Hello,
I've compiled my app for AnyCPU setting in vs2005. Then I tried the app
on both 32-bit Windows 2003 R2 and 64-bit Windows 2003 R2. The memory
usage of the application when working on the same data set were
unbelievable (the data is from Task Manager) :
32-bit Windows 2003 R2
Mem Usage: 481,400k
Peak Mem: 583,020k
64-bit Windows 2003 R2
Mem Usage: 934,456k
Peak Mem: 1,254,008k
In other words, basically memory usage doubled. Now I can see that the
size of pointers would double, but most of the data is of type int,
short, string, etc... e.g. types that are the same size on 32 and 64 bit
machines (at least its c# aliases). The object model is pretty big and
it does have a lot of pointers to objects, but the size of the data
dwarfs the potential size of all the pointers, etc...
Why is difference so huge? Or am I measuring the wrong metrics here?
Regards
17  5697 
Frank Rizzo wrote:
32-bit Windows 2003 R2
Mem Usage: 481,400k
Peak Mem: 583,020k
64-bit Windows 2003 R2
Mem Usage: 934,456k
Peak Mem: 1,254,008k
Why is difference so huge? Or am I measuring the wrong metrics here?
Have you tried, e.g. SOS or a memory profiler and finding out what
instances are alive and taking up all the space?
-- Barry
-- http://barrkel.blogspot.com/
Barry Kelly wrote:
Frank Rizzo wrote:
>32-bit Windows 2003 R2
Mem Usage: 481,400k
Peak Mem: 583,020k
64-bit Windows 2003 R2
Mem Usage: 934,456k
Peak Mem: 1,254,008k
>Why is difference so huge? Or am I measuring the wrong metrics here?
Have you tried, e.g. SOS or a memory profiler and finding out what
instances are alive and taking up all the space?
I have not. Know of any that would work on an x64 box?
>
-- Barry
"Frank Rizzo" <no**@none.comw rote in message
news:%2******** ********@TK2MSF TNGP05.phx.gbl. ..
Hello,
I've compiled my app for AnyCPU setting in vs2005. Then I tried the app on both 32-bit
Windows 2003 R2 and 64-bit Windows 2003 R2. The memory usage of the application when
working on the same data set were unbelievable (the data is from Task Manager) :
32-bit Windows 2003 R2
Mem Usage: 481,400k
Peak Mem: 583,020k
64-bit Windows 2003 R2
Mem Usage: 934,456k
Peak Mem: 1,254,008k
In other words, basically memory usage doubled. Now I can see that the size of pointers
would double, but most of the data is of type int, short, string, etc... e.g. types that
are the same size on 32 and 64 bit machines (at least its c# aliases). The object model is
pretty big and it does have a lot of pointers to objects, but the size of the data dwarfs
the potential size of all the pointers, etc...
Why is difference so huge? Or am I measuring the wrong metrics here?
Regards
What you are looking at is the Process WorkingSet size, not the memory taken by your managed
objects.
Better use the perfmon to watch the GC memory (CLR memory) and the process memory counters.
A memory increase of 30-50% isn't that unusual, but 100% is IMO not even impossible, are you
sure you are comparing the same application using the same Framework version?
Willy.
"Willy Denoyette [MVP]" <wi************ *@telenet.bewro te in message
news:%2******** ********@TK2MSF TNGP02.phx.gbl. ..
"Frank Rizzo" <no**@none.comw rote in message
news:%2******** ********@TK2MSF TNGP05.phx.gbl. ..
>Hello,
I've compiled my app for AnyCPU setting in vs2005. Then I tried the app on both 32-bit
Windows 2003 R2 and 64-bit Windows 2003 R2. The memory usage of the application when
working on the same data set were unbelievable (the data is from Task Manager) :
32-bit Windows 2003 R2
Mem Usage: 481,400k
Peak Mem: 583,020k
64-bit Windows 2003 R2
Mem Usage: 934,456k
Peak Mem: 1,254,008k
In other words, basically memory usage doubled. Now I can see that the size of pointers
would double, but most of the data is of type int, short, string, etc... e.g. types that
are the same size on 32 and 64 bit machines (at least its c# aliases). The object model
is pretty big and it does have a lot of pointers to objects, but the size of the data
dwarfs the potential size of all the pointers, etc...
Why is difference so huge? Or am I measuring the wrong metrics here?
Regards
What you are looking at is the Process WorkingSet size, not the memory taken by your
managed objects.
Better use the perfmon to watch the GC memory (CLR memory) and the process memory
counters.
A memory increase of 30-50% isn't that unusual, but 100% is IMO not even impossible, are
you sure you are comparing the same application using the same Framework version?
Willy.
Sorry, this: ... but 100% is IMO not even impossible, ...
should read:
but 100% is IMO even impossible, ...
Note, that there is quite a difference between the JIT32 and the JIT64, and the GC behavior
and generational thresholds are also quite different too. My guess is this application is
using the Server GC on a multi-proc machine, that means that you have several GC heaps . The
space taken by the application code (native run-time libraries, JITted code, CLR stuff
etc..) account for a space increase of ~30%, the size increase of the objects in the GC
heap, depend highly on the number of objects and the number of references (pointer size!)
used as members.
Willy.
Sorry, this: ... but 100% is IMO not even impossible, ...
should read:
but 100% is IMO even impossible, ...
Note, that there is quite a difference between the JIT32 and the JIT64,
and the GC behavior and generational thresholds are also quite different
too. My guess is this application is using the Server GC on a multi-proc
machine, that means that you have several GC heaps . The space taken by
the application code (native run-time libraries, JITted code, CLR stuff
etc..) account for a space increase of ~30%, the size increase of the
objects in the GC heap, depend highly on the number of objects and the
number of references (pointer size!) used as members.
ok, I'll repeat the test with the perfmon counters you suggested and
will report back.
Frank Rizzo wrote:
Have you tried, e.g. SOS or a memory profiler and finding out what
instances are alive and taking up all the space?
I have not. Know of any that would work on an x64 box?
WinDbg & SOS should work. E.g. see: http://blogs.msdn.com/ricom/archive/...10/279612.aspx
There should be an SOS.dll for the 64-bit framework. WinDbg has versions
for Itanium, x64 etc. Google for WinDbg and you'll find it.
-- Barry
-- http://barrkel.blogspot.com/
>What you are looking at is the Process WorkingSet size, not the memory
>taken by your managed objects.
Better use the perfmon to watch the GC memory (CLR memory) and the
process memory counters.
A memory increase of 30-50% isn't that unusual, but 100% is IMO not
even impossible, are you sure you are comparing the same application
using the same Framework version?
Willy, specifically, which counters should I be looking at?
Regards
"Frank Rizzo" <no**@none.comw rote in message
news:%2******** ********@TK2MSF TNGP02.phx.gbl. ..
>>What you are looking at is the Process WorkingSet size, not the memory taken by your
managed objects.
Better use the perfmon to watch the GC memory (CLR memory) and the process memory
counters.
A memory increase of 30-50% isn't that unusual, but 100% is IMO not even impossible, are
you sure you are comparing the same application using the same Framework version?
Willy, specifically, which counters should I be looking at?
Regards
Start with:
CLR memory counters - #Bytes in all heaps and the Large Object Heap.
and
Process memory counters - Private Byes and Working Set.
Willy.
Willy wrote:
>Sorry, this: ... but 100% is IMO not even impossible, ...
should read:
but 100% is IMO even impossible, ...
Note, that there is quite a difference between the JIT32 and the
JIT64, and the GC behavior and generational thresholds are also quite
different too. My guess is this application is using the Server GC on
a multi-proc machine, that means that you have several GC heaps . The
space taken by the application code (native run-time libraries, JITted
code, CLR stuff etc..) account for a space increase of ~30%, the size
increase of the objects in the GC heap, depend highly on the number of
objects and the number of references (pointer size!) used as members.
ok, I'll repeat the test with the perfmon counters you suggested and
will report back.
Ok, I tested with perfmon as you suggested and the results aren't
better. The counters were all setup per application and all the numbers
are averages (btw, the number barely deviated from the average anyway)
64-bit:
..NET CLR Memory/#Bytes in all Heaps - 1,420,730,503
Process/Private Bytes - 1,524,000,000
..NET CLR LocksAndThreads/# of current logical threads - 9
32-bit:
..NET CLR Memory/#Bytes in all Heaps - 830,413,699
Process/Private Bytes - 781,433,124
..NET CLR LocksAndThreads/# of current logical threads - 9
The last counter is there to make sure that the thread stacks aren't
leaking.
So, as you can see, on the 64-bit end of things, the memory usage is
basically doubled. Is this right? I'll try and use WinDbg next (once I
learn it) and see what else can be uncovered. The numbers basically
didn't change over a long period of time, suggesting that there are no
memory leaks.
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