Tunning JVM

JuanDaniel — Mon, 07 May 2018 08:28:32 GMT

Hi masters!

Some days ago i have problems with SASServer1_1 and i solved the problems updating the JVM parameters, but, which are the best parameters o how can i adjust this parameters correctly?

Kind regards

Re: Tunning JVM

JuanS_OCS — Mon, 07 May 2018 08:54:46 GMT

Hello @JuanDaniel,

your first reference should be this one, maintained by SAS: https://support.sas.com/documentation/cdl/en/appsrvtuning/69859/HTML/default/viewer.htm#p1tpeih89ioi0in1pc7bg9cyqzuo.htm

At this moment the advise is this one:

SASServer1 Settings
Platform	Server Size	Option	Recommended Value
HP-UX, Linux, Solaris, and Windows	Small	`-Xms` `-Xmx` `-XX:PermSize` `-XX:MaxPermSize`	`1024m` `3072m` `384m` `1024m`
	Medium	`-Xms` `-Xmx` `-XX:PermSize` `-XX:MaxPermSize`	`1024m` `4096m` `512m` `1024m`
	Large	`-Xms` `-Xmx` `-XX:PermSize` `-XX:MaxPermSize`	`4096m` `4096m` `1024m` `1024m`
AIX	Small	`-Xms` `-Xmx`	`1024m` `3072m`
	Medium	`-Xms` `-Xmx`	`1024m` `4096m`
	Large	`-Xms` `-Xmx`	`2048m` `4096m`
Additional JVM Args (all platforms)	Small	not applicable	not applicable
	Medium	not applicable	not applicable
	Large	-Dsas.svcs.http.max.total.connections	`512`
	Large	-Dsas.svcs.http.max.connections	`512`
SharedServices JDBC Resource	Small	maxPoolSize	`35`
	Medium	maxPoolSize	`100`
	Large	maxPoolSize	`256`
Tomcat Executor Thread Pool	Small	maxThreads	`150`
	Medium	maxThreads	`300`
	Large	maxThreads	`1024`

Check also the settings for the Web Server here:

https://support.sas.com/documentation/cdl/en/appsrvtuning/69859/HTML/default/viewer.htm#n0h4b6qexwe5h1n1v9xisqfxl84v.htm

SAS Web Server Settings
Platform	Server Size	Option	Recommended Value	Filename
Windows (mpm_winnt_module)	Small	`ThreadsPerChild`	`512`	`conf\extra\httpd-mpm.conf`
	Medium	`ThreadsPerChild`	`1024`	`conf\extra\httpd-mpm.conf`
	Large	`ThreadLimit`	`3072`	`conf\extra\httpd-mpm.conf`
		`ThreadsPerChild`	`3072`	`conf\extra\httpd-mpm.conf`
		`MaxKeepAliveRequests`	`0`	`conf\extra\httpd-default.conf`
UNIX and Linux (mpm_worker_module)	Small	`ServerLimit`	`16`	`conf/extra/httpd-mpm.conf`
		`MaxClients`	`512`	`conf/extra/httpd-mpm.conf`
		`ThreadsPerChild`	32	`conf/extra/httpd-mpm.conf`
	Medium	`ServerLimit`	32	`conf/extra/httpd-mpm.conf`
		`MaxClients`	1024	`conf/extra/httpd-mpm.conf`
		`ThreadsPerChild`	`32`	`conf/extra/httpd-mpm.conf`
	Large	`ServerLimit`	`96`	`conf/extra/httpd-mpm.conf`
		`MaxClients`	`3072`	`conf/extra/httpd-mpm.conf`
		`ThreadsPerChild`	`32`	`conf/extra/httpd-mpm.conf`
		`MaxKeepAliveRequests`	`0`	`conf/extra/httpd-default.conf`

In some cases, like when you enable the Auditing in SAS VA (Administrator Reports), and as consequence, the WIP tables grow, it is recommended by SAS Technical Support to increase a bit the -Xmx value, from 4 GB to even 20 GB in some cases. Anyway, I strongly recommend you to do this with previous consultation of SAS Technical Support and, for starters, just stick to the recommendations published in the online documentation.

Hope it helps,

Kind regards,

Juan

Re: Tunning JVM

JuanDaniel — Mon, 07 May 2018 09:01:27 GMT

thx @JuanS_OCS

I know this guide but sometimes are not the best configuration for ours environments. Are there any other way to afine this configuration?

Kind regards

Re: Tunning JVM

JuanS_OCS — Mon, 07 May 2018 09:07:06 GMT

Actually, yes, the best way is to analyse the requirements of your JVMs through getting to know better their requirements: if you analyse GC, heapsizes with the SAS Environment Manager, you will know where they are suffering and where you can help them to be healthier.

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