Looking for workaround for 32 cpu limitation using GetProcessAffinityMask in 32 bit process
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I've just realized that GetProcessAffinityMask can't return values larger than 4'294'967'295 (1111 1111 1111 1111 1111 1111 1111 1111) in 32 bit applications, even on a 64 bit system.
This means that I'm unable to correctly detect system affinity mask on machines with more than 32 logical processors. Is there any hack to get other half of the affinity mask in this case?
winapi
edited Nov 19 at 16:30
David Heffernan
513k338111204
asked Nov 19 at 16:23
Atak_Snajpera
256211
|
show 5 more comments
up vote
-1
down vote
favorite
I've just realized that GetProcessAffinityMask can't return values larger than 4'294'967'295 (1111 1111 1111 1111 1111 1111 1111 1111) in 32 bit applications, even on a 64 bit system.
This means that I'm unable to correctly detect system affinity mask on machines with more than 32 logical processors. Is there any hack to get other half of the affinity mask in this case?
winapi
edited Nov 19 at 16:30
David Heffernan
513k338111204
asked Nov 19 at 16:23
Atak_Snajpera
256211
Even in a 64 bit process (that being the obvious way to try to solve the problem) you come unstuck when there are more than 64 processors. What do you propose to do then?
– David Heffernan
Nov 19 at 16:32
@DavidHeffernan, wouldn'tSetThreadGroupAffinity()solve that problem? ;)
– whosrdaddy
Nov 19 at 16:36
@DavidHeffernan Max cpu group size in windows is 64 so if you have more logical cpus then OS will create "fake" numa nodes.
– Atak_Snajpera
Nov 19 at 16:37
This might by interesting.
– Jabberwocky
Nov 19 at 16:39
Yes, I know that, I was wondering whether you were aware of the issue. If you have a multi group process thenGetProcessAffinityMaskreturns zero for both masks. I suppose my real point is thatGetProcessAffinityMaskbecomes much less useful on such machines because of these issues. So perhaps even if you can succeed in getting the info (e.g. via a 64 bit process) then it may not do you any real good. When I need this information, I callGetLogicalProcessorInformationEx.
– David Heffernan
Nov 19 at 16:41
|
show 5 more comments
up vote
-1
down vote
favorite
up vote
-1
down vote
favorite
I've just realized that GetProcessAffinityMask can't return values larger than 4'294'967'295 (1111 1111 1111 1111 1111 1111 1111 1111) in 32 bit applications, even on a 64 bit system.
This means that I'm unable to correctly detect system affinity mask on machines with more than 32 logical processors. Is there any hack to get other half of the affinity mask in this case?
winapi
edited Nov 19 at 16:30
David Heffernan
513k338111204
asked Nov 19 at 16:23
Atak_Snajpera
256211
I've just realized that GetProcessAffinityMask can't return values larger than 4'294'967'295 (1111 1111 1111 1111 1111 1111 1111 1111) in 32 bit applications, even on a 64 bit system.
This means that I'm unable to correctly detect system affinity mask on machines with more than 32 logical processors. Is there any hack to get other half of the affinity mask in this case?
winapi
winapi
edited Nov 19 at 16:30
David Heffernan
513k338111204
asked Nov 19 at 16:23
Atak_Snajpera
256211
edited Nov 19 at 16:30
David Heffernan
513k338111204
asked Nov 19 at 16:23
Atak_Snajpera
256211
edited Nov 19 at 16:30
David Heffernan
513k338111204
edited Nov 19 at 16:30
David Heffernan
513k338111204
edited Nov 19 at 16:30
David Heffernan
513k338111204
513k338111204
asked Nov 19 at 16:23
Atak_Snajpera
256211
asked Nov 19 at 16:23
Atak_Snajpera
256211
asked Nov 19 at 16:23
Atak_Snajpera
256211
256211
Even in a 64 bit process (that being the obvious way to try to solve the problem) you come unstuck when there are more than 64 processors. What do you propose to do then?
– David Heffernan
Nov 19 at 16:32
@DavidHeffernan, wouldn'tSetThreadGroupAffinity()solve that problem? ;)
– whosrdaddy
Nov 19 at 16:36
@DavidHeffernan Max cpu group size in windows is 64 so if you have more logical cpus then OS will create "fake" numa nodes.
– Atak_Snajpera
Nov 19 at 16:37
This might by interesting.
– Jabberwocky
Nov 19 at 16:39
Yes, I know that, I was wondering whether you were aware of the issue. If you have a multi group process thenGetProcessAffinityMaskreturns zero for both masks. I suppose my real point is thatGetProcessAffinityMaskbecomes much less useful on such machines because of these issues. So perhaps even if you can succeed in getting the info (e.g. via a 64 bit process) then it may not do you any real good. When I need this information, I callGetLogicalProcessorInformationEx.
– David Heffernan
Nov 19 at 16:41
|
show 5 more comments
Even in a 64 bit process (that being the obvious way to try to solve the problem) you come unstuck when there are more than 64 processors. What do you propose to do then?
– David Heffernan
Nov 19 at 16:32
@DavidHeffernan, wouldn'tSetThreadGroupAffinity()solve that problem? ;)
– whosrdaddy
Nov 19 at 16:36
@DavidHeffernan Max cpu group size in windows is 64 so if you have more logical cpus then OS will create "fake" numa nodes.
– Atak_Snajpera
Nov 19 at 16:37
This might by interesting.
– Jabberwocky
Nov 19 at 16:39
Yes, I know that, I was wondering whether you were aware of the issue. If you have a multi group process thenGetProcessAffinityMaskreturns zero for both masks. I suppose my real point is thatGetProcessAffinityMaskbecomes much less useful on such machines because of these issues. So perhaps even if you can succeed in getting the info (e.g. via a 64 bit process) then it may not do you any real good. When I need this information, I callGetLogicalProcessorInformationEx.
– David Heffernan
Nov 19 at 16:41
Even in a 64 bit process (that being the obvious way to try to solve the problem) you come unstuck when there are more than 64 processors. What do you propose to do then?
– David Heffernan
Nov 19 at 16:32
Even in a 64 bit process (that being the obvious way to try to solve the problem) you come unstuck when there are more than 64 processors. What do you propose to do then?
– David Heffernan
Nov 19 at 16:32
@DavidHeffernan, wouldn't
SetThreadGroupAffinity() solve that problem? ;)– whosrdaddy
Nov 19 at 16:36
@DavidHeffernan, wouldn't
SetThreadGroupAffinity() solve that problem? ;)– whosrdaddy
Nov 19 at 16:36
@DavidHeffernan Max cpu group size in windows is 64 so if you have more logical cpus then OS will create "fake" numa nodes.
– Atak_Snajpera
Nov 19 at 16:37
@DavidHeffernan Max cpu group size in windows is 64 so if you have more logical cpus then OS will create "fake" numa nodes.
– Atak_Snajpera
Nov 19 at 16:37
This might by interesting.
– Jabberwocky
Nov 19 at 16:39
This might by interesting.
– Jabberwocky
Nov 19 at 16:39
Yes, I know that, I was wondering whether you were aware of the issue. If you have a multi group process then
GetProcessAffinityMask returns zero for both masks. I suppose my real point is that GetProcessAffinityMask becomes much less useful on such machines because of these issues. So perhaps even if you can succeed in getting the info (e.g. via a 64 bit process) then it may not do you any real good. When I need this information, I call GetLogicalProcessorInformationEx.– David Heffernan
Nov 19 at 16:41
Yes, I know that, I was wondering whether you were aware of the issue. If you have a multi group process then
GetProcessAffinityMask returns zero for both masks. I suppose my real point is that GetProcessAffinityMask becomes much less useful on such machines because of these issues. So perhaps even if you can succeed in getting the info (e.g. via a 64 bit process) then it may not do you any real good. When I need this information, I call GetLogicalProcessorInformationEx.– David Heffernan
Nov 19 at 16:41
|
show 5 more comments
1 Answer
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The supported way to do this is to use a 64 bit process.
If you are unable to covert your application to 64 bit then create and call a small helper process to do the work, and pass the information back to your 32 bit application.
answered Nov 19 at 17:01
David Heffernan
513k338111204
add a comment |
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1 Answer
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The supported way to do this is to use a 64 bit process.
If you are unable to covert your application to 64 bit then create and call a small helper process to do the work, and pass the information back to your 32 bit application.
answered Nov 19 at 17:01
David Heffernan
513k338111204
add a comment |
up vote
1
down vote
The supported way to do this is to use a 64 bit process.
If you are unable to covert your application to 64 bit then create and call a small helper process to do the work, and pass the information back to your 32 bit application.
answered Nov 19 at 17:01
David Heffernan
513k338111204
add a comment |
up vote
1
down vote
up vote
1
down vote
The supported way to do this is to use a 64 bit process.
If you are unable to covert your application to 64 bit then create and call a small helper process to do the work, and pass the information back to your 32 bit application.
answered Nov 19 at 17:01
David Heffernan
513k338111204
The supported way to do this is to use a 64 bit process.
If you are unable to covert your application to 64 bit then create and call a small helper process to do the work, and pass the information back to your 32 bit application.
answered Nov 19 at 17:01
David Heffernan
513k338111204
answered Nov 19 at 17:01
David Heffernan
513k338111204
answered Nov 19 at 17:01
David Heffernan
513k338111204
answered Nov 19 at 17:01
David Heffernan
513k338111204
513k338111204
add a comment |
add a comment |
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Even in a 64 bit process (that being the obvious way to try to solve the problem) you come unstuck when there are more than 64 processors. What do you propose to do then?
– David Heffernan
Nov 19 at 16:32
@DavidHeffernan, wouldn't
SetThreadGroupAffinity()solve that problem? ;)– whosrdaddy
Nov 19 at 16:36
@DavidHeffernan Max cpu group size in windows is 64 so if you have more logical cpus then OS will create "fake" numa nodes.
– Atak_Snajpera
Nov 19 at 16:37
This might by interesting.
– Jabberwocky
Nov 19 at 16:39
Yes, I know that, I was wondering whether you were aware of the issue. If you have a multi group process then
GetProcessAffinityMaskreturns zero for both masks. I suppose my real point is thatGetProcessAffinityMaskbecomes much less useful on such machines because of these issues. So perhaps even if you can succeed in getting the info (e.g. via a 64 bit process) then it may not do you any real good. When I need this information, I callGetLogicalProcessorInformationEx.– David Heffernan
Nov 19 at 16:41