Re: HELP: Number of CPU cores is not right
On Sat, 18 Jun 2011 21:57:28 -0500, Ron Johnson wrote: On 06/18/2011 05:21 AM, Camaleón wrote: Ah, found this thread: Debian stock kernel config -- CONFIG_NR_CPUS=32? http://lists.debian.org/debian-user/2010/10/msg01391.html Oops, no rationale then :-) I hardly call module size blows up to be no rationale for limiting the number of CPUs. Well, if now is set to 512, the problem was not that big, I mean... solvable. Why 32? Well, it's a nice power of 2 and lots more than the number of cores in 99.% of all computers. That seems not to be a very practical approach to base such decision. Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2011.06.19.10.49...@gmail.com
Re: HELP: Number of CPU cores is not right
I hardly call module size blows up to be no rationale for limiting the number of CPUs. Well, if now is set to 512, the problem was not that big, I mean... solvable. IIRC the Linux kernel handling of CONFIG_NR_CPUS has changed: it used to allocate potentially large static data of size proportional to CONFIG_NR_CPUS, but has been changed recently to do that dynamically based on the actual number of CPUs. Which is why the default can now be set to 512 without suffering from undue blow up. Why 32? Well, it's a nice power of 2 and lots more than the number of cores in 99.% of all computers. That seems not to be a very practical approach to base such decision. On the contrary, it seems eminently practical. Stefan -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/jwvei2pkqon.fsf-monnier+gmane.linux.debian.u...@gnu.org
Re: HELP: Number of CPU cores is not right
On Fri, 17 Jun 2011 20:49:41 +0200, Armin Kneip wrote: The computer OS running has 48-core CPU, but the OS now only can recognize 32-core of CPU. The kernel version is 2.6.26-2-amd64. The current Debian kernel supports only 32 cpu's. Set CONFIG_NR_CPUS to 48 or higher and recompile your kernel. True! :-o sm01@stt008:~$ grep -i nr_cpus /boot/config-2.6.26-2-amd64 CONFIG_NR_CPUS=32 Where is that limit coming from? It must be a rationale for doing it so. (searching...) Ah, found this thread: Debian stock kernel config -- CONFIG_NR_CPUS=32? http://lists.debian.org/debian-user/2010/10/msg01391.html Oops, no rationale then :-) Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2011.06.18.10.21...@gmail.com
Re: HELP: Number of CPU cores is not right
On 06/18/2011 05:21 AM, Camaleón wrote: On Fri, 17 Jun 2011 20:49:41 +0200, Armin Kneip wrote: The computer OS running has 48-core CPU, but the OS now only can recognize 32-core of CPU. The kernel version is 2.6.26-2-amd64. The current Debian kernel supports only 32 cpu's. Set CONFIG_NR_CPUS to 48 or higher and recompile your kernel. True! :-o sm01@stt008:~$ grep -i nr_cpus /boot/config-2.6.26-2-amd64 CONFIG_NR_CPUS=32 Where is that limit coming from? It must be a rationale for doing it so. (searching...) Ah, found this thread: Debian stock kernel config -- CONFIG_NR_CPUS=32? http://lists.debian.org/debian-user/2010/10/msg01391.html Oops, no rationale then :-) I hardly call module size blows up to be no rationale for limiting the number of CPUs. Why 32? Well, it's a nice power of 2 and lots more than the number of cores in 99.% of all computers. -- Neither the wisest constitution nor the wisest laws will secure the liberty and happiness of a people whose manners are universally corrupt. Samuel Adams, essay in The Public Advertiser, 1749 -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/4dfd6598.2000...@cox.net
HELP: Number of CPU cores is not right
Hi all, Now I have one more problem is that the OS cannot recognize the right number of CPU Cores. The OS is Debian_5.0.8_amd64. The computer OS running has 48-core CPU, but the OS now only can recognize 32-core of CPU. The kernel version is 2.6.26-2-amd64. I tried to update the version of the kernel, but failed. So could anyone give me some advice to fix this? Thanks! Best Junjie On Fri, Jun 17, 2011 at 11:12 AM, Junjie QIAN qjj1...@gmail.com wrote: Hi all, I am a new user of Debian OS, and I am running a simulator on Debian 5.0.8-amd64 OS. The problem I encounter is that when I execute apt-get install libboost1.35-dev libboost-system1.35-dev , and the result shows that Couldn't find package libboost1.35-dev, libboost-system1.35-dev. I have tried add some new address to /etc/apt/sources/list. (deb http://http.us.debian.org/debian stable main contrib non-free deb http://non-us.debian.org/debian-non-US stable/non-US main contrib non-free deb http://security.debian.org stable/updates main contrib non-free # Uncomment if you want the apt-get source function to work #deb-src http://http.us.debian.org/debian stable main contrib non-free #deb-src http://non-us.debian.org/debian-non-US stable/non-US main contrib non-free). But it doesnot work. Any idea about this? Thanks! Best Junjie -- Junjie QIAN/钱俊杰
Re: HELP: Number of CPU cores is not right
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi, The computer OS running has 48-core CPU, but the OS now only can recognize 32-core of CPU. The kernel version is 2.6.26-2-amd64. The current Debian kernel supports only 32 cpu's. Set CONFIG_NR_CPUS to 48 or higher and recompile your kernel. Regards, Armin Kneip -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBAgAGBQJN+6HAAAoJEHWfTapWPAmcyawP/jAJMWv6l3JErFo4OJ5QVX3V ZsrjsnwsboANP3SS9xGEVSXBN/H+sHjYBuljr6WNDs75A9jjQuTgGkUunUAW8a4T MHgjccEEwJ9fR8KRzZqDJ/ozGFoZTDuAJNN7qnYczb/F9T9aWPMf0r2dqt1k/IRl 6PGwhvqa2/OqtGUq1DPbt0WE/J4HDK8+hXHVtWKw3kItADkYfOKHUyDJBqJaZ4et fexPJK1BreFrRpGE0odfN/6TLxxJY/54ZAcwEwUvM4cGBD5rY/F7Yb7H6lwzypKY fvLBLLQWbRfak0UhS1LWVUWE4fnDiQf1/4G8oG2JAHIcSP0rrnQzgLaptXDA2+Yr WtgsoOIORanbktzUT/6vT/BwtywM2LIPtHQhVgEGVzY9Eq46GDJWYpQx0zpI/ROv g61DGc0qffzNwGEaVFSMEpfOKiVjfZxHkEuAdS+1pm3JTf2EJ+2i+Uarwg0a56JW 2sMxIpejJ0+nWVP8qjlu6usaKKi8x9rdTy+qYnt3U4FQ8tI4wl5zypHx5XGpmdXI T26Bstp16e7KAqGkXyBKyGxDVjGuaTFkqv7qsHjUnjzF0m5O+Yub1cIbZIFT/idl aZvlgglVnzxI4Nm2+NNyQTfCu7zaDMvMCyyUtEYP0S/aY/6US1TpGuzEaaz4DHOO z7Z/IhGgmkyf41wsYjLB =pwSp -END PGP SIGNATURE- -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/4dfba1c5.7060...@kneip.me
Re: HELP: Number of CPU cores is not right
On Friday 17 June 2011 19:22:44 Junjie QIAN wrote: I tried to update the version of the kernel, but failed. To update it you will need to get the kernel from lenny backports. http://linux.koolsolutions.com/2009/02/20/debian-lenny-backports/ I remain puzzled, and would be grateful if someone could explain to me, as to how you are updating from Squeeze (= stable, Debian 6) and running Lenny (= old-stable, Debian 5). Lisi -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/201106172017.46303.lisi.re...@gmail.com
Re: HELP: Number of CPU cores is not right
Hi all, Now I have one more problem is that the OS cannot recognize the right number of CPU Cores. The OS is Debian_5.0.8_amd64. The computer OS running has 48-core CPU, but the OS now only can recognize 32-core of CPU. The kernel version is 2.6.26-2-amd64. I tried to update the version of the kernel, but failed. Not sure what you mean here, but if you upgrade the whole business to squeeze, you will solve your problem. The issue is that the Debian stock kernel is compiled with a maximum CPU number of 32 in lenny, but 512 in 64-bit squeeze. Alternatively, you can rebuild your own kernel, starting with the default config file but changing CONFIG_NR_CPUS to 48 or more. -- A. -- Andrew Reid / rei...@bellatlantic.net -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/201106171901.14569.rei...@bellatlantic.net
