* Storing specified variables in the same memory page! @ 2004-10-11 15:53 Vinay 2004-10-11 15:57 ` Sriharsha Vedurmudi 0 siblings, 1 reply; 8+ messages in thread From: Vinay @ 2004-10-11 15:53 UTC (permalink / raw) To: gcc-help Hi, I would like to know if there is any way by which I can inform the compiler to store certain variables in the same memory page. This would really help my project. If not possible, is there a way to change the source code of GCC to implement the same. Thanks, Vinay ________________________________________________________________________ Yahoo! India Matrimony: Find your life partner online Go to: http://yahoo.shaadi.com/india-matrimony ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Storing specified variables in the same memory page! 2004-10-11 15:53 Storing specified variables in the same memory page! Vinay @ 2004-10-11 15:57 ` Sriharsha Vedurmudi 2004-10-11 16:08 ` Vinay 0 siblings, 1 reply; 8+ messages in thread From: Sriharsha Vedurmudi @ 2004-10-11 15:57 UTC (permalink / raw) To: Vinay; +Cc: gcc Will global/static variables not be stored stored consistantly in one page? -Harsha Vinay wrote: >Hi, > >I would like to know if there is any way by which I >can inform the compiler to store certain variables in >the same memory page. This would really help my >project. If not possible, is there a way to change the >source code of GCC to implement the same. > >Thanks, >Vinay > >________________________________________________________________________ >Yahoo! India Matrimony: Find your life partner online >Go to: http://yahoo.shaadi.com/india-matrimony > > -- ***************************** * Sriharsha Vedurmudi * Software Engineer * * Redpine Signals Inc. * Gate #395, Plot 87,88 * Sagar Society, Road #2, * Banjara Hills, * Hyderabad - 500 034 * www.redpinesignals.com * * +91-40-23559911 (Office) * +91-9849133133 (Mobile) ***************************** ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Storing specified variables in the same memory page! 2004-10-11 15:57 ` Sriharsha Vedurmudi @ 2004-10-11 16:08 ` Vinay 2004-10-13 8:51 ` energon 0 siblings, 1 reply; 8+ messages in thread From: Vinay @ 2004-10-11 16:08 UTC (permalink / raw) To: Sriharsha Vedurmudi; +Cc: gcc-help Hi Harsha, But the variables I would like to specify can be local also. I need a way by which I can specify any type of variable and they must be stored in the same memory page. Thanks, Vinay --- Sriharsha Vedurmudi <sriharsha.v@redpinesignals.com> wrote: > Will global/static variables not be stored stored > consistantly in one page? > > -Harsha > > Vinay wrote: > > >Hi, > > > >I would like to know if there is any way by which I > >can inform the compiler to store certain variables > in > >the same memory page. This would really help my > >project. If not possible, is there a way to change > the > >source code of GCC to implement the same. > > > >Thanks, > >Vinay > > > >________________________________________________________________________ > >Yahoo! India Matrimony: Find your life partner > online > >Go to: http://yahoo.shaadi.com/india-matrimony > > > > > > -- > ***************************** > * Sriharsha Vedurmudi > * Software Engineer > * > * Redpine Signals Inc. > * Gate #395, Plot 87,88 > * Sagar Society, Road #2, > * Banjara Hills, > * Hyderabad - 500 034 > * www.redpinesignals.com > * > * +91-40-23559911 (Office) > * +91-9849133133 (Mobile) > ***************************** > > ________________________________________________________________________ Yahoo! India Matrimony: Find your life partner online Go to: http://yahoo.shaadi.com/india-matrimony ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: Storing specified variables in the same memory page! 2004-10-11 16:08 ` Vinay @ 2004-10-13 8:51 ` energon 2004-10-13 18:49 ` (Question reframed)Storing " Vinay 0 siblings, 1 reply; 8+ messages in thread From: energon @ 2004-10-13 8:51 UTC (permalink / raw) To: gcc-help; +Cc: Vinay, Sriharsha Vedurmudi Well, you can define a struct with the necessary variable types and allocate some shared memory and map the struct into the shared memory. Typically, shared memory is allocated in size of page size chunks. So, if your data set size does not span the memory page size, you'll have your data in one page. Do you need to avoid your data from being paged out of the RAM? ===== -energon0 _______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: (Question reframed)Storing specified variables in the same memory page! 2004-10-13 8:51 ` energon @ 2004-10-13 18:49 ` Vinay 2004-10-13 18:59 ` Eljay Love-Jensen 2004-10-14 5:13 ` Sriharsha Vedurmudi 0 siblings, 2 replies; 8+ messages in thread From: Vinay @ 2004-10-13 18:49 UTC (permalink / raw) To: gcc-help Hello all, Thank you very much for all your replies. But the project requirements are different. The problem is as follows. A main program shall be running. An user source program is given as input to the main program. Along with the source program, some variables present in the source program shall also be specified. From the main program, I need to inform the compiler to allocate successive memory locations for these variables so that they reside on the same memory page. The main program is not allowed to change the type of the variables. Please give suggestions. Thanks, Vinay --- energon <energon0@yahoo.com> wrote: > > Well, you can define a struct with the necessary > variable types and > allocate some shared memory and map the struct into > the shared memory. > > Typically, shared memory is allocated in size of > page size chunks. > So, if your data set size does not span the memory > page size, you'll > have your data in one page. > > Do you need to avoid your data from being paged out > of the RAM? > > > ===== > -energon0 > > > > _______________________________ > Do you Yahoo!? > Declare Yourself - Register online to vote today! > http://vote.yahoo.com > ________________________________________________________________________ Yahoo! India Matrimony: Find your life partner online Go to: http://yahoo.shaadi.com/india-matrimony ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: (Question reframed)Storing specified variables in the same memory page! 2004-10-13 18:49 ` (Question reframed)Storing " Vinay @ 2004-10-13 18:59 ` Eljay Love-Jensen 2004-10-14 5:13 ` Sriharsha Vedurmudi 1 sibling, 0 replies; 8+ messages in thread From: Eljay Love-Jensen @ 2004-10-13 18:59 UTC (permalink / raw) To: Vinay, gcc-help Hi Vinay, Before worrying about this memory optimization, first get the program to work the normal way. Then, after the program is working, try to optimize the variable placement by allocating a chunk of memory. Put the variables in that allocated memory chunk. HTH, --Eljay ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: (Question reframed)Storing specified variables in the same memory page! 2004-10-13 18:49 ` (Question reframed)Storing " Vinay 2004-10-13 18:59 ` Eljay Love-Jensen @ 2004-10-14 5:13 ` Sriharsha Vedurmudi 2004-10-15 13:29 ` energon 1 sibling, 1 reply; 8+ messages in thread From: Sriharsha Vedurmudi @ 2004-10-14 5:13 UTC (permalink / raw) To: Vinay; +Cc: gcc Hi Vinay, is your aim something like an intelligent program editor where-in you write a program and execute the 'compile' option in the editor. Here the editor picks up the source program and passes it on to the compiler for compilation. The extra functionality you need is that some of the variables that are explicitly specified should be allocated in contiguous/successive memory locations? Is it? Well, I am not aware of any such options for gcc atleast, but I feel that such things are to be taken care in the source program itself. Encapsulate them in a structure, as suggested earlier. Still I wonder why you would want them on a same memory page? Is it purely for speed optimization? Regards, Harsha. Vinay wrote: >Hello all, > >Thank you very much for all your replies. But the >project requirements are different. The problem is as >follows. > >A main program shall be running. An user source >program is given as input to the main program. Along >with the source program, some variables present in the >source program shall also be specified. From the main >program, I need to inform the compiler to allocate >successive memory locations for these variables so >that they reside on the same memory page. > >The main program is not allowed to change the type of >the variables. > >Please give suggestions. > >Thanks, >Vinay >--- energon <energon0@yahoo.com> wrote: > > >>Well, you can define a struct with the necessary >>variable types and >>allocate some shared memory and map the struct into >>the shared memory. >> >>Typically, shared memory is allocated in size of >>page size chunks. >>So, if your data set size does not span the memory >>page size, you'll >>have your data in one page. >> >>Do you need to avoid your data from being paged out >>of the RAM? >> >> >>===== >>-energon0 >> >> >> >>_______________________________ >>Do you Yahoo!? >>Declare Yourself - Register online to vote today! >>http://vote.yahoo.com >> >> >> > >________________________________________________________________________ >Yahoo! India Matrimony: Find your life partner online >Go to: http://yahoo.shaadi.com/india-matrimony > > -- ***************************** * Sriharsha Vedurmudi * Software Engineer * * Redpine Signals Inc. * Gate #395, Plot 87,88 * Sagar Society, Road #2, * Banjara Hills, * Hyderabad - 500 034 * www.redpinesignals.com * * +91-40-23559911 (Office) * +91-9849133133 (Mobile) ***************************** ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: (Question reframed)Storing specified variables in the same memory page! 2004-10-14 5:13 ` Sriharsha Vedurmudi @ 2004-10-15 13:29 ` energon 0 siblings, 0 replies; 8+ messages in thread From: energon @ 2004-10-15 13:29 UTC (permalink / raw) To: Sriharsha Vedurmudi; +Cc: gcc-help 1. or maybe, tag your variables with a specific tag, 2. a. then write a filter program to generate code with a struct getting populated with the specially tagged variables as members b. then map accesses to the tagged variables as members of the struct c. the memory for the struct could be on the stack or the heap, and the code generated appropriately 3. then pass this generated code to the actual GCC ===== -energon0 _______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2004-10-15 13:29 UTC | newest] Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2004-10-11 15:53 Storing specified variables in the same memory page! Vinay 2004-10-11 15:57 ` Sriharsha Vedurmudi 2004-10-11 16:08 ` Vinay 2004-10-13 8:51 ` energon 2004-10-13 18:49 ` (Question reframed)Storing " Vinay 2004-10-13 18:59 ` Eljay Love-Jensen 2004-10-14 5:13 ` Sriharsha Vedurmudi 2004-10-15 13:29 ` energon
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