A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_URI::$config is deprecated
Filename: core/URI.php
Line Number: 101
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Router::$uri is deprecated
Filename: core/Router.php
Line Number: 127
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$benchmark is deprecated
Filename: core/Controller.php
Line Number: 82
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$hooks is deprecated
Filename: core/Controller.php
Line Number: 82
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$config is deprecated
Filename: core/Controller.php
Line Number: 82
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$log is deprecated
Filename: core/Controller.php
Line Number: 82
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$utf8 is deprecated
Filename: core/Controller.php
Line Number: 82
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$uri is deprecated
Filename: core/Controller.php
Line Number: 82
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$exceptions is deprecated
Filename: core/Controller.php
Line Number: 82
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$router is deprecated
Filename: core/Controller.php
Line Number: 82
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$output is deprecated
Filename: core/Controller.php
Line Number: 82
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$security is deprecated
Filename: core/Controller.php
Line Number: 82
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$input is deprecated
Filename: core/Controller.php
Line Number: 82
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$lang is deprecated
Filename: core/Controller.php
Line Number: 82
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$db is deprecated
Filename: core/Loader.php
Line Number: 396
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_DB_mysqli_driver::$failover is deprecated
Filename: database/DB_driver.php
Line Number: 371
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Warning
Message: Trying to access array offset on true
Filename: libraries/Email.php
Line Number: 978
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$email is deprecated
Filename: core/Loader.php
Line Number: 1283
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Return type of CI_Session_files_driver::close() should either be compatible with SessionHandlerInterface::close(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
Filename: drivers/Session_files_driver.php
Line Number: 295
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Return type of CI_Session_files_driver::read($session_id) should either be compatible with SessionHandlerInterface::read(string $id): string|false, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
Filename: drivers/Session_files_driver.php
Line Number: 169
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Return type of CI_Session_files_driver::write($session_id, $session_data) should either be compatible with SessionHandlerInterface::write(string $id, string $data): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
Filename: drivers/Session_files_driver.php
Line Number: 238
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Return type of CI_Session_files_driver::destroy($session_id) should either be compatible with SessionHandlerInterface::destroy(string $id): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
Filename: drivers/Session_files_driver.php
Line Number: 318
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Return type of CI_Session_files_driver::gc($maxlifetime) should either be compatible with SessionHandlerInterface::gc(int $max_lifetime): int|false, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
Filename: drivers/Session_files_driver.php
Line Number: 359
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Warning
Message: ini_set(): Session ini settings cannot be changed after headers have already been sent
Filename: Session/Session.php
Line Number: 282
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Warning
Message: session_set_cookie_params(): Session cookie parameters cannot be changed after headers have already been sent
Filename: Session/Session.php
Line Number: 289
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Warning
Message: ini_set(): Session ini settings cannot be changed after headers have already been sent
Filename: Session/Session.php
Line Number: 304
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Warning
Message: ini_set(): Session ini settings cannot be changed after headers have already been sent
Filename: Session/Session.php
Line Number: 314
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Warning
Message: ini_set(): Session ini settings cannot be changed after headers have already been sent
Filename: Session/Session.php
Line Number: 315
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Warning
Message: ini_set(): Session ini settings cannot be changed after headers have already been sent
Filename: Session/Session.php
Line Number: 316
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Warning
Message: ini_set(): Session ini settings cannot be changed after headers have already been sent
Filename: Session/Session.php
Line Number: 317
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Warning
Message: ini_set(): Session ini settings cannot be changed after headers have already been sent
Filename: Session/Session.php
Line Number: 375
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Warning
Message: session_set_save_handler(): Session save handler cannot be changed after headers have already been sent
Filename: Session/Session.php
Line Number: 110
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: Warning
Message: session_start(): Session cannot be started after headers have already been sent
Filename: Session/Session.php
Line Number: 143
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$session is deprecated
Filename: core/Loader.php
Line Number: 1283
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property Blogs::$user_model is deprecated
Filename: core/Loader.php
Line Number: 358
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/User.php
Line: 7
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 8
Function: __construct
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$load is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$pgmodule is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$benchmark is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$hooks is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$config is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$log is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$utf8 is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$uri is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$exceptions is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$router is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$output is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$security is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$input is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$lang is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$db is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
Message: Creation of dynamic property CI_Loader::$email is deprecated
Filename: core/Loader.php
Line Number: 931
Backtrace:
File: /home1/biognosy/skmlhometuitions.in/application/controllers/Blogs.php
Line: 234
Function: view
File: /home1/biognosy/skmlhometuitions.in/index.php
Line: 315
Function: require_once
A PHP Error was encountered
Severity: 8192
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webMethods Memory Management and troubleshooting for WebMethods Servers | Post Details - SKML Home Tuitions
Memory Management And Troubleshooting For WebMethods Servers
A process in a 32 bit system only has access to 4GB of address space. Out of this, 1 GB is allocated to kernel space and 3 GB to user space in Linux based systems and 2GB/2GB for Windows based systems. See reference section for ways of expanding user space with both operating systems (OSs). Even with 3GB space in Linux (Redhat Enterprise 4) , access to Java object heap is limited to 1.6GB or 1.7GB while the rest is dedicated to non heap memory. You may able to start a server with Java heap as high as 2.3GB but donât expect the application to last long. Due to various activities in non heap memory space such as GC (Garbage Collection), Threads, byte code to native compilations etc., a server is likely to crash with a native memory error. Therefore, you need to strike a balance between adequate memory for the application to run without running out of heap memory and JVM to perform house keeping tasks without exhausting native memory space.
Here are some guidelines on managing memory requirements for webMethods servers (IS and MWS, 7.1.2) on 32 bit operating systems:
Know your application memory requirements . This is very important because people generally prefer to give as much memory as possible to Java heap. After all, giving more memory, surely will benefit performance. Right? Not quite. As outlined above, we are juggling with 3 / 2 GB of memory on a 32bit system and more heap memory means less native memory. Therefore, it is important to monitor the memory requirements for the application and allocate accordingly.
Use server class hardware to run servers . Hotspot server system is automatically detected on server class machines. The server system is optimal where overall performance is critical and client system is suitable for applications which require fast startup times or small footprints. Differences between the two systems include the compilation policy, heap defaults, and inlining policy. For instance, compiler threshold is 10000 for server mode and 1500 for client mode. The high threshold for server system is required for optimal optimization
Use JVM options . Use them with caution as they may have an adverse effect for inappropriate usage. Some useful options:
Java Heap size: -Xms and -Xmx
Perm memory: -XX:MaxPermSize
Young generation heap size: -XX:NewRatio
GC algorithm: e.g., -XX:+UseConcMarkSweepGC, -XX:+UseParNewGC
Dump heap on memory error: -XX:+HeapDumpOnOutOfMemoryError
Dump file: -XX:HeapDumpPath=xxx.hprof
Log GC (can view the output using GCViewer): -Xloggc:gc.log
Add time stamp to GC output: -XX:+PrintGCDetails
Start servers using nohup (Linux) . Errors such as native memory errors are not logged in application logs because the application never gets a chance to log them as the JVM is terminated prematurely. A server started with nohup command may able to log the cause for the the crash in nohup.out. However, for detailed errors, you should enable JVM with debugging options as discussed above. With MWS, use nohup on run.sh and not startup.sh as the latter redirects the output to PORTAL_CONSOLE variable defined in mws.sh
Restart may help . If the application is running just under the maximum limits, then a restart can help to avoid a crash. A restart resets compiled code and data gathered by Hotspot compiler for optimizations, thus effectively freeing up the native memory
Disable JIT compiler (-Djava.compiler=NONE) . This effectively runs the application in interpreter mode and hence the least efficient way to run an application. However, this could be a viable option for some applications where performance is not critical, for example nightly batch job (hopefully, it will end before the day break )
Beware of third party libraries . Uncaught errors in third party libraries could potentially crash the JVM. With java.nio package, itâs possible for a Java program to access Java native memory without using JNI, for example, java.nio.ByteBuffer.allocateDirect(â¦). If you suspect a JVM crash is due to a third party tool which is beyond your control, itâs worth running it in a separate JVM with a defined interface (e.g., webservice, socket protocol etc)
64-bit runtime . 64-bit OS can go a long way to address the memory issues but various posts highlighted 40%-50% increase in RAM to hold the same amount of data. This is mainly due to:
Extended instruction set
Increased object size (64-bit pointers)
Increased stack size
Monitoring tools . Use monitoring tools such as Hyperic to monitor JVM. If none is available, consider jconsole provided as part of JDK 5 or above as an alternative. To enable JMX capability, start JVM with the following option: java ⦠-Dcom.sun.management.jmxremote.port=3333 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false
Modify server.sh (IS) and mws.sh (MWS) accordingly. visualjvm provided as part of JDK 6 is another option worth considering. This tool relies on jstat daemon to autodetect JVMs running on a host. To start jstat daemon:
./jstatd -J-Djava.security.policy=jstatd.all.policy &
Other tools worth considering are:
jmap, e.g. jmap , jmap âheap
pmap (Linux)
top (Linux)
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