Scripting language performance

["He Yin (测试部_贺寅)" <he...@yihaodian.com>]

Hello,
  In another thread, I noticed Philippe mentioned that " JSR223 Samplers + Groovy  + Caching" is a better choice then Beanshell. Since I used a lot of Beanshell in my scripts and never pay attention to it, I decided to make  an investigation of this issue. 
  I simplified one of my beanshell script, rewrited it into groovy and rhino and put them into script-samplers instead of  pre-processors. 
The result turned out that 
1) Beanshell is better than other solutions
2) Groovy and javascript will cause some gc problems.
3) Groovy
3) BSF and JSR223 seems that waste some cpu time on their framework.

Am I  doing something wrong? 

(Thread:10, Loop 500)
Label	Samples	Average	Median	90%	Min	Max	Error%	Throughput	KB/sec	GC occurs
JSR223-groovy	5000	59	39	119	6	3077	0	145.2137546	0	1~2
JSR223-rhino	5000	2	1	2	0	314	0	851.9338899	0	frequently
BeanShell Sampler	5000	1	1	2	0	402	0	1068.832835	0	0
BSF-beanshell	5000	33	27	63	3	328	0	270.6506441	0	0
BSF-javascript	5000	20	6	44	1	640	0	324.7174958	12.68427718	frequently

Environments: JMeter 2.8, 
Uncomment " jsr223.compiled_scripts_cache_size" in jmeter.properties
Groovy version: groovy-all-2.0.6
JVM_OPTS:
  set HEAP=-Xms512m -Xmx512m
  set NEW=-XX:NewSize=128m -XX:MaxNewSize=128m
  set SURVIVOR=-XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=50%
  set TENURING=-XX:MaxTenuringThreshold=2
  set RMIGC=-Dsun.rmi.dgc.client.gcInterval=600000 -Dsun.rmi.dgc.server.gcInterval=600000
  set PERM=-XX:PermSize=64m -XX:MaxPermSize=64m

Script for Beanshell and groovy:
for (int i=0;i<10;i++){
  line="1027448,1".split(",");
  pid=line[0];
  mid=line[1];
  vars.put("pid"+i,pid);
  vars.put("mid"+i,mid);
}
cartParam="";
for (int i=0;i<10;i++){
  pid=vars.get("pid"+i);
  mid=vars.get("mid"+i);
  param=mid+"_"+pid+"_"+"0_0_1=1";
  if (cartParam=="")
    cartParam=param;
  else
    cartParam+=","+param;
}
vars.put("cartParam",cartParam);

Script for rhino and javascript:
for (var i=0;i<10;i++){
  line="1027448,1".split(",");
  pid=line[0];
  mid=line[1];
  vars.put("pid"+i,pid);
  vars.put("mid"+i,mid);
}
var cartParam="";
for (var i=0;i<10;i++){
  pid=vars.get("pid"+i);
  mid=vars.get("mid"+i);
  param=mid+"_"+pid+"_"+"0_0_1=1";
  if (cartParam=="")
    cartParam=param;
  else
    cartParam+=","+param;
}
vars.put("cartParam",cartParam);