Looking for workaround for 32 cpu limitation using GetProcessAffinityMask in 32 bit process
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 '18 at 16:30
David Heffernan
517k348181210
asked Nov 19 '18 at 16:23
Atak_SnajperaAtak_Snajpera
258211
|
show 5 more comments
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 '18 at 16:30
David Heffernan
517k348181210
asked Nov 19 '18 at 16:23
Atak_SnajperaAtak_Snajpera
258211
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 '18 at 16:32
@DavidHeffernan, wouldn'tSetThreadGroupAffinity()solve that problem? ;)
– whosrdaddy
Nov 19 '18 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 '18 at 16:37
This might by interesting.
– Jabberwocky
Nov 19 '18 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 '18 at 16:41
|
show 5 more comments
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 '18 at 16:30
David Heffernan
517k348181210
asked Nov 19 '18 at 16:23
Atak_SnajperaAtak_Snajpera
258211
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 '18 at 16:30
David Heffernan
517k348181210
asked Nov 19 '18 at 16:23
Atak_SnajperaAtak_Snajpera
258211
edited Nov 19 '18 at 16:30
David Heffernan
517k348181210
asked Nov 19 '18 at 16:23
Atak_SnajperaAtak_Snajpera
258211
edited Nov 19 '18 at 16:30
David Heffernan
517k348181210
edited Nov 19 '18 at 16:30
David Heffernan
517k348181210
edited Nov 19 '18 at 16:30
David Heffernan
517k348181210
517k348181210
asked Nov 19 '18 at 16:23
Atak_SnajperaAtak_Snajpera
258211
asked Nov 19 '18 at 16:23
Atak_SnajperaAtak_Snajpera
258211
asked Nov 19 '18 at 16:23
Atak_SnajperaAtak_Snajpera
258211
258211
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 '18 at 16:32
@DavidHeffernan, wouldn'tSetThreadGroupAffinity()solve that problem? ;)
– whosrdaddy
Nov 19 '18 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 '18 at 16:37
This might by interesting.
– Jabberwocky
Nov 19 '18 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 '18 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 '18 at 16:32
@DavidHeffernan, wouldn'tSetThreadGroupAffinity()solve that problem? ;)
– whosrdaddy
Nov 19 '18 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 '18 at 16:37
This might by interesting.
– Jabberwocky
Nov 19 '18 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 '18 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 '18 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 '18 at 16:32
@DavidHeffernan, wouldn't
SetThreadGroupAffinity() solve that problem? ;)– whosrdaddy
Nov 19 '18 at 16:36
@DavidHeffernan, wouldn't
SetThreadGroupAffinity() solve that problem? ;)– whosrdaddy
Nov 19 '18 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 '18 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 '18 at 16:37
This might by interesting.
– Jabberwocky
Nov 19 '18 at 16:39
This might by interesting.
– Jabberwocky
Nov 19 '18 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 '18 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 '18 at 16:41
|
show 5 more comments
1 Answer
1
active
oldest
votes
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 '18 at 17:01
David HeffernanDavid Heffernan
517k348181210
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53378828%2flooking-for-workaround-for-32-cpu-limitation-using-getprocessaffinitymask-in-32%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
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 '18 at 17:01
David HeffernanDavid Heffernan
517k348181210
add a comment |
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 '18 at 17:01
David HeffernanDavid Heffernan
517k348181210
add a comment |
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 '18 at 17:01
David HeffernanDavid Heffernan
517k348181210
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 '18 at 17:01
David HeffernanDavid Heffernan
517k348181210
answered Nov 19 '18 at 17:01
David HeffernanDavid Heffernan
517k348181210
answered Nov 19 '18 at 17:01
David HeffernanDavid Heffernan
517k348181210
answered Nov 19 '18 at 17:01
David HeffernanDavid Heffernan
517k348181210
517k348181210
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53378828%2flooking-for-workaround-for-32-cpu-limitation-using-getprocessaffinitymask-in-32%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
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 '18 at 16:32
@DavidHeffernan, wouldn't
SetThreadGroupAffinity()solve that problem? ;)– whosrdaddy
Nov 19 '18 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 '18 at 16:37
This might by interesting.
– Jabberwocky
Nov 19 '18 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 '18 at 16:41