblog/*.html
Document Length: 1317 bytes
Concurrency Level: 20
Time taken for tests: 0.350 seconds
Complete requests: 100
Failed requests: 0
Write errors: 0
Keep-Alive requests: 100
Total transferred: 148900 bytes
HTML transferred: 131700 bytes
Requests per second: 285.61 [#/sec] (mean)
Time per request: 70.025 [ms] (mean)
Time per request: 3.501 [ms] (mean, across all concurrent requests)
Transfer rate: 415.31 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.3 0 1
Processing: 13 67 36.7 57 202
Waiting: 13 67 36.7 57 202
Total: 13 67 36.9 57 203
Percentage of the requests served within a certain time (ms)
50% 57
66% 76
75% 86
80% 99
90% 125
95% 137
98% 168
99% 203
100% 203 (longest request)
{noformat}
So the Request per second (TPS) jumps from 105 to 285 indicating the caching of
scripts should give improved performance
[1] http://httpd.apache.org/docs/2.2/programs/ab.html
> Add a cache for pre-compiled scripts
> ------------------------------------
>
> Key: SLING-913
> URL: https://issues.apache.org/jira/browse/SLING-913
> Project: Sling
> Issue Type: New Feature
> Components: Scripting
> Affects Versions: Scripting Core 2.0.2
> Reporter: Felix Meschberger
> Attachments: SLING-913.patch
>
>
> The Java Scripting API provides support for scripting langugages which may
> precompile script source and reuse the precompiled scripts:
> javax.script.Compilable: May be implemented by a ScriptEngine if
> precompilation is
> supported
> javax.script.CompiledScript: Result of calling the Compilable.compile
> method.
> The CompiledScript can be called to repeatedly execute the script without the
> need for recompilation and thus for improved performance.
> The Sling Core Scripting support should make use of this functionality by
> maintaining a cache compiled scripts with the following properties
> * indexed by script path
> * size limited (using LinkedHashMap overwriting the removeEldestEntry
> method)
> * entries are weak or soft references ot cache entries
> A cache entry consists of the following information:
> * The CompiledScript instance
> * The time of last compilation. this is compared to the last modification
> time of the script to decide on whether to recompile
> We might probaly also try to add a reference to the script engine
> implementation bundle to only use the cache entry if the bundle has not been
> stopped since adding the cache entry
> Executing the script would then consist of the following steps:
> 1 Check the cache of precompiled scripts. if an entry exists and can be
> used, use it
> 2. if the ScriptEngine is Compilable:
> 2a. Compile the script and add it to the cache and use it
> 2b. Otherwise have the script engine execute the script
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