Comments on: What is the difference between a process and a thread? http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/ Best Source for Online LoadRunner Training Wed, 18 Jan 2012 05:21:31 +0000 hourly 1 By: sivakrishna http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-1475 sivakrishna Thu, 10 Nov 2011 10:11:10 +0000 http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-1475 great work great work

]]> By: sagar http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-1424 sagar Thu, 14 Jul 2011 07:32:09 +0000 http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-1424 An executing instance of a program is called a process. Some operating systems use the term ‘task‘ to refer to a program that is being executed. A process is always stored in the main memory also termed as the primary memory or random access memory. A thread is a subset of the process. It is termed as a ‘lightweight process’, since it is similar to a real process but executes within the context of a process and shares the same resources allotted to the process by the kernel (See kquest.co.cc/2010/03/operating-system for more info on the term ‘kernel’). Usually, a process has only one thread of control – one set of machine instructions executing at a time. An executing instance of a program is called a process.
Some operating systems use the term ‘task‘ to refer to a program that is being executed.
A process is always stored in the main memory also termed as the primary memory or random access memory.

A thread is a subset of the process.
It is termed as a ‘lightweight process’, since it is similar to a real process but executes within the context of a process and shares the same resources allotted to the process by the kernel (See kquest.co.cc/2010/03/operating-system for more info on the term ‘kernel’).
Usually, a process has only one thread of control – one set of machine instructions executing at a time.

]]> By: Alamgir http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-1423 Alamgir Thu, 14 Jul 2011 07:27:26 +0000 http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-1423 Nice Topic.Really enjoyable Nice Topic.Really enjoyable

]]> By: Neeraj http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-472 Neeraj Wed, 11 May 2011 10:26:49 +0000 http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-472 Hi, "why a process might be better for system stability than a thread?" During the load/performance testing Vusers are the virtual users that might use the system at certain pace at certain interval. And Comming to actual scenario actual user actions would work as a process on the system under test. So to simulate more closely to actual environment and take the system to better stability issues it is always better to use Vuser as process. Regards, Hi,
“why a process might be better for system stability than a thread?”
During the load/performance testing Vusers are the virtual users that might use the system at certain pace at certain interval. And Comming to actual scenario actual user actions would work as a process on the system under test. So to simulate more closely to actual environment and take the system to better stability issues it is always better to use Vuser as process.
Regards,

]]> By: yogaraj http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-445 yogaraj Fri, 04 Mar 2011 14:21:33 +0000 http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-445 hey what s actually difference between magentproc.exe and magentservice.exe can u pls explain?? i am beginner in load runner hey what s actually difference between magentproc.exe and magentservice.exe
can u pls explain?? i am beginner in load runner

]]> By: Devon McCormick http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-255 Devon McCormick Thu, 23 Sep 2010 13:11:52 +0000 http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-255 I found this discussion while figuring out what "mmdrv" is because I came in this morning to find an error message from this process - I had left a long-running VuGen overnight. Just to answer the above question about why a process might be better for system stability than a thread - which was hinted at in the previous reply - a mal-functioning thread can freeze or take down the entire process, along with any other threads in it, whereas a mal-functioning process only hurts itself. Thanks for the insight into LoadRunner. I found this discussion while figuring out what “mmdrv” is because I came in this morning to find an error message from this process – I had left a long-running VuGen overnight.

Just to answer the above question about why a process might be better for system stability than a thread – which was hinted at in the previous reply – a mal-functioning thread can freeze or take down the entire process, along with any other threads in it, whereas a mal-functioning process only hurts itself.

Thanks for the insight into LoadRunner.

]]> By: Ivo Plamenov http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-176 Ivo Plamenov Wed, 04 Nov 2009 10:57:37 +0000 http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-176 The decision whether to run Vusers as separate processes rather than threads in a process is connected with the concept of thread safety. When a multi-threaded application (in our case the Vuser script) is executed, all threads execute simultaneously in a shared address space and each thread has access to nearly all the memory of every other thread. Thus, when a large number of Vusers is run, side effects can appear if non thread-safe procedures are used in the Vuser code. In this case Vusers have to be run as separate processes. Further information regarding the Vuser thread safety can be found in the LoadRunner documentation. I myself have seen functions in the Function Reference that are explicitly marked as not thread-safe under certain circumstances. For example, under Unix, strftime is not thread-safe. The decision whether to run Vusers as separate processes rather than threads in a process is connected with the concept of thread safety. When a multi-threaded application (in our case the Vuser script) is executed, all threads execute simultaneously in a shared address space and each thread has access to nearly all the memory of every other thread. Thus, when a large number of Vusers is run, side effects can appear if non thread-safe procedures are used in the Vuser code. In this case Vusers have to be run as separate processes.

Further information regarding the Vuser thread safety can be found in the LoadRunner documentation. I myself have seen functions in the Function Reference that are explicitly marked as not thread-safe under certain circumstances. For example, under Unix, strftime is not thread-safe.

]]> By: Hydrolyze http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-170 Hydrolyze Fri, 16 Oct 2009 01:55:24 +0000 http://learnloadrunner.com/introduction/process-vs-thread-loadrunner/#comment-170 Just wanted to say hello all. This is my first post. I would like to learn alot here. Just wanted to say hello all. This is my first post.

I would like to learn alot here.

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